M4.1 Earthquake 226 km S of Sinabang, Indonesia — August 21, 2021
2021-08-21 23:15:55 UTC (2021-08-21) · approx. 5:15 AM UTC+6 local
On August 21, 2021 at 23:15 UTC, a magnitude 4.1 shallow crustal earthquake struck 226 km S of Sinabang, Indonesia, at a depth of 10.0 km and coordinates 0.4412°, 96.6042°.
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
96.6042°E
Technical Information
Common Questions
How strong was the magnitude 4.1 earthquake near Sinabang, Indonesia?
The magnitude 4.1 earthquake that struck 226 km S of Sinabang, Indonesia on August 21, 2021 at 23:15 UTC had a depth of 10.0 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 4.1 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: us7000f6pa). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 21, 2021). M4.1 Earthquake 226 km S of Sinabang, Indonesia — August 21, 2021. Retrieved November 2, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000f6pa/