Data last collected:
QuakeFactsEvidence report · prepared 17 October 2026https://quakes99.com/entity/usp000hw4y
USGS usp000hw4y
11 Mar 2011, 22:54
142 km ESE of Iwaki, Japan
A magnitude 5.4 mb earthquake at 20.4 km depth.
Published location
Where is 142 km ESE of Iwaki, 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.
36.486000, 142.311000
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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
usp000hw4y
Coordinates
36.486, 142.311
Network
us
Significance
449
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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 142 km ESE of Iwaki, Japan earthquake: magnitude 5.4 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.