How strong was the 99 km ESE of Chignik, Alaska earthquake?
The 99 km ESE of Chignik, Alaska earthquake had a magnitude of 5.7 mb, 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 55.8758N, 156.9924W, at a depth of 35.0 km. This intermediate depth can still produce significant shaking at the surface.
Did this earthquake trigger a tsunami warning?
No tsunami warning was issued for this earthquake. Earthquakes below magnitude 6.5 rarely generate dangerous tsunamis, though localized effects are possible in rare cases.
How many people felt this earthquake?
No felt reports were submitted to the USGS for this earthquake. This may indicate the earthquake occurred in a remote area with few nearby residents, or the shaking was too minor to be widely noticed.
When did this earthquake happen and how significant was it?
This earthquake occurred on July 29, 2021 at 15:23:02. The USGS assigned it a significance score of 500 out of a possible 3,000, which factors in magnitude, felt reports, and potential impact. This is a moderately significant seismic event.