M4.2 Earthquake 146 km SSW of Muncar, Indonesia — August 6, 2023
2023-08-06 22:28:09 UTC (2023-08-06) · approx. 6:28 AM UTC+8 local
On August 6, 2023 at 22:28 UTC, a magnitude 4.2 shallow crustal earthquake struck 146 km SSW of Muncar, Indonesia, at a depth of 41.7 km and coordinates -9.7250°, 114.0347°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 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 1 hour ago 119 km SSW of Gambiran Satu, Indonesia. 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
114.0347°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.2 earthquake near Muncar, Indonesia?
The magnitude 4.2 earthquake that struck 146 km SSW of Muncar, Indonesia on August 6, 2023 at 22:28 UTC had a depth of 41.7 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 4.2 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 4.2 earthquake is an aftershock of the larger magnitude 5.1 mainshock that occurred earlier 119 km SSW of Gambiran Satu, Indonesia. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000l03u). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, August 6, 2023). M4.2 Earthquake 146 km SSW of Muncar, Indonesia — August 6, 2023. Retrieved October 17, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000l03u/