M5.1 Earthquake 158 km SW of Labuan, Indonesia — March 21, 2026
2026-03-21 18:08:53 UTC (2026-03-21) · approx. 1:08 AM UTC+7 local
Felt by 2 people across nearby locations.
On March 21, 2026 at 18:08 UTC, a magnitude 5.1 shallow crustal earthquake struck 158 km SW of Labuan, Indonesia, at a depth of 10.0 km and coordinates -7.5504°, 105.0028°. This earthquake was detected by 157 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 401, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 5.1 releases seismic energy equivalent to roughly 674 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 2.0 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
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 2 citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
105.0028°E
Technical Information
Common Questions
How strong was the magnitude 5.1 earthquake near Labuan, Indonesia?
The magnitude 5.1 earthquake that struck 158 km SW of Labuan, Indonesia on March 21, 2026 at 18:08 UTC had a depth of 10.0 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at -7.5504°, 105.0028°, which is 158 km SW of Labuan, Indonesia. View all earthquakes in Indonesia.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.1 earthquakes can continue for days to weeks 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 5.1 event is significantly smaller than that historical record.
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.
Authoritative source: USGS event page (event ID: us6000si8m). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, March 21, 2026). M5.1 Earthquake 158 km SW of Labuan, Indonesia — March 21, 2026. Retrieved May 13, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000si8m/