QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp000h54n
USGS usp000h54n
17 Dec 2009, 20:41
4 km NE of Ashikaga, Japan
A magnitude 5.1 mwc earthquake at 91.7 km depth.
Published location
Where is 4 km NE of Ashikaga, 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.
36.370000, 139.481000
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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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Catalog fields and provenance
Event ID
usp000h54n
Coordinates
36.37, 139.481
Network
us
Significance
490