Background earthquakes and aftershock sequences of the strongest intraplate earthquakes in Central Asia-Reference-Cited by-同舟云学术

Background earthquakes and aftershock sequences of the strongest intraplate earthquakes in Central Asia

Published:2024-02-21 Issue:3 Volume: Page:36-45
ISSN:2619-1563
Container-title:Russian Journal of Geophysical Technologies
language:
Short-container-title:Russian Journal of geophysical technologies

Author:

Kuchay O. A.¹

Affiliation:

1. Trofimuk Institute of Petroleum Geology and Geophysics SB RAS
Koptyug Ave., 3, Novosibirsk, 630090

Abstract

Within the analyzed observation period (1971–2021), the values of the total magnitude of the scalar seismic moment obtained from the aftershocks of the strongest earthquakes (Мw ≥ 7.6) Asia (φ=20–50 N, λ=60–105° E), are weakly correlated with the total magnitude of the scalar seismic moment of background seismicity in the region of the main earthquake. A high level of seismic activity is manifested in the zones of large active faults and is reflected in the total magnitude of the scalar seismic moment of aftershock sequences. The types of movements in the foci of the main events do not affect the degree of aftershock activity (the total values of the scalar seismic moment) and occur at different background levels. Over the past 50 years, the magnitude of the strongest earthquakes has increased compared to the previous fifty-year period.

Publisher

Trofimuk Institute of Petroleum Geology and Geophysics (SB RAS)

Reference16 articles.

1. Bachmanov D.M., Kozhurin A.I., Trifonov V.G. The active faults of Eurasia database // Geodynamics & Tectonophysics. – 2017. – Vol. 8 (4). – P. 711–736, doi: 10.5800/GT-2017-8-4-0314.

2. Baranov S.V., Shebalin P.N. Estimating aftershock area based on the mainshock information // Geophysical Research. – 2018. – Vol. 19 (2). – P. 34–56, doi: 10.21455/gr2018.2-2.

3. Baranov S.V., Shebalin P.N. Regularities of postseismic processes and the forecast of the danger of strong aftershocks. – RAS, Moscow, 2019a. – 217 p.

4. Baranov S.V., Shebalin P.N. Global statistics of aftershocks following large earthquakes: independence of times and magnitudes // Journal of Volcanology and Seismology. – 2019b. – Vol. 13 (2). – P. 124–130, doi: 10.1134/S0742046319020027.

5. Das R., Wason H.R., Sharma M.L. Global regression relations for conversion of surface wave and body wave magnitudes to moment magnitude // Natural Hazards. – 2011. – Vol. 59 (2). – P. 801–810, doi: 10.1007/s11069-011-9796-6.