Study of Seismic Activity Between the Mainshock and the First Aftershock of the Kamchatka Earthquake on July 29, 2025

Ivan Kitov; Irina A. Sanina; Inna N. Sokolova; Yurii Vinogradov

doi:10.2205/2026es001118

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STUDY OF SEISMIC ACTIVITY BETWEEN THE MAINSHOCK AND THE FIRST AFTERSHOCK OF THE KAMCHATKA EARTHQUAKE ON JULY 29, 2025 Study of Seismic Activity Between the Mainshock and the First Aftershock of the Kamchatka Earthquake on July 29, 2025

АА Аа

Published in Russian Journal of Earth Sciences · ELocator: ES2008 · Rubric: KAMCHATKA EARTHQUAKE M 8.8 ON JULY 29, 2025

DOI: https://doi.org/10.2205/2026es001118 · EDN: JEDWRH

Received: 02.02.2026 Accepted: 25.05.2026 Published: 01.07.2026 Language of publication: RUS

Authors

Ivan Kitov

ORCID

Irina A. Sanina

ORCID

Inna N. Sokolova

ORCID

Yurii Vinogradov

ORCID

Ivan Kitov

Academic degree: doctor of physical and mathematical sciences

Sadovsky Institute of Geosphere Dynamics Russian Academy of Sciences leading researcher · Russian Federation · Moscow

ORCID

Irina A. Sanina

Sadovsky Institute of Geosphere Dynamics Russian Academy of Sciences Russian Federation

ORCID

Inna N. Sokolova

Geophysical Survey Russian Academy of Sciences Russian Federation

ORCID

Yurii Vinogradov

Academic degree: doctor of technical sciences

Geophysical Survey Russian Academy of Sciences Russian Federation

ORCID

ABSTRACT

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.

KEYWORDS

Aftershocks, matched filter, noise whitening, International Monitoring System, International Data Centre, Kamchatka megathrust earthquake

Funding

This work was funded by the Russian Science Foundation (project No. 25-17-00106).

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GOST

Kitov I. O., Sanina I. A., Sokolova I. N., Vinogradov Y. A. Study of Seismic Activity Between the Mainshock and the First Aftershock of the Kamchatka Earthquake on July 29, 2025 // Russian Journal of Earth Sciences. 2026. no. 2. ES2008. DOI: https://doi.org/10.2205/2026es001118. EDN: JEDWRH. (Date of access 14.09.2026).

MLA

Ivan Kitov, Sanina I. A., Sokolova I. N., Vinogradov Y. A.. "Study of Seismic Activity Between the Mainshock and the First Aftershock of the Kamchatka Earthquake on July 29, 2025." Russian Journal of Earth Sciences 26.2 (2026): ES2008. DOI: https://doi.org/10.2205/2026es001118. EDN: JEDWRH.

APA

Kitov I. O., Sanina I. A., Sokolova I. N., Vinogradov Y. A. (2026). Study of Seismic Activity Between the Mainshock and the First Aftershock of the Kamchatka Earthquake on July 29, 2025. Russian Journal of Earth Sciences, 26(2), ES2008. https://doi.org/10.2205/2026es001118 EDN: JEDWRH.

Chicago

Ivan Kitov, Sanina I. A., Sokolova I. N., Vinogradov Y. A.. "Study of Seismic Activity Between the Mainshock and the First Aftershock of the Kamchatka Earthquake on July 29, 2025." Russian Journal of Earth Sciences 26, no. 2 (2026): ES2008. https://doi.org/10.2205/2026es001118. EDN: JEDWRH.

WIKI

{{cite journal | author = Kitov I. O., Sanina I. A., Sokolova I. N., Vinogradov Y. A. | title = Study of Seismic Activity Between the Mainshock and the First Aftershock of the Kamchatka Earthquake on July 29, 2025 | journal = Russian Journal of Earth Sciences | year = 2026 | volume = 26 | issue = 2 | pages = ES2008 | doi = 10.2205/2026es001118 }} EDN: JEDWRH

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STUDY OF SEISMIC ACTIVITY BETWEEN THE MAINSHOCK AND THE FIRST AFTERSHOCK OF THE KAMCHATKA EARTHQUAKE ON JULY 29, 2025 Study of Seismic Activity Between the Mainshock and the First Aftershock of the Kamchatka Earthquake on July 29, 2025

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