M4.9 Earthquake near southeast Indian Ridge — September 21, 2021
2021-09-21 03:29:13 UTC (2021-09-21) · approx. 10:29 AM UTC+7 local
On September 21, 2021 at 03:29 UTC, a magnitude 4.9 shallow crustal earthquake struck near southeast Indian Ridge, at a depth of 10.0 km and coordinates -49.7314°, 109.9732°.
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.
Earthquake Details
109.9732°E
Technical Information
Common Questions
How strong was the magnitude 4.9 earthquake near southeast Indian Ridge?
The magnitude 4.9 earthquake that struck near southeast Indian Ridge on September 21, 2021 at 03:29 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 -49.7314°, 109.9732°, which is near southeast Indian Ridge.
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.
Actions
Location
Authoritative source: USGS event page (event ID: us7000fe48). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 21, 2021). M4.9 Earthquake near southeast Indian Ridge — September 21, 2021. Retrieved December 3, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000fe48/