Data last collected:
QuakeFactsEvidence report · prepared 19 October 2026https://quakes99.com/entity/iscgem845214
USGS iscgem845214
4 Jul 1966, 19:33
246 km W of Adak, Alaska
A magnitude 6.8 mw earthquake at 17.6 km depth.
Published location
Where is 246 km W 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.
51.789000, 179.798000
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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
iscgem845214
Coordinates
51.789, 179.798
Network
iscgem
Significance
711
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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 246 km W of Adak, Alaska earthquake: magnitude 6.8 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 246 km W of Adak, Alaska
Depth in another unit
The recorded event depth of 17.6 km is approximately 10.94 miles below the source reference surface. Depth alone does not describe damage or local hazard.
Interpreting the recorded coordinates
The published position for 246 km W of Adak, Alaska is 51.789° north and 179.798° east. This expresses the source coordinates in hemispheres; it does not establish an entrance, public access or a safe route.