SEISMICITY of TAJIKISTAN and ADJACENT TERRITORIES in 2018–2019

Abstract

In 2018–2019, seismic monitoring of the territory of Tajikistan with adjacent areas of several states was carried out by a network of 7 digital seismic stations of the Geophysical Servey of the National Academy of Sciences of Tajikistan. For two years, 17195 earthquakes with energy classes KR=8.6–14.9 were registered. Among them 2870 were small–focus (h<70 km), scattered throughout the Southwestern Tien Shan (zone I), Southern Tien Shan (II), the crustal Pamir-Hindu Kush (III), and 14325 – with intermediate depths h=70–310 km, localized in the Pamir-Hindu Kush zone IV. 112 earthquakes were tangible, two of them, Sarikhosor earthquakes of March 29, 2018 with KR=13.1, I0=6 and of March 7, 2019 with KR=12.1, I0=5–6, were surveyed with the construction of isoseist maps and described in a separate article of this issue of the journal. The strongest (Mw>6) earthquakes were grouped in zone IV of Hindu Kush earthquakes with intermediate depths both in 2018 (January 31 with KR=14.8, Mw=6.2, h=200 km and May 9 with KR=14.9, Mw=6.3, h=105 km) and in 2019 (December 20 with KR=14.8, Mw=6.2, h=209 km). All notable earthquakes with foci in the Earth's crust occurred in the Southern Tien Shan zone (II) and associated with a system of near-latitudinal South-Hissar and Ilak-Vakhsh deep faults. Among them the earthquakes occurred in 2018 (March 29 with KR =13.1, N,афт=521; September 17 and December 5 with KR=12.0, N,aft=59) and in 2019 (March 7, KR=12.1, N, aft=53), which were accompanied by large series of aftershocks.