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 <front>
  <journal-meta>
   <journal-id journal-id-type="publisher-id">Russian Journal of Earth Sciences</journal-id>
   <journal-title-group>
    <journal-title xml:lang="en">Russian Journal of Earth Sciences</journal-title>
    <trans-title-group xml:lang="ru">
     <trans-title>Russian Journal of Earth Sciences</trans-title>
    </trans-title-group>
   </journal-title-group>
   <issn publication-format="online">1681-1208</issn>
  </journal-meta>
  <article-meta>
   <article-id pub-id-type="publisher-id">57013</article-id>
   <article-id pub-id-type="doi">10.2205/2023es000843</article-id>
   <article-categories>
    <subj-group subj-group-type="toc-heading" xml:lang="ru">
     <subject>ОРИГИНАЛЬНЫЕ СТАТЬИ</subject>
    </subj-group>
    <subj-group subj-group-type="toc-heading" xml:lang="en">
     <subject>ORIGINAL ARTICLES</subject>
    </subj-group>
    <subj-group>
     <subject>ОРИГИНАЛЬНЫЕ СТАТЬИ</subject>
    </subj-group>
   </article-categories>
   <title-group>
    <article-title xml:lang="en">Modern Low-Magnitude Earthquake Swarms of the Gakkel Mid-Oceanic Ridge, Arctic Ocean</article-title>
    <trans-title-group xml:lang="ru">
     <trans-title>Современная группирующаяся низкомагнитудная сейсмичность срединно-океанического хребта Гаккеля</trans-title>
    </trans-title-group>
   </title-group>
   <contrib-group content-type="authors">
    <contrib contrib-type="author">
     <contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9958-5974</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Морозов</surname>
       <given-names>Алексей Николаевич</given-names>
      </name>
      <name xml:lang="en">
       <surname>Morozov</surname>
       <given-names>Aleksey Nikolaevich</given-names>
      </name>
     </name-alternatives>
     <email>morozovalexey@yandex.ru</email>
     <xref ref-type="aff" rid="aff-1"/>
     <xref ref-type="aff" rid="aff-2"/>
     <xref ref-type="aff" rid="aff-3"/>
    </contrib>
    <contrib contrib-type="author">
     <contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5007-8311</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Ваганова</surname>
       <given-names>Наталья Владиславовна</given-names>
      </name>
      <name xml:lang="en">
       <surname>Vaganova</surname>
       <given-names>Natalia Vladislavovna</given-names>
      </name>
     </name-alternatives>
     <bio xml:lang="ru">
      <p>кандидат геолого-минералогических наук;</p>
     </bio>
     <bio xml:lang="en">
      <p>candidate of geological and mineralogical sciences;</p>
     </bio>
     <xref ref-type="aff" rid="aff-4"/>
    </contrib>
    <contrib contrib-type="author">
     <contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6567-6357</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Старков</surname>
       <given-names>Иван Владимирович</given-names>
      </name>
      <name xml:lang="en">
       <surname>Starkov</surname>
       <given-names>Ivan Vladimirovich</given-names>
      </name>
     </name-alternatives>
     <xref ref-type="aff" rid="aff-5"/>
    </contrib>
    <contrib contrib-type="author">
     <contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6600-1220</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Михайлова</surname>
       <given-names>Яна Александровна</given-names>
      </name>
      <name xml:lang="en">
       <surname>Mikhaylova</surname>
       <given-names>Yana Aleksandrovna</given-names>
      </name>
     </name-alternatives>
     <email>mikhailovayana@gmail.com</email>
     <xref ref-type="aff" rid="aff-6"/>
    </contrib>
   </contrib-group>
   <aff-alternatives id="aff-1">
    <aff>
     <institution xml:lang="ru">Институт физики Земли им. О.Ю. Шмидта РАН</institution>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences</institution>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-2">
    <aff>
     <institution xml:lang="ru">Геофизический центр Российской Академии Наук</institution>
     <country>RU</country>
    </aff>
    <aff>
     <institution xml:lang="en">Geophysical Center of the Russian Academy of Sciences</institution>
     <country>RU</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-3">
    <aff>
     <institution xml:lang="ru">Федеральный исследовательский центр комплексного изучения Арктики имени академика Н. П. Лаверова Уральского отделения Российской академии наук</institution>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences</institution>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-4">
    <aff>
     <institution xml:lang="ru">Федеральный исследовательский центр комплексного изучения Арктики имени академика Н. П. Лаверова Уральского отделения Российской академии наук</institution>
     <city>Архангельск</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences</institution>
     <city>Архангельск</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-5">
    <aff>
