M4.6 Earthquake 76 km NE of Georgetown, Saint Helena — October 16, 2022
2022-10-16 18:07:41 UTC (2022-10-16) · approx. 5:07 PM UTC-1 local
On October 16, 2022 at 18:07 UTC, a magnitude 4.6 shallow crustal earthquake struck 76 km NE of Georgetown, Saint Helena, at a depth of 10.0 km and coordinates -7.3654°, -14.0040°. This earthquake was detected by 12 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 326, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.6 releases seismic energy equivalent to roughly 120 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 899 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-14.0040°E
Technical Information
Common Questions
How strong was the magnitude 4.6 earthquake near Georgetown, Saint Helena?
The magnitude 4.6 earthquake that struck 76 km NE of Georgetown, Saint Helena on October 16, 2022 at 18:07 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 -7.3654°, -14.0040°, which is 76 km NE of Georgetown, Saint Helena.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.6 earthquakes can continue for several days and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us6000ivaa). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, October 16, 2022). M4.6 Earthquake 76 km NE of Georgetown, Saint Helena — October 16, 2022. Retrieved December 31, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000ivaa/