M4.2 Earthquake 295 km W of Adak, Alaska — July 10, 2020
2020-07-10 23:13:23 UTC (2020-07-10) · approx. 11:13 AM UTC+12 local
On July 10, 2020 at 23:13 UTC, a magnitude 4.2 intermediate depth earthquake struck 295 km W of Adak, Alaska, at a depth of 175.1 km and coordinates 52.2341°, 179.0945°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
179.0945°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.2 earthquake near Adak, Alaska?
The magnitude 4.2 earthquake that struck 295 km W of Adak, Alaska on July 10, 2020 at 23:13 UTC had a depth of 175.1 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.2 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000alqf). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, July 10, 2020). M4.2 Earthquake 295 km W of Adak, Alaska — July 10, 2020. Retrieved September 19, 2020 from https://www.earthquaketracker.org/earthquakes/event/us7000alqf/