     <institution xml:lang="ru">Федеральный исследовательский центр комплексного изучения Арктики имени академика Н. П. Лаверова Уральского отделения Российской академии наук</institution>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">Federal Research Center for Integrated Study of the Arctic named after Academician N.P. Laverov, Ural Branch of the Russian Academy of Sciences</institution>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-6">
    <aff>
     <institution xml:lang="ru">Федеральный исследовательский центр комплексного изучения Арктики имени академика Н. П. Лаверова Уральского отделения Российской академии наук</institution>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences</institution>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <pub-date publication-format="print" date-type="pub" iso-8601-date="2023-08-22T00:00:00+03:00">
    <day>22</day>
    <month>08</month>
    <year>2023</year>
   </pub-date>
   <pub-date publication-format="electronic" date-type="pub" iso-8601-date="2023-08-22T00:00:00+03:00">
    <day>22</day>
    <month>08</month>
    <year>2023</year>
   </pub-date>
   <volume>23</volume>
   <issue>3</issue>
   <fpage>1</fpage>
   <lpage>16</lpage>
   <history>
    <date date-type="received" iso-8601-date="2023-01-31T00:00:00+03:00">
     <day>31</day>
     <month>01</month>
     <year>2023</year>
    </date>
    <date date-type="accepted" iso-8601-date="2023-04-05T00:00:00+03:00">
     <day>05</day>
     <month>04</month>
     <year>2023</year>
    </date>
   </history>
   <self-uri xlink:href="https://rjes.ru/en/nauka/article/57013/view">https://rjes.ru/en/nauka/article/57013/view</self-uri>
   <abstract xml:lang="ru">
    <p>Землетрясения на срединно-океанических хребтах (СОХ) отражают активные магматические и тектонические процессы, формирующие новую океаническую кору. При этом, активные процессы спрединга ультрамедленных хребтов, со скоростями спрединга менее 20 мм/год, к которым относятся хребет Гаккеля в Северном Ледовитом океане и юго-западный Индийский в Индийском океане, ещё слабо изучены по сравнению с СОХ в Атлантическом и Тихом океанах, со скоростями спрединга более 25 мм/год. Благодаря установке в XXI веке стационарных сейсмических станций на арктических архипелагах Земля Франца-Иосифа и Северная Земля, появилась возможность регистрировать и изучать в пределах хребта Гаккеля низкомагнитудные группирующиеся землетрясения, в том числе роевые последовательности землетрясений. В данной статье представлены первые результаты регистрации, локации и изучения роевых последовательностей низкомагнитудных землетрясений в пределах хребта Гаккеля за период с 2012 по 2022 гг. Показано, что роевые последовательности в большей степени регистрируются в западном вулканическом и восточном вулканическом сегментах хребта, а в пределах центрального амагматического сегмента таковых не обнаружено. В структурообразованииэтой части хребта преобладают тектонические, а не магматические и метаморфические процессы. Подробно рассмотрены два крупных роя низкомагнитудных землетрясений в восточном вулканическом сегменте хребта.</p>
   </abstract>
   <trans-abstract xml:lang="en">
    <p>Earthquakes at mid-ocean ridges (MOR) reflect the active magmatic and tectonic processes that form new oceanic crust. Active spreading processes of ultraslow ridges, with spreading rates of less than 20 mm/yr, are still poorly understood compared to the MOR in the Atlantic and Pacific oceans, with spreading rates of more than 25 mm/yr. Thanks to the installation of stationary seismic stations in the 21st century on the Arctic archipelagos of Franz Josef Land and Severnaya Zemlya, it became possible to record and study low-magnitude grouping earthquakes within the Gakkel Ridge, including swarm sequences of earthquakes. This article presents the first results of registration, location and study of swarm sequences of low-magnitude earthquakes within the Gakkel Ridge for the period from 2012 to 2022. It is shown that swarm sequences are recorded to a greater extent in the western volcanic and eastern volcanic segments of the ridge, while no such sequences were found within the central amagmatic segment. The structure formation of this part of the ridge is dominated by tectonic rather than magmatic and metamorphic processes. Two large swarm of low-magnitude earthquakes that occurred in the eastern volcanic segment of the ridge are considered in detail.</p>
   </trans-abstract>
   <kwd-group xml:lang="ru">
    <kwd>Арктика</kwd>
    <kwd>хребет Гаккеля</kwd>
    <kwd>низкомагнитудные землетрясения</kwd>
    <kwd>рой землетрясений</kwd>
   </kwd-group>
   <kwd-group xml:lang="en">
    <kwd>Gakkel Ridge</kwd>
    <kwd>low-magnitude earthquakes</kwd>
    <kwd>Arctic</kwd>
    <kwd>earthquake swarm</kwd>
    <kwd>Arctic Ocean</kwd>
   </kwd-group>
   <funding-group>
    <funding-statement xml:lang="ru">Исследования выполнены при финансовой поддержке гранта РНФ № 22-27-00190 «Рои низкомагнитудных землетрясений на ультрамедленном спрединговом хребте Гаккеля в Арктике – индикатор современного магматизма и внедрения даек?»</funding-statement>
