Strong Earthquakes in the Northern Baikal Region in 2016–2017 (М_W = 5.0 and М_W = 4.8).

Melnikova, V. I.; Gileva, N. A.; Filippova, A. I.; Radziminovich, Ya. B.

This paper presents the results of a detailed study of two relatively strong seismic events, occurred on November, 22, 2016 (МW = 5.0) and April 3, 2017 (МW = 4.8) at the northeastern flank of the Baikal rift zone in the areas of the South Muya and Kalar ranges. Both the events were followed by weak aftershocks (N = 178–539, Кр ≤ 11.0), whose epicenters were densely distributed over an area. The seismic moment tensors and hypocentral depths of the mainshocks were calculated from surface wave amplitude spectra. It has been shown that their sources were formed under the influence of the subhorizontal SE–NW extension and the subhorizontal or inclined NE–SW compression. Both the earthquakes were followed by noticeable macroseismic effects at epicentral distances up to 500 km. In the area of the Baikal−Amur Railway, their shaking intensity was IV–V MSK-64. The results obtained can be used in continuous seismic monitoring at the northeastern flank of the Baikal rift zone and can contribute to an objective seismic hazard assessment of the study area.

EARTHQUAKES; SEISMIC response; EARTHQUAKE zones; SURFACE waves (Seismic waves); EARTHQUAKE aftershocks

Seismic Instruments, 2022, Vol 58, Issue 6, p611

0747-9239

Academic Journal

10.3103/S074792392206010X