M4.1 Earthquake 138 km ESE of Modisi, Indonesia — April 13, 2026
2026-04-13 18:48:41 UTC (2026-04-13) · approx. 2:48 AM UTC+8 local
On April 13, 2026 at 18:48 UTC, a magnitude 4.1 shallow crustal earthquake struck 138 km ESE of Modisi, Indonesia, at a depth of 35.0 km and coordinates 0.0020°, 125.5984°.
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 5.0 mainshock that occurred 27 days ago 140 km SSE of Bitung, Indonesia. Since the mainshock, the USGS has recorded 2 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
125.5984°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.1 earthquake near Modisi, Indonesia?
The magnitude 4.1 earthquake that struck 138 km ESE of Modisi, Indonesia on April 13, 2026 at 18:48 UTC had a depth of 35.0 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 M5.0 one earlier?
No. This magnitude 4.1 earthquake is an aftershock of the larger magnitude 5.0 mainshock that occurred earlier 140 km SSE of Bitung, Indonesia. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
What should I do after an earthquake?
If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.
Actions
Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000ss3v). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, April 13, 2026). M4.1 Earthquake 138 km ESE of Modisi, Indonesia — April 13, 2026. Retrieved May 15, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000ss3v/