M4.9 Earthquake 104 km ENE of Georgetown, Saint Helena — June 12, 2022
2022-06-12 11:44:34 UTC (2022-06-12) · approx. 10:44 AM UTC-1 local
On June 12, 2022 at 11:44 UTC, a magnitude 4.9 shallow crustal earthquake struck 104 km ENE of Georgetown, Saint Helena, at a depth of 10.0 km and coordinates -7.6623°, -13.5021°. This earthquake was detected by 90 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 369, placing it among routine seismic activity.
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
-13.5021°E
Technical Information
Common Questions
How strong was the magnitude 4.9 earthquake near Georgetown, Saint Helena?
The magnitude 4.9 earthquake that struck 104 km ENE of Georgetown, Saint Helena on June 12, 2022 at 11:44 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 -7.6623°, -13.5021°, which is 104 km ENE of Georgetown, Saint Helena.
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
Authoritative source: USGS event page (event ID: us7000hgwy). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, June 12, 2022). M4.9 Earthquake 104 km ENE of Georgetown, Saint Helena — June 12, 2022. Retrieved August 21, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000hgwy/