On Monday (20 September), two earthquakes rocked the Irkutsk Oblast in East Siberia. Tremors from Russia were felt across the border in the  neighbouring Mongolian provinces of Selenge, Orkhon, Khuvsgul and Darkhan-Uul. According to Russian sources, the epicenter of earthquakes was located 15 kilometers from the settlement of Kultuk.

The Mongolian Institute of Astronomy and Geophysics reported that a 5.5 magnitude earthquake occurred 28 km of northwest of Slyudyanka, a town located on the shores of Lake Baikal. The main event took place at 02.04 a.m. (Mongolian time) to be followed 15 minute later with a 4.4 magnitude aftershock. So strong were the shockwaves from the earthquake that many Mongolians living across the border were woken from their sleep. Fortunately, there were no casualties or damage to property.

Since the beginning of 2020, a total of 45,000 earthquakes have been registered in Mongolia; only 46 of them were above 3.5 magnitudes. On 20 March, 5.9 magnitudes earthquake shook in Gobi-Altai province of Mongolia. It was strongest magnitude of earthquake registered in the country since records began.