M4.1 Earthquake 226 km SSE of Amahai, Indonesia — October 17, 2025
2025-10-17 20:30:02 UTC (2025-10-17) · approx. 5:30 AM UTC+9 local
On October 17, 2025 at 20:30 UTC, a magnitude 4.1 intermediate depth earthquake struck 226 km SSE of Amahai, Indonesia, at a depth of 236.9 km and coordinates -5.2184°, 129.7433°.
Physical scale: An earthquake of magnitude 4.1 releases seismic energy equivalent to roughly 21 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 406 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 5.5 mainshock that occurred 8 days ago 207 km SSE of Amahai, 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
129.7433°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.1 earthquake near Amahai, Indonesia?
The magnitude 4.1 earthquake that struck 226 km SSE of Amahai, Indonesia on October 17, 2025 at 20:30 UTC had a depth of 236.9 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 4.1 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.5 one earlier?
No. This magnitude 4.1 earthquake is an aftershock of the larger magnitude 5.5 mainshock that occurred earlier 207 km SSE of Amahai, Indonesia. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000rhyg). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, October 17, 2025). M4.1 Earthquake 226 km SSE of Amahai, Indonesia — October 17, 2025. Retrieved January 9, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000rhyg/