M4.1 Earthquake 28 km ENE of Sibolga, Indonesia — September 12, 2026
2026-09-12 21:35:46 UTC (2026-09-12) · approx. 4:35 AM UTC+7 local
On September 12, 2026 at 21:35 UTC, a magnitude 4.1 intermediate depth earthquake struck 28 km ENE of Sibolga, Indonesia, at a depth of 133.1 km and coordinates 1.8773°, 98.9972°.
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.
Earthquake Details
98.9972°E
Technical Information
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Common Questions
How strong was the magnitude 4.1 earthquake near Sibolga, Indonesia?
The magnitude 4.1 earthquake that struck 28 km ENE of Sibolga, Indonesia on September 12, 2026 at 21:35 UTC had a depth of 133.1 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.
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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: us7000ti4e). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, September 12, 2026). M4.1 Earthquake 28 km ENE of Sibolga, Indonesia — September 12, 2026. Retrieved October 3, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000ti4e/