DISTRIBUTION OF REDUCED SEISMIC ENERGY AND STRESS DROP IN THE ALTAI-SAYAN SEISMOACTIVE REGION
https://doi.org/10.5800/GT-2025-16-4-0835
EDN: HWNUFQ
Abstract
The data bank has been created to address the tensor of the seismic moment of earthquakes that occurred in the Altai-Sayan seismically active region in the period 1978–2025. The scalar seismic moment M0 for these events was already known from the CMT catalog. This paper presents estimates of the following dynamic parameters: source radius r, shear stress drop ∆σ, and reduced seismic energy ePR using a phenomenological approach based on previously obtained regression relationships between the source radius r and the scalar seismic moment M0. Stress drop and reduced seismic energy estimates have been obtained for 69 earthquakes with a magnitude MW 3.5–7.2. Thus, it allows to significantly expand the data bank on these earthquake parameters for the Altai-Sayan seismically active region. Maps have been drawn of the areally averaged estimates of stress drop and reduced seismic energy.
Keywords
earthquake,
seismicity,
scalar seismic moment,
moment magnitude,
source radius,
shear stress drop,
reduced seismic energy,
Altai-Sayan mountain region
Supporting agencies: The study was carried out on the state assignments of the Institute of Physics of the Earth RAS and the Institute of Marine Geology and Geophysics FEB RAS.
About the Authors
N. A. Sycheva
Schmidt Institute of Physics of the Earth, Russian Academy of Sciences
Russian Federation
Russian Federation
10-1 Bolshaya Gruzinskaya St, Moscow 123242
L. M. Bogomolov
Institute of Marine Geology and Geophysics, Far Eastern Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
1B Nauki St, Yuzhno-Sakhalinsk 693022
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For citations:
Sycheva N.A., Bogomolov L.M. DISTRIBUTION OF REDUCED SEISMIC ENERGY AND STRESS DROP IN THE ALTAI-SAYAN SEISMOACTIVE REGION. Geodynamics & Tectonophysics. 2025;16(4):0835. https://doi.org/10.5800/GT-2025-16-4-0835. EDN: HWNUFQ
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