M4.2 Earthquake 73 km NE of Mamuju, Indonesia — October 27, 2020
2020-10-27 21:00:39 UTC (2020-10-27) · approx. 5:00 AM UTC+8 local
On October 27, 2020 at 21:00 UTC, a magnitude 4.2 shallow crustal earthquake struck 73 km NE of Mamuju, Indonesia, at a depth of 13.0 km and coordinates -2.1839°, 119.3317°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
119.3317°E
Technical Information
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Common Questions
How strong was the magnitude 4.2 earthquake near Mamuju, Indonesia?
The magnitude 4.2 earthquake that struck 73 km NE of Mamuju, Indonesia on October 27, 2020 at 21:00 UTC had a depth of 13.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.2 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000c831). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, October 27, 2020). M4.2 Earthquake 73 km NE of Mamuju, Indonesia — October 27, 2020. Retrieved January 9, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000c831/