M4.5 Earthquake near off the coast of Oregon — August 24, 2023
2023-08-24 23:18:12 UTC (2023-08-24) · approx. 2:18 PM UTC-9 local
Felt by 4 people across nearby locations.
On August 24, 2023 at 23:18 UTC, a magnitude 4.5 shallow crustal earthquake struck near off the coast of Oregon, at a depth of 13.9 km and coordinates 44.0324°, -128.7182°. This earthquake was detected by 100 seismic stations with good location accuracy and was assigned a USGS significance rating of 313, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.5 releases seismic energy equivalent to roughly 85 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 767 m — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Oregon, a region characterized by the southern Cascadia Subduction Zone, with additional seismicity from crustal faults in the Willamette Valley. The nearest mapped fault system is the Cascadia Subduction Zone. View all earthquakes in Oregon.
Learn more: Cascadia Subduction Zone · Magnitude scale · Aftershock sequences
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 4 citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
-128.7182°E
Technical Information
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Common Questions
How strong was the magnitude 4.5 earthquake near off the coast of Oregon?
The magnitude 4.5 earthquake that struck near off the coast of Oregon on August 24, 2023 at 23:18 UTC had a depth of 13.9 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 44.0324°, -128.7182°, which is near off the coast of Oregon. View all earthquakes in Oregon.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.5 earthquakes can continue for several days and gradually diminish over time.
Has Oregon had earthquakes this big before?
The largest recorded earthquake in Oregon was the M7.3 offshore Brookings earthquake of November 23, 1873. Today's magnitude 4.5 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us7000kqu5). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, August 24, 2023). M4.5 Earthquake near off the coast of Oregon — August 24, 2023. Retrieved October 28, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000kqu5/