Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 91303 10.2205/2025ES001004 cjveyi ОРИГИНАЛЬНЫЕ СТАТЬИ ORIGINAL ARTICLES ОРИГИНАЛЬНЫЕ СТАТЬИ Geophysical Imaging of the Crust for the Source Area of the Khastakh Earthquake (NE Margin of the Siberian Platform, Yakutia) Geophysical Imaging of the Crust for the Source Area of the Khastakh Earthquake (NE Margin of the Siberian Platform, Yakutia) https://orcid.org/0009-0002-4330-033X Куляндина Альбина Семеновна Kulyandina Al'bina Semenovna albineku@gmail.com https://orcid.org/0000-0001-9793-1685 Филиппова Алена Игоревна Filippova Alena Igorevna https://orcid.org/0000-0002-5788-6944 Соколова Елена Юрьевна Sokolova Elena Yurievna Якутский филиал ФИЦ ЕГС РАН Якутск Россия Якутский филиал ФИЦ ЕГС РАН Yakutsk Russian Federation Институт земного магнетизма, ионосферы и распространения радиоволн им. Н.В. Пушкова РАН Россия Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation of RAS Russian Federation Всероссийский нефтяной научно-исследовательский геологоразведочный институт Россия All-Russian Research Geological Oil Institute Russian Federation Институт физики Земли им. О.Ю. Шмидта РАН Россия Schmidt Institute of Physics of the Earth of RAS Russian Federation 30 07 2025 30 07 2025 25 4 ES4008 29 11 2024 21 02 2025 https://rjes.ru/en/nauka/article/91303/view

In this study, we focus on the crustal structure in the vicinity of the source area of the May 20, 2011 Khastakh earthquake with Mw = 4.7. An interest in this seismic event is connected with a fact that it occurred within the Lena-Anabar trough at the margin of the Siberian platform, which is characterized by very low level of seismic activity. Spatial characteristics of the gravity and magnetic fields were studied and 3D models of the crustal density and magnetization contrasts were constructed using data on gravity and magnetic surveys and GIS INTEGRO software. A network of buried faults, to one of which the Khastakh earthquake is related, has been revealed. The presence of a magmatic intrusion, probably, playing a role in the redistribution of the crustal stress-strain state in the vicinity of the considered seismic event, is suggested based on the constructed crustal 3D models. The obtained results regarding structural frames of the Khastakh earthquake source were verified by previous magnetotelluric and seismic studies.

In this study, we focus on the crustal structure in the vicinity of the source area of the May 20, 2011 Khastakh earthquake with Mw = 4.7. An interest in this seismic event is connected with a fact that it occurred within the Lena-Anabar trough at the margin of the Siberian platform, which is characterized by very low level of seismic activity. Spatial characteristics of the gravity and magnetic fields were studied and 3D models of the crustal density and magnetization contrasts were constructed using data on gravity and magnetic surveys and GIS INTEGRO software. A network of buried faults, to one of which the Khastakh earthquake is related, has been revealed. The presence of a magmatic intrusion, probably, playing a role in the redistribution of the crustal stress-strain state in the vicinity of the considered seismic event, is suggested based on the constructed crustal 3D models. The obtained results regarding structural frames of the Khastakh earthquake source were verified by previous magnetotelluric and seismic studies.

 gravity and magnetic fields Khastakh earthquake Siberian platform GIS INTEGRO gravity and magnetic fields Khastakh earthquake Siberian platform GIS INTEGRO The authors are grateful to the colleagues from Nord West Ltd, who provide magnetotelluric materials for the integrated geophysical analyses, as well as colleagues from VNIGNI developing the GIS INTEGRO software. The study was fulfilled under the State Assignments of VNIGNI, IPE RAS, IZMIRAN. The work was carried out with the support of the Ministry of Education and Science of the Russian Federation (within the framework of state assignment No. 075-00604-25) and using data obtained from the unique scientific installation “Seismic infrasound array for monitoring Arctic cryolitozone and continuous seismic monitoring of the Russian Federation, neighbouring territories and the world” (http://www.gsras.ru/unu/). The authors are grateful to the colleagues from Nord West Ltd, who provide magnetotelluric materials for the integrated geophysical analyses, as well as colleagues from VNIGNI developing the GIS INTEGRO software. The study was fulfilled under the State Assignments of VNIGNI, IPE RAS, IZMIRAN. The work was carried out with the support of the Ministry of Education and Science of the Russian Federation (within the framework of state assignment No. 075-00604-25) and using data obtained from the unique scientific installation “Seismic infrasound array for monitoring Arctic cryolitozone and continuous seismic monitoring of the Russian Federation, neighbouring territories and the world” (http://www.gsras.ru/unu/).

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