KHUBSGUL EARTHQUAKE OF JANUARY 12, 2021, <i>M</i>w = 6.7, NORTHERN MONGOLIA: GEOLOGICAL EFFECTS AND TECTONIC POSITION OF THE SOURCE

Abstract

The geological effects of the Khubsgul earthquake on January 12, 2021 with Mw = 6.7, which became the strongest in the Khubsgul region at the instrumental stage of seismological observations, were studied and mapped. Using the ESI-2007 scale, the epicentral zone was contoured with an intensity VIII. The primary seismic rupture is represented by a dextral normal fault with displacement up to 20 cm, which renewed the Late Holocene tectonic scarp in the western side of the Khubsgul rift basin. The dynamics of rupturing in the Late Holocene testifies to the gradual expansion of the depression due to the destruction of the adjacent mountain range. The data of satellite interferometry and seismological observations are in good agreement with the results of field studies, which allows us to consider the selected region of maximum shaking as a projection of the upper part of the source zone onto the surface.