Information message about tangible earthquakes in the Commander Islands area on June 25 and 26, 2019

A significant earthquake with a magnitude of M = 6.2 occurred on June 25, 2019 at 09:05 GMT (12:05 Moscow time) in the area of the Commander Islands. Another shock with magnitude M = 6.4 occurred less than 18 hours later, on June 26 at 02:18 (05:18 Moscow time).

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 the first earthquake has been delivered in 9 min after registration to the Ministry of Emergency of the Russian Federation (EMERCOM). Alert message on the second earthquake has been delivered in 10 min.

Preliminary processing for the first earthquake has been done with data from 10 stations, accurate processing - with data from 63. Preliminary processing for the second earthquake has been done with data from 10 stations, accurate processing - with data from 63.

The red markers on the map indicate the epicenters of the earthquakes, the origins were located in the region of Commander Islands, at a depth of 10 km, the first origin was100 km east of Ust-Kamchatsk, 205 km east of Klyuchi and 500 km NE of Petropavlovsk-Kamchatsky, and the second origin was 12 km SW of the first one.
Time in origin (GMT) Latitude, degree Longitude, degree Depth, km Stations number Ms/N mb/N I0 (calculated) GAP Center
1 09:05:38.1 56.2 164.16 10.0 63 6.2/37 6.1/32 8.5-9 74 GS RAS(Verified [1])
Federal research center, Geophysical survey of Russian Academy of Sciences
2 02:18:05.0 56.09 164.12 10.0 73 6.4/42 6.4/41 9-9.5 48 GS RAS(Verified [2])
Federal research center, Geophysical survey of Russian Academy of Sciences
3 09:05:39.5 56.16 164.28 10.0 10 6.0/8 GS RAS(Preliminary [1])
Federal research center, Geophysical survey of Russian Academy of Sciences
4 02:18:11.1 56.07 164.65 11.0 11 6.2/9 GS RAS(Preliminary [2])
Federal research center, Geophysical survey of Russian Academy of Sciences
5 09:05:40.8 56.19 164.29 10.0 338 Mw 6.3 54 CSEM(Verified [1])
European - Mediterranean seismological center
6 02:18:07.9 56.19 164.13 10.0 366 Mw 6.4 19 CSEM(Verified [2])
European - Mediterranean seismological center
7 09:05:40.9 56.21 164.18 10.0 113 Mw 6.3 6.1 55 NEIC(Verified [1])
National Earthquakes Information Center of US Geological Service
8 02:18:07.9 56.19 164.13 0.0 137 22 NEIC(Verified [2])
National Earthquakes Information Center of US Geological Service
9 09:05:39.5 56.18 164.41 57.0 Ml 6.4 KAGSR(Verified [1])
Kamchatka Regional Seismological Centre, Petropavlovsk-Kamchatskiy, Geophysical Survey, Russian Academy of Sciences
10 02:18:06.6 56.16 164.36 53.0 Ml 6.5 KAGSR(Verified [2])
Kamchatka Regional Seismological Centre, Petropavlovsk-Kamchatskiy, Geophysical Survey, Russian Academy of Sciences