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Information message about tangible earthquake in Tajikistan, June 16, 2020

An earthquake (at the epicenter noticeable on the SHSI-17 scale) with M = 6.1 occurred on June 16, 2020 at 01:30 GMT (04:30 Moscow time) in Tajikistan.

Parameters of the earthquake have been determined in the Alert Service (AS) of Information Processing Center (IPC) of Geophysical Survey of RAS in Obninsk with station data obtained from digital and analog seismic stations of Russia, countries of CIS and from abroad. Alert message on this earthquake has been delivered in 10 min after registration to the Ministry of Emergency of the Russian Federation (EMERCOM).

Preliminary processing has been done with data from 17 stations, accurate processing - with data from 59.

The red marker on the map is the epicenter of the earthquake, the origin was located in Tajikistan, at a depth of 120 km, 175 km E-NE of Faizabad, Afghanistan, 280 km S of Ferghana, Uzbekistan, and 310 km E-SE of Dushanbe, the capital of Tajikistan.

	Time in origin (GMT)	Latitude, degree	Longitude, degree	Depth, km	Stations number	Ms/N	mb/N	I0 (calculated)	GAP	Center
1	01:30:47.0	37.89	72.31	120.0	59		6.1/40	4-4.5	48	GS RAS(Verified) Federal research center, Geophysical survey of Russian Academy of Sciences
2	01:30:49.4	38.3	72.19	100.0	17		6.2/11	4.5-5		GS RAS(Preliminary) Federal research center, Geophysical survey of Russian Academy of Sciences
3	01:30:46.8	37.85	72.37	112.0	448	Mw 5.7			17	CSEM European - Mediterranean seismological center
4	01:30:47.4	37.83	72.26	118.0	156	Mw 5.7/16	5.7/99		18	NEIC National Earthquakes Information Center of US Geological Service

Fig. 1 presents fragments of records obtained from digital stations Chuyangaron (∆ 2.6º), Ala-Archa (∆ 5º), Makanchi Array (∆ 11.6º), Kurchatov (∆ 13.6º), Zalesovo (∆ 18.2º). Fig. 2 presents fragments of records obtained from digital stations Arti (∆ 20.7º), Garni (∆ 21.5º), Belogornoye (∆ 22.5º), Khabaz (∆ 22.9º), Kislovodsk (∆ 23.1º).

Image 1

Image 2

According to National Information Agency of Tajikistan (NIAT) "Khovar" with reference to the Geophysical Service of the National Academy of Sciences of Tajikistan this earthquake was felt in Dushanbe with intensity of 2-3 MSK. According to GS RAS this earthquake was felt in Andijan, Namangan, Gulistan, Ferghana with intnsity of 3 MSK, in Tashkent, Jizzakh, Samarkand, Bukhara, Termez, Karshi and Navoi with intnsity of 2 MSK. Fig. 1 was obtained from USGS NEIC, it presents USGS Community Internet Intensity Map made by 21 responses in 11 cities.

Image 1

Click here to view detailed macroseismic data (DyfitWeb service)

The focal mechanism solution of the origin for this earthquake was calculated in GS RAS with signs of initial arrivals of P waves at 60 stations, including 22 stations which registered compression waves (plus signs) and 38 stations which registered tensile waves (minus signs). Threse stations are located in the interval of epicentral distances 1.7-97.9º and in the azimuth sector Az=9-356º. The focal mechanism solution in the stereographic projection on the lower hemisphere and the elements of the mechanism are presented in the table.. The table also presents focal mechanism solutions obtained in USGS NEIC with W-phase Moment Tensor (Mww) technique and at German Research Center for Geosciences, GFZ. The earthquake occurred due to the slight prevalence of tensile stresses oriented to the SE (AZ=124-133º) according to GS RAS and GFZ and S-SE (AZ=153º) according to USGS NEIC. One nodal plane NP1 strikes SE (STK=132º) according to GS RAS, N-NE (STK=24º) according to USGS NEIC and E according to (STK=94º) GFZ, another plane NP2 strikes W-SW (STK=236-249º). NP2 plane lies more hollow (DP=12-34º) if compared with NP1 (DP=73-80º). The type of motion along NP1 – right latteral slip with reverse fault component according to GS RAS, the thrust with left latteral slip component according to USGS NEIC and thrust with right latteral slip component according to GFZ, for NP2 – reverse fault. According to USGS NEIC Mo= 2.802*10**17 N*m, Mww=5.6. According to GFZ – Mo=3.7*10**17 N*m, Mw=5.6.

Axes of main strengths			Nodal planes		Center
T	P	N	NP1	NP2	Center
PI: 53 Azm: 124	PI: 23 Azm: 1	PI: 28 Azm: 259	Stk: 132 Dp: 34 Slip: 148	Stk: 249 Dp: 73 Slip: 61	GS RAS Federal research center, Geophysical survey of Russian Academy of Sciences
PI: 59 Azm: 133	PI: 28 Azm: 337	PI: 10 Azm: 242	Stk: 94 Dp: 19 Slip: 124	Stk: 239 Dp: 74 Slip: 78	GFZ German Research Center for Geosciences
PI: 55 Azm: 153	PI: 35 Azm: 320	PI: 6 Azm: 55	Stk: 24 Dp: 12 Slip: 58	Stk: 236 Dp: 80 Slip: 96	NEIC National Earthquakes Information Center of US Geological Service