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A micro magnitude 2.8 earthquake struck 131 km S of Unalaska, United States on Sunday, August 30, 2026 at 03:24:43 AM UTC. This shallow crustal event (12.3 km depth) released energy equivalent to approximately 239 kg of TNT. Here is the verified US telemetry, live epicenter map, and ground shaking assessment.
(131 km S of)2.8ML
Micro Seismic Class
12.3km
Crustal Layer
52.697° N, 166.549° W
GPS Coordinates
239 kg
TNT Equivalent Power
US
USGS Real-time Feed
A magnitude 2.8 event is classified as a micro earthquake. Micro-earthquakes are rarely felt by humans and are typically recorded only by sensitive seismometers.
Felt by almost no one except under extraordinarily favorable conditions.
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Earthquake strength is measured on a logarithmic scale. Compare this event with the full seismic scale:
Because seismic scales are logarithmic, each whole integer increase represents:
The western North American margin is shaped by the Pacific Ring of Fire, including the 800-mile San Andreas transform fault system and the Cascadia Subduction Zone. Lateral strike-slip motion between the Pacific and North American plates drives continuous crustal deformation across the region.
Originating at a depth of 12.3 km (Earth's Crust (0–70 km)), this rupture occurred occurred within the brittle upper crust. shallow earthquakes produce the highest peak ground acceleration and the sharpest surface shaking.
Micro-tremors and minor events of this scale are part of ongoing background tectonic relaxation. While isolated micro-aftershocks may occur, the likelihood of a damaging secondary event remains statistically low under normal seismic conditions.
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