M3.9 Earthquake 206 km W of Langlois, Oregon — July 30, 2025
2025-07-30 22:53:48 UTC (2025-07-30) · approx. 2:53 PM UTC-8 local
On July 30, 2025 at 22:53 UTC, a magnitude 3.9 shallow crustal earthquake struck 206 km W of Langlois, Oregon, at a depth of 10.0 km and coordinates 43.2393°, -126.9507°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 11 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 296 m — a useful intuition for the size of the slip patch on the fault.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.5 mainshock that occurred 24 days ago 226 km W of Langlois, Oregon. Since the mainshock, the USGS has recorded 5 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
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
-126.9507°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.9 earthquake near Langlois, Oregon?
The magnitude 3.9 earthquake that struck 206 km W of Langlois, Oregon on July 30, 2025 at 22:53 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 3.9 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.5 one earlier?
No. This magnitude 3.9 earthquake is an aftershock of the larger magnitude 5.5 mainshock that occurred earlier 226 km W of Langlois, Oregon. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000qwrj). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, July 30, 2025). M3.9 Earthquake 206 km W of Langlois, Oregon — July 30, 2025. Retrieved October 17, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000qwrj/