Light mag. 3.7 earthquake - 30 km south of Mamuju, Sulawesi Barat, Indonesia, on Monday, 18 Jan 2021 12:11 pm (GMT +8) -
This quake was likely an aftershock of the 6.2 quake 34 km south of Mamuju, Sulawesi Barat, Indonesia, 15 Jan 2021 2:28 am (GMT +8), which had occurred 3 days earlier.
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Light magnitude 3.7 earthquake at 13 km depth
18 Jan 04:15 UTC: First to report: BMKG after 4 minutes.
18 Jan 04:20: Magnitude recalculated from 3.6 to 3.7.
18 Jan 04:20: Magnitude recalculated from 3.6 to 3.7.
Date & time: 18 Jan 2021 04:11:17 UTC -
Local time at epicenter: Monday, 18 Jan 2021 12:11 pm (GMT +8)
Magnitude: 3.7
Depth: 13.0 km
Epicenter latitude / longitude: 2.94°S / 118.97°E

Nearby towns and cities:
30 km (19 mi) SSE of Mamuju (pop: 15,000) --> See nearby quakes!
67 km (41 mi) N of Majene (pop: 37,700) --> See nearby quakes!
69 km (43 mi) NW of Polewali (pop: 58,200) --> See nearby quakes!
103 km (64 mi) W of Rantepao (pop: 40,400) --> See nearby quakes!
136 km (85 mi) W of Palopo (pop: 129,300) --> See nearby quakes!
140 km (87 mi) NNW of Parepare (pop: 140,000) --> See nearby quakes!
177 km (110 mi) NW of Sengkang (pop: 59,500) --> See nearby quakes!
247 km (154 mi) SSW of Palu (pop: 282,400) --> See nearby quakes!
251 km (156 mi) NNW of Makassar (pop: 1,321,700) --> See nearby quakes!
298 km (185 mi) SE of City of Balikpapan (pop: 700,000) --> See nearby quakes!
Weather at epicenter at time of quake:
Light Rain
27.1°C (81 F), humidity: 61%, wind: 1 m/s (3 kts) from WSW
Primary data source: BMKG (Meteorological, Climatological, and Geophysical Agency of Indonesia)Light Rain

Estimated released energy: 2.2 x 1010 joules (6.22 megawatt hours, equivalent to 5.35 tons of TNT) More info
Data for the same earthquake reported by different agencies
Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
Magnitude | Depth | Location | Source |
M 3.7 | 13 km | Sulawesi, Indonesia | BMKG |
M 3.6 | 13 km | SULAWESI, INDONESIA | EMSC |
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