M4.9 Earthquake 68 km WSW of Labuan, Indonesia — June 21, 2025
2025-06-21 16:34:59 UTC (2025-06-21) · approx. 11:34 PM UTC+7 local
Felt by 1 person across nearby locations. Aftershock of the M5.3 mainshock.
On June 21, 2025 at 16:34 UTC, a magnitude 4.9 shallow crustal earthquake struck 68 km WSW of Labuan, Indonesia, at a depth of 62.4 km and coordinates -6.6156°, 105.2585°. This earthquake was detected by 90 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 370, 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.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.3 mainshock that occurred 17 days ago 87 km WSW of Labuan, Indonesia. Since the mainshock, the USGS has recorded 0 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
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 1 citizen response 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
105.2585°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.9 earthquake near Labuan, Indonesia?
The magnitude 4.9 earthquake that struck 68 km WSW of Labuan, Indonesia on June 21, 2025 at 16:34 UTC had a depth of 62.4 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -6.6156°, 105.2585°, which is 68 km WSW of Labuan, 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.
Is this the same earthquake as the M5.3 one earlier?
No. This magnitude 4.9 earthquake is an aftershock of the larger magnitude 5.3 mainshock that occurred earlier 87 km WSW of Labuan, Indonesia. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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: us6000qlmz). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, June 21, 2025). M4.9 Earthquake 68 km WSW of Labuan, Indonesia — June 21, 2025. Retrieved September 2, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000qlmz/