M2.5 Earthquake 16 km NE of Kalama, Washington — October 20, 2020
2020-10-20 21:36:58 UTC (2020-10-20) · approx. 1:36 PM UTC-8 local
On October 20, 2020 at 21:36 UTC, a magnitude 2.5 shallow crustal earthquake struck 16 km NE of Kalama, Washington, at a depth of 13.7 km and coordinates 46.1128°, -122.6912°.
Physical scale: An earthquake of magnitude 2.5 releases seismic energy equivalent to roughly 71.4 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 30 m — a useful intuition for the size of the slip patch on the fault.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 5 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
-122.6912°E
Technical Information
Common Questions
How strong was the magnitude 2.5 earthquake near Kalama, Washington?
The magnitude 2.5 earthquake that struck 16 km NE of Kalama, Washington on October 20, 2020 at 21:36 UTC had a depth of 13.7 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 2.5 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 2.5 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: uw61684897). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, October 20, 2020). M2.5 Earthquake 16 km NE of Kalama, Washington — October 20, 2020. Retrieved December 29, 2020 from https://www.earthquaketracker.org/earthquakes/event/uw61684897/