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The Muyakan Earthquake Sequence in the North Muya Region of the Baikal Rift Zone: Detailed Analysis and Possible Reasons

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Abstract

We present results of detailed studies of the Muyakan earthquake sequence, which occurred in the North Muya region of the Baikal rift zone and which is the largest one in the Baikal region as a whole. In its epicentral area, more than 16 thousands of seismic events with M ≥ 1.0 were registered in 2014–2018. The considered sequence is of interest due to the specific tectonic pattern of the North Muya region, occupying a part of the mountain range between the Upper Angara and Muya rift basins, and the proximity of its epicentral field to the eastern portal of the North Muya tunnel of the Baikal-Amur Railway. An analysis of unique seismological data, obtained during the sequence, shows that its seismic regime is characterized by a division of the epicentral field into separate clusters, in which the earthquakes with the most reliably determined depths (about 600 seismic events) occurred in the upper crust (h 4–10 km, δh < 3 km). Focal mechanisms, determined for 111 earthquakes with M ≥ 2.8 from P-wave first-motion polarities recorded at regional stations, and seismic moment tensors, calculated for 20 events with Mw ≥ 4.2 from teleseismic surface wave data, demonstrate various types of movements in the earthquake sources. Nethertheless, about 50% of the considered events are normal (rift) faults. The tectonic fragmentation of the crust and its intensive flooding with deep thermal waters in the area of the intersection of the Perevalny and Muyakan faults are two possible reasons for the Muyakan sequence occurrence. At the same time, the state of the local seismoactive mountain massif could also be influenced by man-made factors, associated with redistribution of stresses in the crust related to construction and operation of the North Muya tunnel.

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Acknowledgements

We are grateful to the administration of the Geophysical Survey of the Russian Academy of Sciences for the opportunity to use the data from their unique research complex (Seismoinfrasonic Complex for Monitoring the Arctic Cryolithozone and Complex for Continuous Seismic Monitoring of the Russian Federation, Adjacent Areas, and the World). We kindly thank Yan B. Radziminovich (Baikal Branch of FRC GS RAS) for technical assistance in preparing the manuscript. The study is partially based on the data from the equipment of the Centre of Geodynamics and Geochronology (Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences).

Funding

This work was supported by the Russian Foundation for Basic Research under project No 20-05-00823.

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  1. Institute of the Earth’s Crust of SB RAS, Irkutsk, Russia

    Valentina I. Melnikova

  2. Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation of RAS, Troitsk, Moscow, Russia

    Alena I. Filippova

  3. Baikal Branch of Federal Research Center, Geophysical Survey of RAS, Irkutsk, Russia

    Nadezhda A. Gileva

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All authors conceived and designed given of the study. Material preparation, data collection and analysis were performed by VIM, AIF, NAG. VIM and AIF wrote the paper. NAG contributed to visualization of the data. All authors read and approved the final manuscript.

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Correspondence to Valentina I. Melnikova.

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24_2022_3124_MOESM1_ESM.xls

Supplementary file1 (Table S1) Focal mechanisms during the Muyakan sequence for solutions obtained from regional P-wave first-motion polarities (XLS 51 KB)

24_2022_3124_MOESM2_ESM.xls

Supplementary file2 (Table S2) Focal mechanisms before and during the Muyakan sequence for solutions obtained from teleseismic surface wave data and regional P-wave first-motion polarities (XLS 370 KB)

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Melnikova, V.I., Filippova, A.I. & Gileva, N.A. The Muyakan Earthquake Sequence in the North Muya Region of the Baikal Rift Zone: Detailed Analysis and Possible Reasons. Pure Appl. Geophys. 179, 3157–3175 (2022). https://doi.org/10.1007/s00024-022-03124-7

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