Data last collected:
QuakeFactsEvidence report · prepared 19 October 2026https://quakes99.com/entity/usb000jgju
USGS usb000jgju
4 Sept 2013, 03:32
81 km SSW of Atka, Alaska
A magnitude 6.5 mww earthquake at 20 km depth.
Published location
Where is 81 km SSW of Atka, 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.
51.557300, -174.767100
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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
usb000jgju
Coordinates
51.5573, -174.7671
Network
us
Significance
650
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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 81 km SSW of Atka, Alaska earthquake: magnitude 6.5 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 81 km SSW of Atka, Alaska
Depth in another unit
The recorded event depth of 20 km is approximately 12.43 miles below the source reference surface. Depth alone does not describe damage or local hazard.
Interpreting the recorded coordinates
The published position for 81 km SSW of Atka, Alaska is 51.5573° north and 174.7671° west. This expresses the source coordinates in hemispheres; it does not establish an entrance, public access or a safe route.