    <funding-statement xml:lang="en">The research was supported by the Russian Science Foundation, grant no. 22-27-00190 (“Are swarms of lowmagnitude earthquakes on the ultraslow spreading Gakkel Ridge in the Arctic the Indicator of recent magmatism and dyke intrusions?”</funding-statement>
   </funding-group>
  </article-meta>
 </front>
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 <back>
  <ref-list>
   <ref id="B1">
    <label>1.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Аветисов Г. П. Сейсмоактивные зоны Арктики. — СПб : ВНИИОкеангеология, 1996. — С. 185.</mixed-citation>
     <mixed-citation xml:lang="en">Avetisov G. P. Seismically active zones of the Arctic. — SPb : VNIIOkeangeologiya, 1996. — P. 185. — (in Russian)</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B2">
    <label>2.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Акимов А. П., Красилов С. А. Программный комплекс WSG «Система обработки сейсмических данных». Свидетельство о государственной регистрации программы для ЭВМ No 2020664678 от 16.11.2020 г. — 2020.</mixed-citation>
     <mixed-citation xml:lang="en">Akimov A. P., Krasilov S. A. Software complex WSG “Seismic Data Processing System”. Certificate of state registration of the computer program No 2020664678 dated November 16, 2020. — 2020. — (in Russian).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B3">
    <label>3.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Гуревич В. Ю., Астафурова Н. И., Глебовский Е. Г. и др. Некоторые особенности аккреции коры у оси западной части ультранизкоскоростного хребта Гаккеля, Северный Ледовитый океан // Геолого-геофизические характеристики литосферы Арктического региона. — 2004. — Т. 5. — С. 87—97.</mixed-citation>
     <mixed-citation xml:lang="en">Gurevich V. Y., Astafurova N. I., Glebovsky E. G., et al. Some peculiarities of crustal accretion near the axis of the western part of the ultra-low velocity Gakkel Ridge, Arctic Ocean // Geological and geophysical characteristics of the lithosphere of the Arctic region. — 2004. — Vol. 5. — P. 87–97. — (in Russian).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B4">
    <label>4.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Дубинин Е. П., Кохан А. В., Сущевская Н. М. Тектоника и магматизм ультрамедленных спрединговых хребтов // Геотектоника. — 2013. — Вып. 3, № 3. — С. 3—30. — DOI: 10.7868/s0016853x13030028.</mixed-citation>
     <mixed-citation xml:lang="en">Dubinin E. P., Kokhan A. V., Sushchevskaya N. M. Tectonics and Magmatism of Ultra Slow Spreading Ridges // Geotectonics. — 2013. — Issue 3, no. 3. — P. 3–30. — DOI: 10.7868/s0016853x13030028. — (in Russian).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B5">
    <label>5.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Кохан А. В. Морфология рифтовых зон ультрамедленного спрединга (хребты Рейкьянес, Книповича и Гаккеля) // Вестник Московского университета. Серия 5: География. — 2013. — Т. 2. — С. 61—69.</mixed-citation>
     <mixed-citation xml:lang="en">Kokhan A. V. Morphology of ultra-slow spreading rift zones (Reykjanes, Knipovich and Gakkel ridges) // Bulletin of the Moscow University. Series 5: Geography. — 2013. — Vol. 2. — P. 61–69. — (in Russian).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B6">
    <label>6.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Мирзоев К. М. Рекомендации по выделению групповых землетрясений // Вопросы инженерной сейсмологии (Инженерно-сейсмологические исследования для районирования сейсмической опасности). — 1992. — Т. 33. — С. 53—57.</mixed-citation>
     <mixed-citation xml:lang="en">Mirzoev K. M. Recommendations for identifying group earthquakes // Issues of engineering seismology (Engineering and seismological research for seismic hazard zoning). — 1992. — Vol. 33. — P. 53–57. — (in Russian).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B7">
    <label>7.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Молчан Г. М., Дмитриева О. Е. Идентификация афтершоков: обзор и новые подходы // Современные методы интерпретации сейсмологических данных. Вычислительная сейсмология. Т. 24. — Москва : Наука, 1991. — С. 19—50.</mixed-citation>
     <mixed-citation xml:lang="en">Molchan G. M., Dmitrieva O. E. Aftershock Identification: Overview and New Approaches // Modern methods of interpretation of seismological data. Computational seismology. Vol. 24. — Moscow : Nauka, 1991. — P. 19–50. — (in Russian)</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B8">
    <label>8.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Морозов А. Н., Ваганова Н. В. Годографы региональных волн P и S для районов спрединговых хребтов ЕвроАрктического региона // Вулканология и сейсмология. — 2017. — № 2. — С. 59—67. — DOI: 10.7868/s0203030617020055.</mixed-citation>
     <mixed-citation xml:lang="en">Morozov A. N., Vaganova N. V. Hodographs of regional waves P and S for areas of spreading ridges in the Euro-Arctic region // Volcanology and seismology. — 2017. — No. 2. — P. 59–67. — DOI: 10.7868/s0203030617020055. — (in Russian).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B9">
