M4.3 Earthquake 103 km ENE of Amahai, Indonesia — August 18, 2021
2021-08-18 23:22:32 UTC (2021-08-18) · approx. 8:22 AM UTC+9 local
On August 18, 2021 at 23:22 UTC, a magnitude 4.3 shallow crustal earthquake struck 103 km ENE of Amahai, Indonesia, at a depth of 10.0 km and coordinates -3.1292°, 129.8249°.
Physical scale: An earthquake of magnitude 4.3 releases seismic energy equivalent to roughly 43 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 558 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
129.8249°E
Technical Information
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Common Questions
How strong was the magnitude 4.3 earthquake near Amahai, Indonesia?
The magnitude 4.3 earthquake that struck 103 km ENE of Amahai, Indonesia on August 18, 2021 at 23:22 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 4.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000f4xw). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 18, 2021). M4.3 Earthquake 103 km ENE of Amahai, Indonesia — August 18, 2021. Retrieved October 29, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000f4xw/