M2.2 Earthquake 10 km NNE of Startup, Washington — July 31, 2026
2026-07-31 07:37:54 UTC (2026-07-31) · approx. 11:37 PM UTC-8 local
On July 31, 2026 at 07:37 UTC, a magnitude 2.2 shallow crustal earthquake struck 10 km NNE of Startup, Washington, at a depth of -0.3 km and coordinates 47.9580°, -121.7013°.
Physical scale: An earthquake of magnitude 2.2 releases seismic energy equivalent to roughly 29.1 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 20 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 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
-121.7013°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 2.2 earthquake near Startup, Washington?
The magnitude 2.2 earthquake that struck 10 km NNE of Startup, Washington on July 31, 2026 at 07:37 UTC had a depth of -0.3 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 2.2 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 2.2 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: uw714066821). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 31, 2026). M2.2 Earthquake 10 km NNE of Startup, Washington — July 31, 2026. Retrieved July 31, 2026 from https://www.earthquaketracker.org/earthquakes/event/uw714066821/