    <label>9.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Морозов А. Н., Ваганова Н. В., Асминг В. Э. и др. Шкала ML для западной части Евразийской Арктики // Российский сейсмологический журнал. — 2020. — Т. 2, № 4. — С. 63—68. — DOI: 10.35540/2686-7907.2020.4.06.</mixed-citation>
     <mixed-citation xml:lang="en">Morozov A., Vaganova N., Asming V., et al. The ML scale in western Eurasian Arctic // Russian Journal of Seismology. — 2020. — Vol. 2, no. 4. — P. 63–68. — DOI: 10.35540/2686-7907.2020.4.06. — (in Russian).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B10">
    <label>10.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Рекант П. В., Гусев Е. А. Структура и история формирования осадочного чехла рифтовой зоны хребта Гаккеля (Северный Ледовитый океан) // Геология и геофизика. — 2016. — Т. 57, № 9. — С. 1634—1640. — DOI: 10.15372/gig20160903.</mixed-citation>
     <mixed-citation xml:lang="en">Rekant P. V., Gusev E. A. Structure and formation history of the sedimentary cover of the rift zone of the Gakkel Ridge (Arctic Ocean) // Russian geology and geophysics. — 2016. — Vol. 57, no. 9. — P. 1634–1640. — DOI: 10.15372/gig20160903. — (in Russian).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B11">
    <label>11.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Смирнов В. Б. Прогностические аномалии сейсмического режима. I. Методические основы подготовки исходных данных // Геофизические исследования. — 2009. — Т. 10, № 2. — С. 7—22.</mixed-citation>
     <mixed-citation xml:lang="en">Smirnov V. B. Prognostic anomalies of the seismic regime. I. Methodological basis for the preparation of initial data // Geophysical research. — 2009. — Vol. 10, no. 2. — P. 7–22. — (in Russian).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B12">
    <label>12.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Шебалин П. Н. Цепочки эпицентров как индикатор возрастания радиуса корреляции сейсмичности перед сильными землетрясениями // Вулканология и сейсмология. — 2005. — № 1. — С. 3—15.</mixed-citation>
     <mixed-citation xml:lang="en">Shebalin P. N. Epicenter chains as an indicator of increasing seismicity correlation radius before strong earthquakes // Volcanology and seismology. — 2005. — No. 1. — P. 3–15. — (in Russian).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B13">
    <label>13.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Antonovskaya G., Morozov A., Vaganova N., et al. Seismic monitoring of the European Arctic and Adjoining Regions // The Arctic. Current Issues and Challenges. — 2020. — P. 303–368.</mixed-citation>
     <mixed-citation xml:lang="en">Antonovskaya G., Morozov A., Vaganova N., et al. Seismic monitoring of the European Arctic and Adjoining Regions // The Arctic. Current Issues and Challenges. — 2020. — P. 303–368.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B14">
    <label>14.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Asming V., Prokudina A. System for automatic detection and location of seismic events for arbitrary seismic station configuration NSDL // European Seismological Commission. — 2016. — P. 2016–373.</mixed-citation>
     <mixed-citation xml:lang="en">Asming V., Prokudina A. System for automatic detection and location of seismic events for arbitrary seismic station configuration NSDL // European Seismological Commission. — 2016. — P. 2016–373.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B15">
    <label>15.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Bohnenstiehl D. R., Dziak R. P. Mid-ocean ridge seismicity // Encyclopedia of Ocean Sciences / ed. by J. Steele, S. Thorpe, K. Turekian. — London : Academic Press, 2008.</mixed-citation>
     <mixed-citation xml:lang="en">Bohnenstiehl D. R., Dziak R. P. Mid-ocean ridge seismicity // Encyclopedia of Ocean Sciences / ed. by J. Steele, S. Thorpe, K. Turekian. — London : Academic Press, 2008.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B16">
    <label>16.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Cochran J. R. Seamount volcanism along the Gakkel Ridge, Arctic Ocean // Geophysical Journal International. — 2008. — Vol. 174, no. 3. — P. 1153–1173. — DOI: 10.1111/j.1365-246x.2008.03860.x.</mixed-citation>
     <mixed-citation xml:lang="en">Cochran J. R. Seamount volcanism along the Gakkel Ridge, Arctic Ocean // Geophysical Journal International. — 2008. — Vol. 174, no. 3. — P. 1153–1173. — DOI: 10.1111/j.1365-246x.2008.03860.x.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B17">
    <label>17.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Crotwell H. P., Owens T. J., Ritsema J. The TauP Toolkit: Flexible Seismic Travel-Time and Raypath Utilities // Seismological Research Letters. — 1999. — Vol. 70, no. 2. — P. 154–160. — DOI: 10.1785/gssrl.70.2.154.</mixed-citation>
