Information message about Sulawesi Island Severe Earthquake, Indonesia, January 14, 2021

A strong earthquake (significant at the epicenter on the SHSI-17 scale) with M = 5.1 occurred on January 14, 2021 at 06:35 GMT (09:35 Moscow time) on the island of Sulawesi, Indonesia. Less than 12 hours later, at 18:27 GMT (21:27 Moscow time), there was a second shock (strong at the epicenter on the SHSI-17 scale) with a magnitude of M = 5.9.

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 18 min after registration to the Ministry of Emergency of the Russian Federation (EMERCOM). Alert message on the second earthquake has been delivered in 16 min.

Preliminary processing for the first earthquake has been done with data from 16 stations, accurate processing - with data from 56. Preliminary processing for the second earthquake has been done with data from 16 stations, accurate processing - with data from 56.

The red markers on the map are the epicenters of these earthquakes, whose origins were on the island of Sulawesi, Indonesia, at a depth of 20 km. The epicenter of the first earthquake was located 30 km S of Mamuju, 68 km N of Majene and 1390 km E-NE of Jakarta, the capital of Indonesia, the epicenter of the second earthquake was located 12 km W 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 18:28:39.3 -3.11 119.28 220.0 27 5.9/18 GS RAS(Preliminary [2])
Federal research center, Geophysical survey of Russian Academy of Sciences
2 18:28:18.1 -2.94 118.93 20.0 365 Mw 6.2 21 CSEM(Verified [2])
European - Mediterranean seismological center
3 18:28:18.3 -2.98 118.9 18.0 126 Mw 6.2/22 6.0/99 28 NEIC(Verified [2])
National Earthquakes Information Center of US Geological Service
4 06:35:49.0 -2.92 119.0 20.0 56 5.1/24 6.0/34 6-6.5 78 GS RAS(Verified [1])
Federal research center, Geophysical survey of Russian Academy of Sciences
5 06:35:51.7 -3.0 119.16 33.0 16 6.0/14 6-6.5 GS RAS(Preliminary [1])
Federal research center, Geophysical survey of Russian Academy of Sciences
6 06:35:50.1 -2.9 118.92 19.1 245 Mw 5.7 31 CSEM(Verified [1])
European - Mediterranean seismological center
7 06:35:50.4 -2.97 118.89 18.8 99 Mw 5.7/25 5.9/99 33 NEIC(Verified [1])
National Earthquakes Information Center of US Geological Service
8 18:28:17.1 -2.94 118.89 20.0 55 5.9/32 6.3/31 7-7.5 94 GS RAS(Verified [2])
Federal research center, Geophysical survey of Russian Academy of Sciences