M4.9 Earthquake 274 km NE of Santa Cruz das Flores, Portugal — September 28, 2020
2020-09-28 12:26:50 UTC (2020-09-28) · approx. 10:26 AM UTC-2 local
On September 28, 2020 at 12:26 UTC, a magnitude 4.9 shallow crustal earthquake struck 274 km NE of Santa Cruz das Flores, Portugal, at a depth of 10.0 km and coordinates 41.5045°, -29.3079°.
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
-29.3079°E
Technical Information
Common Questions
How strong was the magnitude 4.9 earthquake near Santa Cruz das Flores, Portugal?
The magnitude 4.9 earthquake that struck 274 km NE of Santa Cruz das Flores, Portugal on September 28, 2020 at 12:26 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 41.5045°, -29.3079°, which is 274 km NE of Santa Cruz das Flores, Portugal.
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.
Authoritative source: USGS event page (event ID: us6000c24x). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, September 28, 2020). M4.9 Earthquake 274 km NE of Santa Cruz das Flores, Portugal — September 28, 2020. Retrieved December 5, 2020 from https://www.earthquaketracker.org/earthquakes/event/us6000c24x/