Analysis of the Deep Seismic Structure and Seismicity of the Transbaikalia (Along the 1-Sb Profile)

Solovyev, V. M.; Salnikov, A.; Селезнев, В. С.; Chechelnitsky, Vladimir; Gilyova, N. A.; Лисейкин, А. В.; Galyova, Natalya

doi:10.33764/2618-981x-2019-2-2-224-233

Interexpo GEO-Siberia

2019

DOI: 10.33764/2618-981x-2019-2-2-224-233

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Analysis of the Deep Seismic Structure and Seismicity of the Transbaikalia (Along the 1-Sb Profile)

V. M. Solovyev

A. Salnikov

В. С. Селезнев

et al.

Abstract: An analyzing on the seismicity and the deep structure of Transbaikalia along the 1-SB profile is presented. Determined that areas of high seismicity associated with the blocks of the Earth's crust with a heterogeneous velocity structure. The site of the Baikal rift zone which is located in close proximity to the Muya earthquake (1957, M=7.6) is characterized by increased heterogeneity according to the values of P- and S-waves and of elastic parameters in the Earth’s crust upper part.

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2024

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Determination of Earthquake Depths Using Data of Cross-Sectional and Areal Deep Seismic Studies in Siberia

Soloviev,

Seleznev,

Emanov

et al. 2024

Russian Geology and Geophysics

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––Information on the distribution of earthquake hypocenters for many seismically active zones of Siberia remains insufficient, which is associated with sparse networks of seismological observations. The paper presents the results of determining the earthquake depths in several seismogenic areas in the Altai-Sayan region, Cisbaikalia, Transbaikalia, and Yakutia using the travel time of longitudinal refracted waves from the Mohorovičič discontinuity (Pn waves) from earthquakes and the recently obtained information about the deep structure of these regions. The depth determination algorithm is tested using data from aftershocks of large earthquakes occurring in Tuva in 2011 and 2012 (ML = 6.7 and 6.8), recorded both by the regional seismological network and by a local group of seismic stations. Different methods are applied to reveal that some aftershock depths have a close match, including those for the main shocks – the Tuva-1 and Tuva-2 earthquakes. Another good match of earthquake depths is obtained using Рn waves with materials from regional and detailed studies of the Baikal branch of the Geophysical Survey of the Russian Academy of Sciences in the Muyakan activation site in the Baikal rift zone. The resulting data complement the information on the hypocenter of the main shock and confirm the change of the Muyakan activation cluster from large depths to shallow ones since the onset of activation in 2014. New information on the earthquake depths using Рn waves is obtained in Yakutia along the border of the largest Eurasian and Okhotsk tectonic plates. It is revealed that they decrease to 6–12 km as compared to higher depths of 20–30 km in adjacent areas. The resulting series of new information on the distribution of earthquake hypocenters using Рn waves is extremely important mostly because it indicates the possibility of identifying and redefining earthquake hypocenters using previous seismological observations in seismically active zones of Siberia.

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Determination of Earthquake Depths Using Data of Cross-Sectional and Areal Deep Seismic Studies in Siberia

Soloviev,

Seleznev,

Emanov

et al. 2024

Russian Geology and Geophysics

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Analysis of the Deep Seismic Structure and Seismicity of the Transbaikalia (Along the 1-Sb Profile)

Cited by 1 publication

References 1 publication

Determination of Earthquake Depths Using Data of Cross-Sectional and Areal Deep Seismic Studies in Siberia

Determination of Earthquake Depths Using Data of Cross-Sectional and Areal Deep Seismic Studies in Siberia

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