M4.0 Earthquake south of Sumbawa, Indonesia — January 18, 2021
2021-01-18 21:33:52 UTC (2021-01-18) · approx. 5:33 AM UTC+8 local
On January 18, 2021 at 21:33 UTC, a magnitude 4.0 shallow crustal earthquake struck south of Sumbawa, Indonesia, at a depth of 10.0 km and coordinates -11.3297°, 117.7775°.
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
117.7775°E
Technical Information
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Common Questions
How strong was the magnitude 4.0 earthquake south of Sumbawa, Indonesia?
The magnitude 4.0 earthquake that struck south of Sumbawa, Indonesia on January 18, 2021 at 21:33 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.
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Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000d3py). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, January 18, 2021). M4.0 Earthquake south of Sumbawa, Indonesia — January 18, 2021. Retrieved March 27, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000d3py/