M4.8 Earthquake 153 km NNE of Jamestown, Saint Helena — July 28, 2022
2022-07-28 07:13:52 UTC (2022-07-28) · approx. 7:13 AM UTC+0 local
On July 28, 2022 at 07:13 UTC, a magnitude 4.8 shallow crustal earthquake struck 153 km NNE of Jamestown, Saint Helena, at a depth of 10.0 km and coordinates -14.6731°, -5.1273°. This earthquake was detected by 70 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 354, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.8 releases seismic energy equivalent to roughly 239 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.2 km — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-5.1273°E
Technical Information
Common Questions
How strong was the magnitude 4.8 earthquake near Jamestown, Saint Helena?
The magnitude 4.8 earthquake that struck 153 km NNE of Jamestown, Saint Helena on July 28, 2022 at 07:13 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 -14.6731°, -5.1273°, which is 153 km NNE of Jamestown, Saint Helena.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.8 earthquakes can continue for several days and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us6000i640). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, July 28, 2022). M4.8 Earthquake 153 km NNE of Jamestown, Saint Helena — July 28, 2022. Retrieved October 1, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000i640/