     <mixed-citation xml:lang="en">Crotwell H. P., Owens T. J., Ritsema J. The TauP Toolkit: Flexible Seismic Travel-Time and Raypath Utilities // Seismological Research Letters. — 1999. — Vol. 70, no. 2. — P. 154–160. — DOI: 10.1785/gssrl.70.2.154.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B18">
    <label>18.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Dziewonski A. M., Anderson D. L. Preliminary reference Earth model // Physics of the Earth and Planetary Interiors. — 1981. — Vol. 25, no. 4. — P. 297–356. — DOI: 10.1016/0031-9201(81)90046-7.</mixed-citation>
     <mixed-citation xml:lang="en">Dziewonski A. M., Anderson D. L. Preliminary reference Earth model // Physics of the Earth and Planetary Interiors. — 1981. — Vol. 25, no. 4. — P. 297–356. — DOI: 10.1016/0031-9201(81)90046-7.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B19">
    <label>19.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Edwards M. H., Kurras G. J., Tolstoy M., et al. Evidence of recent volcanic activity on the ultraslow-spreading Gakkel ridge // Nature. — 2001. — Vol. 409, no. 6822. — P. 808–812. — DOI: 10.1038/35057258.</mixed-citation>
     <mixed-citation xml:lang="en">Edwards M. H., Kurras G. J., Tolstoy M., et al. Evidence of recent volcanic activity on the ultraslow-spreading Gakkel ridge // Nature. — 2001. — Vol. 409, no. 6822. — P. 808–812. — DOI: 10.1038/35057258.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B20">
    <label>20.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Engen Ø., Eldholm O., Bungum H. The Arctic plate boundary // Journal of Geophysical Research: Solid Earth. — 2003. — Vol. 108, B2. — P. 1–17. — DOI: 10.1029/2002jb001809.</mixed-citation>
     <mixed-citation xml:lang="en">Engen Ø., Eldholm O., Bungum H. The Arctic plate boundary // Journal of Geophysical Research: Solid Earth. — 2003. — Vol. 108, B2. — P. 1–17. — DOI: 10.1029/2002jb001809.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B21">
    <label>21.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Fedorov A. V., Asming V. E., Jevtjugina Z. A., et al. Automated Seismic Monitoring System for the European Arctic // Seismic Instruments. — 2019. — Vol. 55, no. 1. — P. 17–23. — DOI: 10.3103/s0747923919010067.</mixed-citation>
     <mixed-citation xml:lang="en">Fedorov A. V., Asming V. E., Jevtjugina Z. A., et al. Automated Seismic Monitoring System for the European Arctic // Seismic Instruments. — 2019. — Vol. 55, no. 1. — P. 17–23. — DOI: 10.3103/s0747923919010067.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B22">
    <label>22.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Fox C. G., Radford W. E., Dziak R. P., et al. Acoustic detection of a seafloor spreading episode on the Juan de Fuca Ridge using military hydrophone arrays // Geophysical Research Letters. — 1995. — Vol. 22, no. 2. — P. 131–134. — DOI: 10.1029/94gl02059.</mixed-citation>
     <mixed-citation xml:lang="en">Fox C. G., Radford W. E., Dziak R. P., et al. Acoustic detection of a seafloor spreading episode on the Juan de Fuca Ridge using military hydrophone arrays // Geophysical Research Letters. — 1995. — Vol. 22, no. 2. — P. 131–134. — DOI: 10.1029/94gl02059.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B23">
    <label>23.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Frohlich C., Davis S. D. Single-link cluster analysis as a method to evaluate spatial and temporal properties of earthquake catalogues // Geophysical Journal International. — 1990. — Vol. 100, no. 1. — P. 19–32. — DOI: 10.1111/j.1365-246x.1990.tb04564.x.</mixed-citation>
     <mixed-citation xml:lang="en">Frohlich C., Davis S. D. Single-link cluster analysis as a method to evaluate spatial and temporal properties of earthquake catalogues // Geophysical Journal International. — 1990. — Vol. 100, no. 1. — P. 19–32. — DOI: 10.1111/j.1365-246x.1990.tb04564.x.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B24">
    <label>24.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">GEOFON. — 2014. — URL: https://geofon.gfz-potsdam.de/ (visited on 03/31/2023).</mixed-citation>
     <mixed-citation xml:lang="en">GEOFON. — 2014. — URL: https://geofon.gfz-potsdam.de/ (visited on 03/31/2023).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B25">
    <label>25.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Global CMT Catalog. — 2013. — URL: https://www.globalcmt.org/CMTsearch.html (visited on 03/31/2023).</mixed-citation>
     <mixed-citation xml:lang="en">Global CMT Catalog. — 2013. — URL: https://www.globalcmt.org/CMTsearch.html (visited on 03/31/2023).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B26">
    <label>26.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Havskov J., Bormann P., Schweitzer J. Earthquake location // New Manual of Seismological Observatory Practice (NMSOP). — Deutsches GeoForschungsZentrum GFZ, 2009. — P. 1–28.</mixed-citation>
     <mixed-citation xml:lang="en">Havskov J., Bormann P., Schweitzer J. Earthquake location // New Manual of Seismological Observatory Practice (NMSOP). — Deutsches GeoForschungsZentrum GFZ, 2009. — P. 1–28.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B27">
