M4.1 Earthquake near off the coast of Washington — September 22, 2020
2020-09-22 23:25:49 UTC (2020-09-22) · approx. 2:25 PM UTC-9 local
On September 22, 2020 at 23:25 UTC, a magnitude 4.1 shallow crustal earthquake struck near off the coast of Washington, at a depth of 10.0 km and coordinates 47.3609°, -129.0216°.
Physical scale: An earthquake of magnitude 4.1 releases seismic energy equivalent to roughly 21 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 406 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-129.0216°E
Technical Information
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Common Questions
How strong was the magnitude 4.1 earthquake near off the coast of Washington?
The magnitude 4.1 earthquake that struck near off the coast of Washington on September 22, 2020 at 23:25 UTC had a depth of 10.0 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 4.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000bzw1). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, September 22, 2020). M4.1 Earthquake near off the coast of Washington — September 22, 2020. Retrieved November 28, 2020 from https://www.earthquaketracker.org/earthquakes/event/us6000bzw1/