M4.1 Earthquake 115 km SSW of Singkil, Indonesia — September 30, 2021
2021-09-30 18:54:25 UTC (2021-09-30) · approx. 1:54 AM UTC+7 local
On September 30, 2021 at 18:54 UTC, a magnitude 4.1 shallow crustal earthquake struck 115 km SSW of Singkil, Indonesia, at a depth of 21.4 km and coordinates 1.2873°, 97.5015°.
Physical scale: An earthquake of magnitude 4.1 releases seismic energy equivalent to roughly 21 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 406 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
97.5015°E
Technical Information
Common Questions
How strong was the magnitude 4.1 earthquake near Singkil, Indonesia?
The magnitude 4.1 earthquake that struck 115 km SSW of Singkil, Indonesia on September 30, 2021 at 18:54 UTC had a depth of 21.4 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 4.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000fsa5). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 30, 2021). M4.1 Earthquake 115 km SSW of Singkil, Indonesia — September 30, 2021. Retrieved December 4, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000fsa5/