    <label>27.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Hess H. H. Petrologie Studies. A Volume in Honour of Buddington. — New York : The Geological Society of American, 1962. — P. 660.</mixed-citation>
     <mixed-citation xml:lang="en">Hess H. H. Petrologie Studies. A Volume in Honour of Buddington. — New York : The Geological Society of American, 1962. — P. 660.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B28">
    <label>28.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">International Seismological Centre (ISC). — 1964. — URL: http://www.isc.ac.uk/ (visited on 03/31/2023).</mixed-citation>
     <mixed-citation xml:lang="en">International Seismological Centre (ISC). — 1964. — URL: http://www.isc.ac.uk/ (visited on 03/31/2023).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B29">
    <label>29.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Kennett B. L. N. Seismological tables: ak135. — Australia, Canberra : Research School of Earth Sciences. Australian National University, 2005. — P. 289.</mixed-citation>
     <mixed-citation xml:lang="en">Kennett B. L. N. Seismological tables: ak135. — Australia, Canberra : Research School of Earth Sciences. Australian National University, 2005. — P. 289.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B30">
    <label>30.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Korger E. I. Seismicity and structure of a magmatic accretionary centre at an ultraslow spreading ridge: The volcanic centre at 85E/85N, Gakkel Ridge. — University of Bremen, 2013. — P. 159.</mixed-citation>
     <mixed-citation xml:lang="en">Korger E. I. Seismicity and structure of a magmatic accretionary centre at an ultraslow spreading ridge: The volcanic centre at 85E/85N, Gakkel Ridge. — University of Bremen, 2013. — P. 159.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B31">
    <label>31.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Maus S., Barckhausen U., Berkenbosch H., et al. EMAG2: A 2–arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements // Geochemistry, Geophysics, Geosystems. — 2009. — Vol. 10, no. 8. — P. 08005. — DOI: 10.1029/2009gc002471.</mixed-citation>
     <mixed-citation xml:lang="en">Maus S., Barckhausen U., Berkenbosch H., et al. EMAG2: A 2–arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements // Geochemistry, Geophysics, Geosystems. — 2009. — Vol. 10, no. 8. — P. 08005. — DOI: 10.1029/2009gc002471.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B32">
    <label>32.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Michael P. J., Langmuir C. H., Dick H. J. B., et al. Magmatic and amagmatic seafloor generation at the ultraslow-spreading Gakkel ridge, Arctic Ocean // Nature. — 2003. — Vol. 423, no. 6943. — P. 956–961. — DOI: 10.1038/nature01704.</mixed-citation>
     <mixed-citation xml:lang="en">Michael P. J., Langmuir C. H., Dick H. J. B., et al. Magmatic and amagmatic seafloor generation at the ultraslow-spreading Gakkel ridge, Arctic Ocean // Nature. — 2003. — Vol. 423, no. 6943. — P. 956–961. — DOI: 10.1038/nature01704.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B33">
    <label>33.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Morozov A., Vaganova N. Earthquake catalog of the Gakkel mid-ocean ridge (Arctic Ocean) according to the data of the Arkhangelsk seismic network (AH code) for the period from 2013 to 2022. — 2023. — DOI: 10.31905/smupnwep.</mixed-citation>
     <mixed-citation xml:lang="en">Morozov A., Vaganova N. Earthquake catalog of the Gakkel mid-ocean ridge (Arctic Ocean) according to the data of the Arkhangelsk seismic network (AH code) for the period from 2013 to 2022. — 2023. — DOI: 10.31905/smupnwep.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B34">
    <label>34.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Morozov A. N., Vaganova N. V., Antonovskaya G. N., et al. Low-Magnitude Earthquakes at the Eastern Ultraslow-Spreading Gakkel Ridge, Arctic Ocean // Seismological Research Letters. — 2021. — Vol. 92, no. 4. — P. 2221–2233. — DOI: 10.1785/0220200308.</mixed-citation>
     <mixed-citation xml:lang="en">Morozov A. N., Vaganova N. V., Antonovskaya G. N., et al. Low-Magnitude Earthquakes at the Eastern Ultraslow-Spreading Gakkel Ridge, Arctic Ocean // Seismological Research Letters. — 2021. — Vol. 92, no. 4. — P. 2221–2233. — DOI: 10.1785/0220200308.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B35">
    <label>35.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Müller C., Jokat W. Seismic evidence for volcanic activity discovered in central Arctic // Eos, Transactions American Geophysical Union. — 2000. — Vol. 81, no. 24. — P. 265. — DOI: 10.1029/00eo00186.</mixed-citation>
     <mixed-citation xml:lang="en">Müller C., Jokat W. Seismic evidence for volcanic activity discovered in central Arctic // Eos, Transactions American Geophysical Union. — 2000. — Vol. 81, no. 24. — P. 265. — DOI: 10.1029/00eo00186.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B36">
