M3.8 Earthquake 177 km W of Port Orford, Oregon — August 28, 2023
2023-08-28 17:40:56 UTC (2023-08-28) · approx. 9:40 AM UTC-8 local
On August 28, 2023 at 17:40 UTC, a magnitude 3.8 shallow crustal earthquake struck 177 km W of Port Orford, Oregon, at a depth of 10.0 km and coordinates 42.4689°, -126.6226°.
Physical scale: An earthquake of magnitude 3.8 releases seismic energy equivalent to roughly 7.6 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 252 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-126.6226°E
Technical Information
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Common Questions
How strong was the magnitude 3.8 earthquake near Port Orford, Oregon?
The magnitude 3.8 earthquake that struck 177 km W of Port Orford, Oregon on August 28, 2023 at 17:40 UTC had a depth of 10.0 km. For context, this was a minor earthquake typically detected only by instruments.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.8 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.8 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000kriw). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, August 28, 2023). M3.8 Earthquake 177 km W of Port Orford, Oregon — August 28, 2023. Retrieved January 18, 2024 from https://www.earthquaketracker.org/earthquakes/event/us7000kriw/