M4.7 Earthquake in the Tristan da Cunha region — October 18, 2021
2021-10-18 19:47:15 UTC (2021-10-18) · approx. 6:47 PM UTC-1 local
On October 18, 2021 at 19:47 UTC, a magnitude 4.7 shallow crustal earthquake struck in the Tristan da Cunha region, at a depth of 10.0 km and coordinates -34.3652°, -14.8150°.
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.
Earthquake Details
-14.8150°E
Technical Information
Common Questions
How strong was the magnitude 4.7 earthquake in the Tristan da Cunha region?
The magnitude 4.7 earthquake that struck in the Tristan da Cunha region on October 18, 2021 at 19:47 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 -34.3652°, -14.8150°, which is in the Tristan da Cunha 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.
Actions
Authoritative source: USGS event page (event ID: us6000fwqv). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, October 18, 2021). M4.7 Earthquake in the Tristan da Cunha region — October 18, 2021. Retrieved December 25, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000fwqv/