M3.0 Earthquake 111 km SSE of Adak, Alaska — July 18, 2026
2026-07-18 00:35:35 UTC (3 days ago) · approx. 12:35 PM UTC-12 local
On July 18, 2026 at 00:35 UTC, a magnitude 3.0 shallow crustal earthquake struck 111 km SSE of Adak, Alaska, at a depth of 5.4 km and coordinates 50.9250°, -176.1020°.
Physical scale: An earthquake of magnitude 3.0 releases seismic energy equivalent to roughly 477 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 71 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-176.1020°E
Technical Information
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Common Questions
How strong was the magnitude 3.0 earthquake near Adak, Alaska?
The magnitude 3.0 earthquake that struck 111 km SSE of Adak, Alaska on July 18, 2026 at 00:35 UTC had a depth of 5.4 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 3.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.0 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: aka2026obtnka). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 18, 2026). M3.0 Earthquake 111 km SSE of Adak, Alaska — July 18, 2026. Retrieved July 21, 2026 from https://www.earthquaketracker.org/earthquakes/event/aka2026obtnka/