The 1957 Atka, Alaska Earthquake occurred on 9 March 1957, registering a moment magnitude ($ ext{mw}$) of 8.6. According to the United States Geological Survey (USGS) Earthquake Catalog, the event generated an automatic status record with a significance value of 1138 and a maximum Modified Mercalli Intensity (MMI) of 7.043.
Location and Depth Measurements
The earthquake was centered in the Atka region of Alaska. The hypocenter was located at a depth of 25.0 kilometers, with geographic coordinates of latitude 51.499 and longitude -175.626.
Event Classification and Catalog Details
In earthquake seismology catalogs, this event is classified under the event identifier official19570309142233_30. The catalog record notes that the tsunami flag for this entry is false, indicating that a tsunami flag was not triggered under the specific parameters of this automatic entry. The data reflects an automatic status within the USGS system.
Frequently asked questions
When did the 1957 Atka, Alaska earthquake happen?
The earthquake occurred on 9 March 1957.
What was the magnitude of the earthquake?
The earthquake had a moment magnitude of 8.6.
What was the depth of the earthquake?
The focal depth was recorded at 25.0 kilometers.
Where was the epicenter located?
The epicenter was located at latitude 51.499 and longitude -175.626.
Sources and further context
Official datasets support the event-specific facts.