M3.7 Earthquake 77 km SW of Unalaska, Alaska — April 4, 2024
2024-04-04 19:59:06 UTC (2024-04-04) · approx. 8:59 AM UTC-11 local
On April 4, 2024 at 19:59 UTC, a magnitude 3.7 intermediate depth earthquake struck 77 km SW of Unalaska, Alaska, at a depth of 87.1 km and coordinates 53.3623°, -167.3170°.
Physical scale: An earthquake of magnitude 3.7 releases seismic energy equivalent to roughly 5.4 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 215 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 1 citizen response 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
-167.3170°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.7 earthquake near Unalaska, Alaska?
The magnitude 3.7 earthquake that struck 77 km SW of Unalaska, Alaska on April 4, 2024 at 19:59 UTC had a depth of 87.1 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 3.7 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.7 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000m9yu). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2024, April 4, 2024). M3.7 Earthquake 77 km SW of Unalaska, Alaska — April 4, 2024. Retrieved June 12, 2024 from https://www.earthquaketracker.org/earthquakes/event/us7000m9yu/