M4.0 Earthquake 68 km E of Amahai, Indonesia — August 25, 2021
2021-08-25 22:04:25 UTC (2021-08-25) · approx. 7:04 AM UTC+9 local
On August 25, 2021 at 22:04 UTC, a magnitude 4.0 shallow crustal earthquake struck 68 km E of Amahai, Indonesia, at a depth of 10.0 km and coordinates -3.4006°, 129.5316°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
129.5316°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.0 earthquake near Amahai, Indonesia?
The magnitude 4.0 earthquake that struck 68 km E of Amahai, Indonesia on August 25, 2021 at 22:04 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 4.0 earthquakes can continue for several days and gradually diminish over time.
Actions
Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000f7h3). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 25, 2021). M4.0 Earthquake 68 km E of Amahai, Indonesia — August 25, 2021. Retrieved November 2, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000f7h3/