SEISMICITY of the ALTAI and SAYAN region in 2018–2019

Abstract

The seismicity of the Altai-Sayan region in 2018–2019 is considered. The stationary seismic network within the reporting period consisted of 55 stations. Upgrading the recording equipment and retrofitting the stations with strong motion sensors was continued. In addition to the stationary network, five local networks functioned in the region. One of them investigated the seismic process and accumulated data for constructing the Moho boundary using the method of receiving functions in the Altai Republic, the other four were focused on the study of technogenic seismicity in the area of coal minings of the Kemerovo and Novosibirsk regions. During the reporting period, 15405 earthquakes were registered in the region, 52 % of them occurred in the Chui-Kurai zone of the Altai Mountains, for which a brief description of seismicity is given separately. The total seismic energy released in earthquake foci was 2.191012 J in 2018 and 1.171013 J in 2019. The slope of the linear part of the earthquake recurrence chart for 2018–2019 has not undergone significant changes compared to previous reporting periods. The largest earthquake on the territory of the Altai-Sayan region for the reporting period (ML=6.2) occurred on February 1, 2019 at 21h54m in China, 70 km south of the Zaisan lake