Data last collected:
QuakeFactsEvidence report · prepared 23 October 2026https://quakes99.com/entity/iscgem788547
USGS iscgem788547
25 Jan 1971, 17:08
92 km WSW of Adak, Alaska
A magnitude 6.4 mw earthquake at 40 km depth.
Published location
Where is 92 km WSW of Adak, Alaska?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
51.449000, -177.778000
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What the numbers mean
Magnitude measures event size; depth locates the source below the surface. Neither value alone establishes local damage or personal risk.
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Nearby events with a similar magnitude
Catalog fields and provenance
Event ID
iscgem788547
Coordinates
51.449, -177.778
Network
iscgem
Significance
630
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Questions this evidence can answer
01What exactly is this record?
Use the name, place, date and identifiers above to confirm that you have the right 92 km WSW of Adak, Alaska earthquake: magnitude 6.4 and depth | QuakeFacts record.
02What does the evidence establish?
Read the reported values with their units, coverage dates and source notes. Keep observed facts separate from estimates or interpretation.
03What should I verify next?
Follow the primary-source links and check the limitations before using this evidence for a decision, comparison or citation.
A closer look at 92 km WSW of Adak, Alaska
Depth in another unit
The recorded event depth of 40 km is approximately 24.85 miles below the source reference surface. Depth alone does not describe damage or local hazard.
Interpreting the recorded coordinates
The published position for 92 km WSW of Adak, Alaska is 51.449° north and 177.778° west. This expresses the source coordinates in hemispheres; it does not establish an entrance, public access or a safe route.