QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgemsup602790117
USGS iscgemsup602790117
22 Mar 1909, 20:03
227 km ESE of Ishinomaki, Japan
A magnitude 6.6 mw earthquake at 15 km depth.
Published location
Where is 227 km ESE of Ishinomaki, 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.
37.533000, 143.638000
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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
iscgemsup602790117
Coordinates
37.533, 143.638
Network
iscgemsup
Significance
668