M4.9 Earthquake 128 km WSW of Port Orford, Oregon — August 6, 2026
2026-08-06 09:55:40 UTC (1 hour ago) · approx. 1:55 AM UTC-8 local
On August 6, 2026 at 09:55 UTC, a magnitude 4.9 shallow crustal earthquake struck 128 km WSW of Port Orford, Oregon, at a depth of 10.0 km and coordinates 42.4079°, -125.9976°. This earthquake was detected by 23 seismic stations with moderate location accuracy and was assigned a USGS significance rating of 369, placing it among routine seismic activity.
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.
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
Earthquake Details
-125.9976°E
Technical Information
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Common Questions
How strong was the magnitude 4.9 earthquake near Port Orford, Oregon?
The magnitude 4.9 earthquake that struck 128 km WSW of Port Orford, Oregon on August 6, 2026 at 09:55 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 42.4079°, -125.9976°, which is 128 km WSW of Port Orford, Oregon. View all earthquakes in Oregon.
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.
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 4.9 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us6000tij5). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, August 6, 2026). M4.9 Earthquake 128 km WSW of Port Orford, Oregon — August 6, 2026. Retrieved August 6, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000tij5/