Centroid Moment Tensor of the Kamchatka Earthquake on July 29, 2025 Determined on GNSS Data and ISOLA Software Package

Dmitry Safonov; Nikolay Shestakov; Viktor Pupatenko; Aleksander Prytkov

doi:10.2205/2026es001125

UDC

550.34 55 550.383

CSCSTI

37.31 37.01 37.15 37.25 38.01

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36.00 37.00 38.00 39.00 52.00

Russian Classification of Professions by Education

05.06.01

Russian Trade and Bibliographic Classification

6323 63

Russian Library and Bibliographic Classification

268 26

BISAC

SCI082000 SCI

VAK Russia

1.6.9 1.6

CENTROID MOMENT TENSOR OF THE KAMCHATKA EARTHQUAKE ON JULY 29, 2025 DETERMINED ON GNSS DATA AND ISOLA SOFTWARE PACKAGE Centroid Moment Tensor of the Kamchatka Earthquake on July 29, 2025 Determined on GNSS Data and ISOLA Software Package

АА Аа

Published in Russian Journal of Earth Sciences · ELocator: ES2015 · Rubric: KAMCHATKA EARTHQUAKE M 8.8 ON JULY 29, 2025

DOI: https://doi.org/10.2205/2026es001125 · EDN: ULOMVG

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

Authors

Dmitry Safonov

ORCID Scopus ResearcherID SPIN

Nikolay Shestakov

ORCID Scopus ResearcherID SPIN

Viktor Pupatenko

Scopus ResearcherID SPIN

Aleksander Prytkov

ORCID Scopus ResearcherID SPIN

Dmitry Safonov

Institute of Marine Geology and Geophysics FEB RAS Russian Federation

ORCID Scopus ResearcherID SPIN

Nikolay Shestakov

Far Eastern Federal University assosiate professor · Vladivostok

Institute of Applied Mathematics FEB RAS Vladivostok

ORCID Scopus ResearcherID SPIN

Viktor Pupatenko

Institute of Tectonics and Geophysics, Far Eastern Branch of the Russian Academy of Sciences Senior Researcher · Russian Federation

Scopus ResearcherID SPIN

Aleksander Prytkov

Institute of Marine Geology and Geophysics FEB RAS Russian Federation

ORCID Scopus ResearcherID SPIN

ABSTRACT

Using the example of the Kamchatka earthquake on July 29, 2025, this study demonstrates the ability to determine the centroid moment tensor (CMT) of a strong earthquake based on GNSS records at regional distances. We used the ISOLA software package, which is typically used to obtain CMT solutions for weaker earthquakes. The CMT solution obtained using GNSS data agrees well with the solutions from leading global seismological agencies that used seismic records at teleseismic distances. It is also comparable to the CMT solution obtained by the authors based on seismic data from regional seismic stations. Due to the wide selection of GNSS observation point displacement records, which significantly exceeds the number of seismic observation points with broadband equipment, it was possible to obtain a better centroid location. The fact that there are no restrictions on the lower frequencies of the earthquake wave spectrum in GNSS records allowed us to determine the magnitude of the Kamchatka earthquake with high accuracy. The use of GNSS records in conjunction with traditional seismological data can be recommended for inclusion into the procedures of seismological services responsible for registering largest regional earthquakes and warning the population in hazardous areas of the threat of a tsunami.

KEYWORDS

Strong earthquake, focal mechanism solution, centroid moment tensor inversion, global navigation satellite systems, scalar seismic moment, Kamchatka megathrust earthquake

Funding

The work was carried out under the State Assignment of the IMGG FEB RAS. Work of N. V. Shestakov was partially supported by the state assignment for IAM FEB RAS No. 075-00460-26-00. The data used in the work were obtained with largescale research facilities “Seismic infrasound array for monitoring Arctic cryolithozone and continuous seismic monitoring of the Russian Federation, neighboring territories and the world” (https://ckp-rf.ru/usu/507436/). The authors are grateful to JSC “PRIN” for providing data from the PrinNet GNSS network.

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GOST

Safonov D. A., Shestakov N. V., Pupatenko V. V., Prytkov A. S. Centroid Moment Tensor of the Kamchatka Earthquake on July 29, 2025 Determined on GNSS Data and ISOLA Software Package // Russian Journal of Earth Sciences. 2026. no. 2. ES2015. DOI: https://doi.org/10.2205/2026es001125. EDN: ULOMVG. (Date of access 13.09.2026).

MLA

Dmitry Safonov, Shestakov N. V., Pupatenko V. V., Prytkov A. S.. "Centroid Moment Tensor of the Kamchatka Earthquake on July 29, 2025 Determined on GNSS Data and ISOLA Software Package." Russian Journal of Earth Sciences 26.2 (2026): ES2015. DOI: https://doi.org/10.2205/2026es001125. EDN: ULOMVG.

APA

Safonov D. A., Shestakov N. V., Pupatenko V. V., Prytkov A. S. (2026). Centroid Moment Tensor of the Kamchatka Earthquake on July 29, 2025 Determined on GNSS Data and ISOLA Software Package. Russian Journal of Earth Sciences, 26(2), ES2015. https://doi.org/10.2205/2026es001125 EDN: ULOMVG.

Chicago

Dmitry Safonov, Shestakov N. V., Pupatenko V. V., Prytkov A. S.. "Centroid Moment Tensor of the Kamchatka Earthquake on July 29, 2025 Determined on GNSS Data and ISOLA Software Package." Russian Journal of Earth Sciences 26, no. 2 (2026): ES2015. https://doi.org/10.2205/2026es001125. EDN: ULOMVG.

WIKI

{{cite journal | author = Safonov D. A., Shestakov N. V., Pupatenko V. V., Prytkov A. S. | title = Centroid Moment Tensor of the Kamchatka Earthquake on July 29, 2025 Determined on GNSS Data and ISOLA Software Package | journal = Russian Journal of Earth Sciences | year = 2026 | volume = 26 | issue = 2 | pages = ES2015 | doi = 10.2205/2026es001125 }} EDN: ULOMVG

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CENTROID MOMENT TENSOR OF THE KAMCHATKA EARTHQUAKE ON JULY 29, 2025 DETERMINED ON GNSS DATA AND ISOLA SOFTWARE PACKAGE Centroid Moment Tensor of the Kamchatka Earthquake on July 29, 2025 Determined on GNSS Data and ISOLA Software Package

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