M4.5 Earthquake 68 km NE of Pototano, Indonesia — August 20, 2025
2025-08-20 17:28:58 UTC (2025-08-20) · approx. 1:28 AM UTC+8 local
On August 20, 2025 at 17:28 UTC, a magnitude 4.5 intermediate depth earthquake struck 68 km NE of Pototano, Indonesia, at a depth of 214.2 km and coordinates -8.0664°, 117.9992°. This earthquake was detected by 26 seismic stations with good location accuracy and was assigned a USGS significance rating of 312, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.5 releases seismic energy equivalent to roughly 85 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 767 m — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Indonesia, a region characterized by the convergence of the Indo-Australian, Eurasian, and Philippine Sea plates, forming the Sunda-Banda arc system. The nearest mapped fault system is the Sunda megathrust. View all earthquakes in Indonesia.
Learn more: Magnitude scale · Aftershock sequences
Earthquake Details
117.9992°E
Technical Information
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Common Questions
How strong was the magnitude 4.5 earthquake near Pototano, Indonesia?
The magnitude 4.5 earthquake that struck 68 km NE of Pototano, Indonesia on August 20, 2025 at 17:28 UTC had a depth of 214.2 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -8.0664°, 117.9992°, which is 68 km NE of Pototano, Indonesia. View all earthquakes in Indonesia.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.5 earthquakes can continue for several days and gradually diminish over time.
Has Indonesia had earthquakes this big before?
The largest recorded earthquake in Indonesia was the M9.1 Indian Ocean earthquake of December 26, 2004. Today's magnitude 4.5 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us6000r2k6). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, August 20, 2025). M4.5 Earthquake 68 km NE of Pototano, Indonesia — August 20, 2025. Retrieved November 12, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000r2k6/