M4.7 Earthquake in the East Timor region — September 18, 2021
2021-09-18 18:29:00 UTC (2021-09-18) · approx. 3:29 AM UTC+9 local
Felt by 1 person across nearby locations. Aftershock of the M5.3 mainshock.
On September 18, 2021 at 18:29 UTC, a magnitude 4.7 shallow crustal earthquake struck in the East Timor region, at a depth of 10.0 km and coordinates -8.4040°, 127.8830°.
Physical scale: An earthquake of magnitude 4.7 releases seismic energy equivalent to roughly 169 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.1 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 10 days ago 83 km E of Lospalos, Timor Leste. 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.
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
127.8830°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.7 earthquake in the East Timor region?
The magnitude 4.7 earthquake that struck in the East Timor region on September 18, 2021 at 18:29 UTC had a depth of 10.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -8.4040°, 127.8830°, which is in the East Timor region.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.7 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 4.7 earthquake is an aftershock of the larger magnitude 5.3 mainshock that occurred earlier 83 km E of Lospalos, Timor Leste. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
Actions
Authoritative source: USGS event page (event ID: us7000fcgu). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 18, 2021). M4.7 Earthquake in the East Timor region — September 18, 2021. Retrieved December 3, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000fcgu/