M4.2 Earthquake 126 km SSW of Sofifi, Indonesia — April 20, 2021
2021-04-20 19:50:33 UTC (2021-04-20) · approx. 3:50 AM UTC+8 local
On April 20, 2021 at 19:50 UTC, a magnitude 4.2 shallow crustal earthquake struck 126 km SSW of Sofifi, Indonesia, at a depth of 16.1 km and coordinates -0.3776°, 127.2861°.
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
127.2861°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.2 earthquake near Sofifi, Indonesia?
The magnitude 4.2 earthquake that struck 126 km SSW of Sofifi, Indonesia on April 20, 2021 at 19:50 UTC had a depth of 16.1 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: us6000e51c). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, April 20, 2021). M4.2 Earthquake 126 km SSW of Sofifi, Indonesia — April 20, 2021. Retrieved July 3, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000e51c/