M4.0 Earthquake 43 km SSE of Acajutla, El Salvador — September 26, 2021
2021-09-26 21:15:39 UTC (2021-09-26) · approx. 3:15 PM UTC-6 local
On September 26, 2021 at 21:15 UTC, a magnitude 4.0 shallow crustal earthquake struck 43 km SSE of Acajutla, El Salvador, at a depth of 35.0 km and coordinates 13.2423°, -89.6474°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-89.6474°E
Technical Information
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Common Questions
How strong was the magnitude 4.0 earthquake near Acajutla, El Salvador?
The magnitude 4.0 earthquake that struck 43 km SSE of Acajutla, El Salvador on September 26, 2021 at 21:15 UTC had a depth of 35.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000fpwc). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 26, 2021). M4.0 Earthquake 43 km SSE of Acajutla, El Salvador — September 26, 2021. Retrieved December 4, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000fpwc/