M4.2 Earthquake 172 km WNW of Abepura, Indonesia — December 28, 2023
2023-12-28 22:22:13 UTC (2023-12-28) · approx. 7:22 AM UTC+9 local
On December 28, 2023 at 22:22 UTC, a magnitude 4.2 shallow crustal earthquake struck 172 km WNW of Abepura, Indonesia, at a depth of 32.3 km and coordinates -2.2530°, 139.1225°.
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 26 days ago 199 km W of Abepura, Indonesia. Since the mainshock, the USGS has recorded 28 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
139.1225°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.2 earthquake near Abepura, Indonesia?
The magnitude 4.2 earthquake that struck 172 km WNW of Abepura, Indonesia on December 28, 2023 at 22:22 UTC had a depth of 32.3 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 4.2 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 199 km W of Abepura, 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: us6000m2if). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, December 28, 2023). M4.2 Earthquake 172 km WNW of Abepura, Indonesia — December 28, 2023. Retrieved March 2, 2024 from https://www.earthquaketracker.org/earthquakes/event/us6000m2if/