M4.9 Earthquake 27 km NW of Kotabumi, Indonesia — August 28, 2025
2025-08-28 02:15:41 UTC (2025-08-28) · approx. 9:15 AM UTC+7 local
On August 28, 2025 at 02:15 UTC, a magnitude 4.9 intermediate depth earthquake struck 27 km NW of Kotabumi, Indonesia, at a depth of 193.1 km and coordinates -4.6311°, 104.7303°. This earthquake was detected by 85 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 369, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.9 releases seismic energy equivalent to roughly 338 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.4 km — 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
104.7303°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.9 earthquake near Kotabumi, Indonesia?
The magnitude 4.9 earthquake that struck 27 km NW of Kotabumi, Indonesia on August 28, 2025 at 02:15 UTC had a depth of 193.1 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -4.6311°, 104.7303°, which is 27 km NW of Kotabumi, Indonesia. View all earthquakes in Indonesia.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.9 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 4.9 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us7000qrh6). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, August 28, 2025). M4.9 Earthquake 27 km NW of Kotabumi, Indonesia — August 28, 2025. Retrieved November 19, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000qrh6/