QuakeFactsEvidence report · prepared 2 September 2026https://quakes99.com/entity/usp0004php
USGS usp0004php
26 Mar 1991, 03:58
113 km ESE of Hengchun, Taiwan
A magnitude 6.3 mw earthquake at 17.7 km depth.
Published location
Where is 113 km ESE of Hengchun, Taiwan?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
21.704000, 121.789000
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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
usp0004php
Coordinates
21.704, 121.789
Network
us
Significance
611