M4.7 Earthquake 87 km ENE of Georgetown, Saint Helena — June 11, 2022
2022-06-11 19:01:31 UTC (2022-06-11) · approx. 6:01 PM UTC-1 local
On June 11, 2022 at 19:01 UTC, a magnitude 4.7 shallow crustal earthquake struck 87 km ENE of Georgetown, Saint Helena, at a depth of 10.0 km and coordinates -7.7001°, -13.6486°. This earthquake was detected by 26 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 340, placing it among routine seismic activity.
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
-13.6486°E
Technical Information
Common Questions
How strong was the magnitude 4.7 earthquake near Georgetown, Saint Helena?
The magnitude 4.7 earthquake that struck 87 km ENE of Georgetown, Saint Helena on June 11, 2022 at 19:01 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 -7.7001°, -13.6486°, which is 87 km ENE of Georgetown, Saint Helena.
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: us7000hhtt). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, June 11, 2022). M4.7 Earthquake 87 km ENE of Georgetown, Saint Helena — June 11, 2022. Retrieved August 21, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000hhtt/