M4.9 Earthquake 83 km E of Georgetown, Saint Helena — June 20, 2022
2022-06-20 10:32:53 UTC (2022-06-20) · approx. 9:32 AM UTC-1 local
On June 20, 2022 at 10:32 UTC, a magnitude 4.9 shallow crustal earthquake struck 83 km E of Georgetown, Saint Helena, at a depth of 10.0 km and coordinates -7.8026°, -13.6616°. This earthquake was detected by 34 seismic stations with good 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
-13.6616°E
Technical Information
Common Questions
How strong was the magnitude 4.9 earthquake near Georgetown, Saint Helena?
The magnitude 4.9 earthquake that struck 83 km E of Georgetown, Saint Helena on June 20, 2022 at 10:32 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 -7.8026°, -13.6616°, which is 83 km E 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: us7000hipq). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, June 20, 2022). M4.9 Earthquake 83 km E of Georgetown, Saint Helena — June 20, 2022. Retrieved August 28, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000hipq/