Data last collected:
QuakeFactsEvidence report · prepared 23 October 2026https://quakes99.com/entity/iscgemsup913945
USGS iscgemsup913945
8 Oct 1915, 15:36
139 km S of Ōyama, Japan
A magnitude 7 mB earthquake at 290 km depth.
Published location
Where is 139 km S of Ōyama, 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.
33.353000, 138.045000
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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
iscgemsup913945
Coordinates
33.353, 138.045
Network
iscgemsup
Significance
754
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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 139 km S of Ōyama, Japan earthquake: magnitude 7 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 139 km S of Ōyama, Japan
Depth in another unit
The recorded event depth of 290 km is approximately 180.2 miles below the source reference surface. Depth alone does not describe damage or local hazard.
Interpreting the recorded coordinates
The published position for 139 km S of Ōyama, Japan is 33.353° north and 138.045° east. This expresses the source coordinates in hemispheres; it does not establish an entrance, public access or a safe route.