Data last collected:
QuakeFactsEvidence report · prepared 23 October 2026https://quakes99.com/entity/usp0001gff
USGS usp0001gff
15 Oct 1981, 02:47
71 km NNE of Miyako, Japan
A magnitude 6 mb earthquake at 47 km depth.
Published location
Where is 71 km NNE of Miyako, Japan?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
40.229000, 142.287000
Open the interactive map ↗Map data © OpenStreetMap contributors
What the numbers mean
Magnitude measures event size; depth locates the source below the surface. Neither value alone establishes local damage or personal risk.
Need a current safety answer?
Use local emergency authorities and the live USGS event page. This historical evidence page is not an alert service.
Continue exploring
Nearby events with a similar magnitude
Catalog fields and provenance
Event ID
usp0001gff
Coordinates
40.229, 142.287
Network
us
Significance
554
Use this record
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 71 km NNE of Miyako, Japan 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 71 km NNE of Miyako, Japan
Depth in another unit
The recorded event depth of 47 km is approximately 29.2 miles below the source reference surface. Depth alone does not describe damage or local hazard.
Interpreting the recorded coordinates
The published position for 71 km NNE of Miyako, Japan is 40.229° north and 142.287° east. This expresses the source coordinates in hemispheres; it does not establish an entrance, public access or a safe route.