Data last collected:
QuakeFactsEvidence report · prepared 24 October 2026https://quakes99.com/entity/usp00037hr
USGS usp00037hr
14 Aug 1987, 18:39
55 km NNW of Nikolski, Alaska
A magnitude 6 mw earthquake at 117.6 km depth.
Published location
Where is 55 km NNW of Nikolski, 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.
53.416000, -169.113000
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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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Catalog fields and provenance
Event ID
usp00037hr
Coordinates
53.416, -169.113
Network
us
Significance
554
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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 55 km NNW of Nikolski, Alaska earthquake: magnitude 6 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 55 km NNW of Nikolski, Alaska
Depth in another unit
The recorded event depth of 117.6 km is approximately 73.07 miles below the source reference surface. Depth alone does not describe damage or local hazard.
Interpreting the recorded coordinates
The published position for 55 km NNW of Nikolski, Alaska is 53.416° north and 169.113° west. This expresses the source coordinates in hemispheres; it does not establish an entrance, public access or a safe route.