M4.6 Earthquake 46 km SSE of Pelabuhanratu, Indonesia — September 18, 2021
2021-09-18 23:38:49 UTC (2021-09-18) · approx. 6:38 AM UTC+7 local
Felt by 2 people across nearby locations.
On September 18, 2021 at 23:38 UTC, a magnitude 4.6 shallow crustal earthquake struck 46 km SSE of Pelabuhanratu, Indonesia, at a depth of 68.8 km and coordinates -7.3980°, 106.6382°.
Physical scale: An earthquake of magnitude 4.6 releases seismic energy equivalent to roughly 120 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 899 m — 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
106.6382°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.6 earthquake near Pelabuhanratu, Indonesia?
The magnitude 4.6 earthquake that struck 46 km SSE of Pelabuhanratu, Indonesia on September 18, 2021 at 23:38 UTC had a depth of 68.8 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -7.3980°, 106.6382°, which is 46 km SSE of Pelabuhanratu, Indonesia. View all earthquakes in Indonesia.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.6 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 4.6 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us7000fcis). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 18, 2021). M4.6 Earthquake 46 km SSE of Pelabuhanratu, Indonesia — September 18, 2021. Retrieved December 3, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000fcis/