M3.2 Earthquake 3 km ESE of Rose Lodge, Oregon — July 21, 2020
2020-07-21 23:39:16 UTC (2020-07-21) · approx. 3:39 PM UTC-8 local
Felt by 34 people across nearby locations.
On July 21, 2020 at 23:39 UTC, a magnitude 3.2 shallow crustal earthquake struck 3 km ESE of Rose Lodge, Oregon, at a depth of 44.0 km and coordinates 44.9932°, -123.8420°. The earthquake was reported felt by 34 peopleacross nearby locations, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 3.0 (light). This earthquake was detected by 40 seismic stations with good location accuracy and was assigned a USGS significance rating of 168, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 3.2 releases seismic energy equivalent to roughly 858 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 93 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
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 34 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
-123.8420°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.2 earthquake near Rose Lodge, Oregon?
The magnitude 3.2 earthquake that struck 3 km ESE of Rose Lodge, Oregon on July 21, 2020 at 23:39 UTC had a depth of 44.0 km. It was felt by 34 people with maximum shaking intensity of MMI 3.0 (light). For context, this was a minor earthquake typically detected only by instruments.
Where did the earthquake occur?
The earthquake epicenter was located at 44.9932°, -123.8420°, which is 3 km ESE of Rose Lodge, Oregon. View all earthquakes in Oregon.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.2 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 3.2 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: uw61661241). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, July 21, 2020). M3.2 Earthquake 3 km ESE of Rose Lodge, Oregon — July 21, 2020. Retrieved September 26, 2020 from https://www.earthquaketracker.org/earthquakes/event/uw61661241/