сотрудник с 01.01.2021 по настоящее время
Москва, г. Москва и Московская область, Россия
Россия
УДК 550.34.062 Обнаружение
УДК 55 Геология. Геологические и геофизические науки
УДК 550.34 Сейсмология
УДК 550.383 Главное магнитное поле Земли
ГРНТИ 37.01 Общие вопросы геофизики
ГРНТИ 37.15 Геомагнетизм и высокие слои атмосферы
ГРНТИ 37.25 Океанология
ГРНТИ 37.31 Физика Земли
ГРНТИ 38.01 Общие вопросы геологии
ГРНТИ 36.00 ГЕОДЕЗИЯ. КАРТОГРАФИЯ
ГРНТИ 37.00 ГЕОФИЗИКА
ГРНТИ 38.00 ГЕОЛОГИЯ
ГРНТИ 39.00 ГЕОГРАФИЯ
ГРНТИ 52.00 ГОРНОЕ ДЕЛО
ОКСО 05.00.00 Науки о Земле
ББК 26 Науки о Земле
ТБК 63 Науки о Земле. Экология
BISAC SCI SCIENCE
The high-amplitude seismic waves generated by the earthquakes with magnitudes similar to that of the July 29, 2025 Kamchatka event (MW 8.8) create the background noise that can potentially mask any post-seismic activity during the first few minutes following the mainshock. Detection of signals from potential aftershocks buried in the coherent noise can be enhanced using a matched filter detector based on waveform cross-correlation with high-quality waveform templates obtained from historical events in the same region. The array stations of the International Monitoring System (IMS) located at regional and teleseismic distances provide one of the most effective networks for detecting seismic events globally. However, the coherence between noise signals and the sought signals, as generated by very similar sources in the same area, makes less efficient the detection methods based on noise suppression by velocity filtering such as beamforming. For the event on July 29, 2025 near Kamchatka Peninsula, the noise reduction method based on adding stochastic noise to the actual data was tested. During the initial 10-minute period following the mainshock, several reliable event hypotheses were created. These hypotheses are similar to those reported by the International Data Centre (IDC) and are based on the data from the same IMS stations. The IDC and the International Seismological Centre had not reported any events during this time frame, despite extended automatic and interactive analyses.
Aftershocks, matched filter, noise whitening, International Monitoring System, International Data Centre, Kamchatka megathrust earthquake
1. Adushkin V. V., Kitov I. O. and Sanina I. A. Further Development of the Matched Filter Method for Solving Seismological Problems // Doklady Earth Sciences. — 2025. — Vol. 523, no. 1. — https://doi.org/10.1134/s1028334x25606182
2. Arrowsmith S. J. and Eisner L. A technique for identifying microseismic multiplets and application to the Valhall field, North Sea // Geophysics. — 2006. — Vol. 71, no. 2. — P. 31–40. — https://doi.org/10.1190/1.2187804
3. Baisch S., Ceranna L. and Harjes H.-P. Earthquake Cluster: What Can We Learn from Waveform Similarity? // Bulletin of the Seismological Society of America. — 2008. — Vol. 98, no. 6. — P. 2806–2814. — https://doi.org/10.1785/0120080018
4. Bobrov D., Kitov I. and Zerbo L. Perspectives of Cross-Correlation in Seismic Monitoring at the International Data Centre // Pure and Applied Geophysics. — 2014. — Vol. 171, no. 3–5. — P. 439–468. — https://doi.org/10.1007/s00024-012-0626-x
5. Bobrov D. I., Kitov I. O., Rozhkov M. V., et al. Towards global seismic monitoring of underground nuclear explosions using waveform cross correlation. Part I: Grand master events // Seismic Instruments. — 2016a. — Vol. 52, no. 1. — P. 43–59. — https://doi.org/10.3103/s0747923916010035
6. Bobrov D. I., Kitov I. O., Rozhkov M. V., et al. Towards global seismic monitoring of underground nuclear explosions using waveform cross correlation. Part II: Synthetic master events // Seismic Instruments. — 2016b. — Vol. 52, no. 3. — P. 207–223. — https://doi.org/10.3103/s0747923916030038
7. Coyne J., Bobrov D., Bormann P., et al. CTBTO: Goals, Networks, Data Analysis and Data Availability // New Manual of Seismological Observatory Practice 2 (NMSOP2). — Deutsches GeoForschungsZentrum GFZ, 2012. — https://doi.org/10.2312/GFZ.NMSOP-2_CH15
8. Gvishiani A. D., Dzeranov B. V., Skorkina A. A., et al. World Seismic Networks and Earthquake Catalogs // Russian Journal of Earth Sciences. — 2024. — Vol. 24. — ES1012. — https://doi.org/10.2205/2024es000901 — (In Russian).
9. ISC Bulletin. — 2026. — https://doi.org/10.31905/D808B830
10. Israelsson H. Correlation of waveforms from closely spaced regional events // Bulletin of the Seismological Society of America. — 1990. — Vol. 80, 6B. — P. 2177–2193. — https://doi.org/10.1785/BSSA08006B2177
11. Joswig M. Pattern recognition for earthquake detection // Bulletin of the Seismological Society of America. — 1990. — Vol. 80, no. 1. — P. 170–186. — https://doi.org/10.1785/BSSA0800010170
12. Kennett B. L. N., Engdahl E. R. and Buland R. Constraints on seismic velocities in the Earth from traveltimes // Geophysical Journal International. — 1995. — Vol. 122, no. 1. — P. 108–124. — https://doi.org/10.1111/j.1365-246x.1995.tb03540.x
13. Kitov I. Cross-correlation Standard Event List of Seismic Activity between the Mainshock and the First Aftershock of the Kamchatka Earthquake on July 29 2025. — 2026. — https://doi.org/10.31905/awqbgagq
14. Savage J. C. The stopping phase on seismograms // Bulletin of the Seismological Society of America. — 1965. — Vol. 55, no. 1. — P. 47–58. — https://doi.org/10.1785/BSSA0550010047
15. Schaff D. P., Kim W.-Y. and Richards P. G. Background Seismicity for parts of the northern Korean peninsula // SnT2025. CTBT: Science and Technology Conference. — Vienna, Austria : CTBTO, 2025.
16. Schaff D. P. and Richards P. G. Repeating Seismic Events in China // Science. — 2004. — Vol. 303, no. 5661. — P. 1176– 1178. — https://doi.org/10.1126/science.1093422
17. Schweitzer J., Fyen J., Mykkeltveit S., et al. Seismic Arrays // New Manual of Seismological Observatory Practice 2 (NMSOP2). — Deutsches GeoForschungsZentrum GFZ, 2012. — https://doi.org/10.2312/GFZ.NMSOP-2_CH9
18. Sultanov J. J. The role of G. A. Gamburtsev in creating a seismic monitoring method for nuclear testing // Grigory Aleksandrovich Gamburtsev (1903–1955): Memories, essays, articles. — M. : OIFZ RAN, 1998. — P. 188–193. — (In Russian).
19. Turin G. L. An introduction to matched filters // IRE Transactions on Information Theory. — 1960. — Vol. 6, no. 3. — P. 311–329. — https://doi.org/10.1109/tit.1960.1057571
