M4.9 Earthquake 23 km SSE of Cikarang, Indonesia — August 20, 2025
2025-08-20 12:54:54 UTC (2025-08-20) · approx. 7:54 PM UTC+7 local
Felt by 72 people across nearby locations.
On August 20, 2025 at 12:54 UTC, a magnitude 4.9 shallow crustal earthquake struck 23 km SSE of Cikarang, Indonesia, at a depth of 9.6 km and coordinates -6.4631°, 107.2303°. This earthquake was detected by 65 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 413, 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
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 72 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
107.2303°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.9 earthquake near Cikarang, Indonesia?
The magnitude 4.9 earthquake that struck 23 km SSE of Cikarang, Indonesia on August 20, 2025 at 12:54 UTC had a depth of 9.6 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -6.4631°, 107.2303°, which is 23 km SSE of Cikarang, 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: us6000r2b3). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, August 20, 2025). M4.9 Earthquake 23 km SSE of Cikarang, Indonesia — August 20, 2025. Retrieved November 12, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000r2b3/