    <label>36.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">N. Laverov Federal Center for Integrated Arctic Research. Arkhangelsk Seismic Network. — 2002. — DOI: 10.7914/SN/AH.</mixed-citation>
     <mixed-citation xml:lang="en">N. Laverov Federal Center for Integrated Arctic Research. Arkhangelsk Seismic Network. — 2002. — DOI: 10.7914/SN/AH.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B37">
    <label>37.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Omori F. On aftershocks of earthquakes // Journal of the College of Science. — 1894. — Vol. 7. — P. 111–200.</mixed-citation>
     <mixed-citation xml:lang="en">Omori F. On aftershocks of earthquakes // Journal of the College of Science. — 1894. — Vol. 7. — P. 111–200.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B38">
    <label>38.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">ORFEUS. — 2022. — URL: https://orfeus-eu.org/ (visited on 05/12/2022).</mixed-citation>
     <mixed-citation xml:lang="en">ORFEUS. — 2022. — URL: https://orfeus-eu.org/ (visited on 05/12/2022).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B39">
    <label>39.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Petrov O., Morozov A., Shokalsky S., et al. Crustal structure and tectonic model of the Arctic region // Earth-Science Reviews. — 2016. — Vol. 154. — P. 29–71. — DOI: 10.1016/j.earscirev.2015.11.013.</mixed-citation>
     <mixed-citation xml:lang="en">Petrov O., Morozov A., Shokalsky S., et al. Crustal structure and tectonic model of the Arctic region // Earth-Science Reviews. — 2016. — Vol. 154. — P. 29–71. — DOI: 10.1016/j.earscirev.2015.11.013.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B40">
    <label>40.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Reves-Sohn R., Edmonds H., Humphris S., et al. Scientific scope and summary of the Arctic Gakkel vents (AGAVE) expedition // EOS Transactions American Geophysical Union. Vol. 1. — American Geophysical Union, 2007. — P. 7.</mixed-citation>
     <mixed-citation xml:lang="en">Reves-Sohn R., Edmonds H., Humphris S., et al. Scientific scope and summary of the Arctic Gakkel vents (AGAVE) expedition // EOS Transactions American Geophysical Union. Vol. 1. — American Geophysical Union, 2007. — P. 7.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B41">
    <label>41.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Riedel C., Schlindwein V. Did the 1999 earthquake swarm on Gakkel Ridge open a volcanic conduit? A detailed teleseismic data analysis // Journal of Seismology. — 2010. — Vol. 14, no. 3. — P. 505–522. — DOI: 10.1007/s10950-009-9179-6.</mixed-citation>
     <mixed-citation xml:lang="en">Riedel C., Schlindwein V. Did the 1999 earthquake swarm on Gakkel Ridge open a volcanic conduit? A detailed teleseismic data analysis // Journal of Seismology. — 2010. — Vol. 14, no. 3. — P. 505–522. — DOI: 10.1007/s10950-009-9179-6.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B42">
    <label>42.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Ringdal F., Kværna T. A multi-channel processing approach to real time network detection, phase association, and threshold monitoring // Bulletin of the Seismological Society of America. — 1989. — Vol. 79, no. 6. — P. 1927–1940. — DOI: 10.1785/BSSA0790061927.</mixed-citation>
     <mixed-citation xml:lang="en">Ringdal F., Kværna T. A multi-channel processing approach to real time network detection, phase association, and threshold monitoring // Bulletin of the Seismological Society of America. — 1989. — Vol. 79, no. 6. — P. 1927–1940. — DOI: 10.1785/BSSA0790061927.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B43">
    <label>43.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Schlindwein V. Teleseismic earthquake swarms at ultraslow spreading ridges: indicator for dyke intrusions? // Geophysical Journal International. — 2012. — Vol. 190, no. 1. — P. 442–456. — DOI: 10.1111/j.1365-246x.2012.05502.x.</mixed-citation>
     <mixed-citation xml:lang="en">Schlindwein V. Teleseismic earthquake swarms at ultraslow spreading ridges: indicator for dyke intrusions? // Geophysical Journal International. — 2012. — Vol. 190, no. 1. — P. 442–456. — DOI: 10.1111/j.1365-246x.2012.05502.x.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B44">
    <label>44.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Schlindwein V., Demuth A., Korger E., et al. Seismicity of the Arctic mid-ocean Ridge system // Polar Science. — 2015. — Vol. 9, no. 1. — P. 146–157. — DOI: 10.1016/j.polar.2014.10.001.</mixed-citation>
     <mixed-citation xml:lang="en">Schlindwein V., Demuth A., Korger E., et al. Seismicity of the Arctic mid-ocean Ridge system // Polar Science. — 2015. — Vol. 9, no. 1. — P. 146–157. — DOI: 10.1016/j.polar.2014.10.001.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B45">
