M4.0 Earthquake near Kepulauan Barat Daya, Indonesia — March 29, 2023
2023-03-29 23:38:38 UTC (2023-03-29) · approx. 8:38 AM UTC+9 local
On March 29, 2023 at 23:38 UTC, a magnitude 4.0 intermediate depth earthquake struck near Kepulauan Barat Daya, Indonesia, at a depth of 148.3 km and coordinates -7.3196°, 128.5809°.
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.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.1 mainshock that occurred 24 days ago 173 km NE of Lospalos, Timor Leste. Since the mainshock, the USGS has recorded 0 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
128.5809°E
Technical Information
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Common Questions
How strong was the magnitude 4.0 earthquake near Kepulauan Barat Daya, Indonesia?
The magnitude 4.0 earthquake that struck near Kepulauan Barat Daya, Indonesia on March 29, 2023 at 23:38 UTC had a depth of 148.3 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.
Is this the same earthquake as the M5.1 one earlier?
No. This magnitude 4.0 earthquake is an aftershock of the larger magnitude 5.1 mainshock that occurred earlier 173 km NE of Lospalos, Timor Leste. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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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: us6000k1rv). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, March 29, 2023). M4.0 Earthquake near Kepulauan Barat Daya, Indonesia — March 29, 2023. Retrieved June 3, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000k1rv/