M3.2 Earthquake 20 km NW of Challis, Idaho — April 26, 2023
2023-04-26 20:02:30 UTC (2023-04-26) · approx. 12:02 PM UTC-8 local
On April 26, 2023 at 20:02 UTC, a magnitude 3.2 shallow crustal earthquake struck 20 km NW of Challis, Idaho, at a depth of 15.3 km and coordinates 44.6587°, -114.3799°.
Physical scale: An earthquake of magnitude 3.2 releases seismic energy equivalent to roughly 951 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 97 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-114.3799°E
Technical Information
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Common Questions
How strong was the magnitude 3.2 earthquake near Challis, Idaho?
The magnitude 3.2 earthquake that struck 20 km NW of Challis, Idaho on April 26, 2023 at 20:02 UTC had a depth of 15.3 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 3.2 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.2 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000jw45). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, April 26, 2023). M3.2 Earthquake 20 km NW of Challis, Idaho — April 26, 2023. Retrieved January 18, 2024 from https://www.earthquaketracker.org/earthquakes/event/us7000jw45/