Data last collected:
QuakeFactsEvidence report · prepared 24 October 2026https://quakes99.com/entity/usc000faj4
USGS usc000faj4
20 Feb 2013, 08:47
198 km SSE of Atka, Alaska
A magnitude 5.4 mwc earthquake at 25.3 km depth.
Published location
Where is 198 km SSE 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.
50.457000, -173.576000
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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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Use local emergency authorities and the live USGS event page. This historical evidence page is not an alert service.
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Nearby events with a similar magnitude
Catalog fields and provenance
Event ID
usc000faj4
Coordinates
50.457, -173.576
Network
us
Significance
449
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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 198 km SSE of Atka, Alaska earthquake: magnitude 5.4 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 198 km SSE of Atka, Alaska
Depth in another unit
The recorded event depth of 25.3 km is approximately 15.72 miles below the source reference surface. Depth alone does not describe damage or local hazard.
Interpreting the recorded coordinates
The published position for 198 km SSE of Atka, Alaska is 50.457° north and 173.576° west. This expresses the source coordinates in hemispheres; it does not establish an entrance, public access or a safe route.