Information message about strong earthquakes off South Sumatra, Indonesia, August 18, 2020

A strong earthquake (very strong at the epicenter on the SHSI-17 scale) with M = 6.8 occurred on August 18, 2020 at 22:24 GMT (August 19, 01:24 Moscow time) near South Sumatra, Indonesia, and 5.5 minutes later on August 18 at 22:29 GMT (August 19 at 01:29 Moscow time) another shock (at the epicenter, destructive on the SHSI-17 scale) with a magnitude of M = 7.2 took place.

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 15 min after registration to the Ministry of Emergency of the Russian Federation (EMERCOM). Alert message on the second earthquake has been delivered in 19 min.

Preliminary processing for the first earthquake has been done with data from 28 stations, accurate processing - with data from 70. Preliminary processing for the second earthquake has been done with data from 28 stations, accurate processing - with data from 70.

The red markers on the map are the epicenters of the earthquakes, the origins were located off the western coast of South Sumatra, Indonesia, at a depth of 25 km, the first earthquake was 131 km W-SW of Bengkulu, 374 km S-SE of Padang and 659 km W-NW of Jakarta , capital of Indonesia. The epicenter of the second earthquake was located 20 km NE 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 22:24:00.0 -4.24 101.18 25.0 70 6.8/39 6.6/38 8-8.50 73 GS RAS(Verified [1])
Federal research center, Geophysical survey of Russian Academy of Sciences
2 22:29:24.0 -4.11 101.29 25.0 72 7.2/37 6.7/41 8.5-9 73 GS RAS(Verified [2])
Federal research center, Geophysical survey of Russian Academy of Sciences
3 22:23:56..7 -4.2 101.19 0.0 28 6.6/19 GS RAS(Preliminary [1])
Federal research center, Geophysical survey of Russian Academy of Sciences
4 22:29:22.2 -4.0 101.4 0.0 31 6.7/21 GS RAS(Preliminary [2])
Federal research center, Geophysical survey of Russian Academy of Sciences
5 22:23:58.7 -4.29 101.18 10.0 238 Mw 6.8 33 CSEM(Verified [1])
European - Mediterranean seismological center
6 22:29:26.8 -4.109 101.37 38.9 393 Mw 6.9 6.1/103 25 CSEM(Verified [2])
European - Mediterranean seismological center
7 22:23:59.4 -4.35 101.13 22.0 127 Mw 6.8/29 6.3/99 51 NEIC(Verified [1])
National Earthquakes Information Center of US Geological Service
8 22:29:24.4 -4.28 101.23 26.0 128 Mw 6.9/11 6.4/99 34 NEIC(Verified [2])
National Earthquakes Information Center of US Geological Service