QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/iscgem785990
USGS iscgem785990
28 Apr 1971, 16:32
22 km NE of Simao, China
A magnitude 6 mw earthquake at 10 km depth.
Published location
Where is 22 km NE of Simao, China?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
22.935000, 101.121000
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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
iscgem785990
Coordinates
22.935, 101.121
Network
iscgem
Significance
561