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Kudara Earthquake of September 12, 2020 (MW = 5.5) on Lake Baikal: Results of Instrumental and Macroseismic Observations

Authors
  • Tubanov, Ts. A.1, 2
  • Sanzhieva, D. P.-D.1, 2
  • Kobeleva, E. A.3
  • Predein, P. A.1, 2
  • Tcydypova, L. R.1, 2
  • 1 Geological Institute, Siberian Branch, Russian Academy of Sciences, Ulan-Ude, 670047, Russia , Ulan-Ude (Russia)
  • 2 Buryat Branch, Federal Research Center Geophysical Survey, Russian Academy of Sciences, Ulan-Ude, 670047, Russia , Ulan-Ude (Russia)
  • 3 Baikal Branch, Federal Research Center Geophysical Survey, Russian Academy of Sciences, Irkutsk, 664033, Russia , Irkutsk (Russia)
Type
Published Article
Journal
Seismic Instruments
Publisher
Pleiades Publishing
Publication Date
Feb 01, 2022
Volume
58
Issue
1
Pages
86–98
Identifiers
DOI: 10.3103/S0747923922010108
Source
Springer Nature
Keywords
Disciplines
  • Article
License
Yellow

Abstract

AbstractThe article discusses the results of processing instrumental and macroseismic observations of the strongest earthquake in Central Baikal in the last 60 years, which occurred on December 9, 2020 (MW = 5.5), as well as its aftershocks. The event was named the Kudara earthquake, after the locality where the maximum intensity of shocks was recorded. The epicenter of the main shock is confined to Proval Bay (Lake Baikal), which formed as a result of the catastrophic Tsagan earthquake of 1862. The sufficiently high density of seismic stations in the region allowed us to obtain reliable estimates of the position of epicenters and source depths for the main shock and aftershocks. In total, more than 70 earthquakes were recorded, located within an area extending in the sublatitudinal direction. The strongest aftershock (KR = 12.6) occurred to the west of the main source on the first day after the main shock. To estimate the seismic moment and focal spectrum of the earthquake, the coda envelope inversion method was tested. The moment magnitudes for the main shock and three aftershocks have been obtained.

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