How strong was the 115 km SSE of Perryville, Alaska earthquake?
The 115 km SSE of Perryville, Alaska earthquake had a magnitude of 5.6 mww, classified as a "Moderate" earthquake on the magnitude scale. Earthquakes of this magnitude can cause damage to poorly constructed buildings and are felt widely.
Where exactly did this earthquake occur and how deep was it?
This earthquake struck at coordinates 54.9056N, 158.7149W, at a depth of 25.0 km. This intermediate depth can still produce significant shaking at the surface.
Did this earthquake trigger a tsunami warning?
Yes, a tsunami advisory or warning was associated with this earthquake. Coastal residents in affected areas should always follow local emergency management guidance during tsunami events. Even small tsunamis can produce dangerous currents.
How many people felt this earthquake?
5 people submitted felt reports to the USGS for this earthquake. The Community Decimal Intensity (CDI) reached 3.4, indicating light shaking noticed by some people. The Modified Mercalli Intensity (MMI) was estimated at 3.9.
When did this earthquake happen and how significant was it?
This earthquake occurred on November 1, 2021 at 01:37:46. The USGS assigned it a significance score of 484 out of a possible 3,000, which factors in magnitude, felt reports, and potential impact. This is a moderately significant seismic event. The PAGER alert level was "green", indicating the estimated level of response needed.