    <label>45.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Schmid F., Schlindwein V., Koulakov I., et al. Magma plumbing system and seismicity of an active mid-ocean ridge volcano // Scientific Reports. — 2017. — Vol. 7, no. 1. — DOI: 10.1038/srep42949.</mixed-citation>
     <mixed-citation xml:lang="en">Schmid F., Schlindwein V., Koulakov I., et al. Magma plumbing system and seismicity of an active mid-ocean ridge volcano // Scientific Reports. — 2017. — Vol. 7, no. 1. — DOI: 10.1038/srep42949.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B46">
    <label>46.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Spence W. Relative epicenter determination using P-wave arrival-time differences // Bulletin of the Seismological Society of America. — 1980. — Vol. 70, no. 1. — P. 171–183. — DOI: 10.1785/BSSA0700010171.</mixed-citation>
     <mixed-citation xml:lang="en">Spence W. Relative epicenter determination using P-wave arrival-time differences // Bulletin of the Seismological Society of America. — 1980. — Vol. 70, no. 1. — P. 171–183. — DOI: 10.1785/BSSA0700010171.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B47">
    <label>47.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Tarasewicz J., Brandsdóttir B., White R. S., et al. Using microearthquakes to track repeated magma intrusions beneath the Eyjafjallajökull stratovolcano, Iceland // Journal of Geophysical Research: Solid Earth. — 2012. — Vol. 117, B9. — P. 1–13. — DOI: 10.1029/2011jb008751.</mixed-citation>
     <mixed-citation xml:lang="en">Tarasewicz J., Brandsdóttir B., White R. S., et al. Using microearthquakes to track repeated magma intrusions beneath the Eyjafjallajökull stratovolcano, Iceland // Journal of Geophysical Research: Solid Earth. — 2012. — Vol. 117, B9. — P. 1–13. — DOI: 10.1029/2011jb008751.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B48">
    <label>48.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">The Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO). — 1996. — URL: https://www.ctbto.org/ (visited on 03/31/2023).</mixed-citation>
     <mixed-citation xml:lang="en">The Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO). — 1996. — URL: https://www.ctbto.org/ (visited on 03/31/2023).</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B49">
    <label>49.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Thiede J., Oerter H. The Expedition ANTARKTIS XVII/2 of the Research Vessel POLARSTERN in 2000. Vol. 404. — Bremerhaven : Alfred Wegener Institute for Polar, Marine Research, 2002. — P. 245.</mixed-citation>
     <mixed-citation xml:lang="en">Thiede J., Oerter H. The Expedition ANTARKTIS XVII/2 of the Research Vessel POLARSTERN in 2000. Vol. 404. — Bremerhaven : Alfred Wegener Institute for Polar, Marine Research, 2002. — P. 245.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B50">
    <label>50.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Tolstoy M., Bohnenstiehl D. R., Edwards M. H., et al. Seismic character of volcanic activity at the ultraslow-spreading Gakkel Ridge // Geology. — 2001. — Vol. 29, no. 12. — P. 1139. — DOI: 10.1130/0091-7613(2001)029&lt;1139:scovaa&gt;2.0.co;2.</mixed-citation>
     <mixed-citation xml:lang="en">Tolstoy M., Bohnenstiehl D. R., Edwards M. H., et al. Seismic character of volcanic activity at the ultraslow-spreading Gakkel Ridge // Geology. — 2001. — Vol. 29, no. 12. — P. 1139. — DOI: 10.1130/0091-7613(2001)029&lt;1139:scovaa&gt;2.0.co;2.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B51">
    <label>51.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Wanless V. D., Behn M. D., Shaw A. M., et al. Variations in melting dynamics and mantle compositions along the Eastern Volcanic Zone of the Gakkel Ridge: insights from olivine-hosted melt inclusions // Contributions to Mineralogy and Petrology. — 2014. — Vol. 167, no. 5. — P. 1–22. — DOI: 10.1007/s00410-014-1005-7.</mixed-citation>
     <mixed-citation xml:lang="en">Wanless V. D., Behn M. D., Shaw A. M., et al. Variations in melting dynamics and mantle compositions along the Eastern Volcanic Zone of the Gakkel Ridge: insights from olivine-hosted melt inclusions // Contributions to Mineralogy and Petrology. — 2014. — Vol. 167, no. 5. — P. 1–22. — DOI: 10.1007/s00410-014-1005-7.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B52">
    <label>52.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Wiemer S., Wyss M. Minimum Magnitude of Completeness in Earthquake Catalogs: Examples from Alaska, the Western United States, and Japan // Bulletin of the Seismological Society of America. — 2000. — Vol. 90, no. 4. — P. 859–869. — DOI: 10.1785/0119990114.</mixed-citation>
     <mixed-citation xml:lang="en">Wiemer S., Wyss M. Minimum Magnitude of Completeness in Earthquake Catalogs: Examples from Alaska, the Western United States, and Japan // Bulletin of the Seismological Society of America. — 2000. — Vol. 90, no. 4. — P. 859–869. — DOI: 10.1785/0119990114.</mixed-citation>
    </citation-alternatives>
   </ref>
  </ref-list>
 </back>
</article>
