employee from 01.01.2011 to 01.01.2026
Khabarovsk, Khabarovsk, Russian Federation
Institute of Marine Geology and Geophysics FEB RAS
employee
Institute of Applied Mathematics FEB RAS
Russian Federation
VAK Russia 1.6
UDC 550.34
UDC 55
UDC 550.383
CSCSTI 37.31
CSCSTI 37.01
CSCSTI 37.15
CSCSTI 37.25
CSCSTI 38.01
CSCSTI 36.00
CSCSTI 37.00
CSCSTI 38.00
CSCSTI 39.00
CSCSTI 52.00
Russian Classification of Professions by Education 05.00.00
Russian Library and Bibliographic Classification 263
Russian Library and Bibliographic Classification 26
Russian Trade and Bibliographic Classification 6323
Russian Trade and Bibliographic Classification 63
BISAC SCI082000 Earth Sciences / Seismology & Volcanism
BISAC SCI SCIENCE
On July 29, 2025, a major earthquake with a moment magnitude of MW = 8.8 occurred off the coast of Kamchatka. The most accurate and rapid estimation of the magnitude of such events is a crucial task in modern seismology, particularly in the context of earthquake and tsunami early warning systems. In this study, we propose and test an approach for rapid MW estimation from accelerometer records based on an empirical relationship between peak ground displacement (PGD) and moment magnitude. Unlike most similar studies, we rely exclusively on accelerometric data from 13 seismic stations on Sakhalin and the Kuril Islands, without the use of GNSS observations. The final MW estimate derived from all stations was 8.75 ± 0.2, which is consistent with values reported by international agencies. Simulating real-time data processing demonstrated that a first stable magnitude estimate of MW = 7.6 ± 1.3 could be obtained as early as 4.5 minutes after the earthquake origin time, with a value of MW = 8.65 ± 0.3 available after 8 minutes. The results indicate that, given an existing accelerometer network, this methodology can provide reliable and sufficiently rapid estimates of the moment magnitude of major earthquakes without the need for GNSS data. This opens possibilities for enhancing the timeliness of source parameter estimation and for improving tsunami early warning systems in regions with developed seismic infrastructure, without requiring major modifications to existing seismic data processing systems.
Accelerograms, peak ground displacement, accelerometer network, warning system, great earthquakes, Kamchatka megathrust earthquake
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