Mount St. Helens, Skamania County, Washington, United States
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins88% CONFIDENCEOverall confidence: 88%How well the pin's source and references back up its dates.Weighted average of how firmly 3 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
The moment is recorded to the second: "An earthquake at 8:32:11 am PDT (UTC-7) on May 18, 1980, caused the entire weakened north face to slide away", which is 15:32:11 UTC.[1]An earthquake at 8:32 a.m. local time dropped the volcano's weakened north face away in the largest subaerial landslide on record, uncorking a lateral blast toward Spirit Lake. Fifty-seven people were killed.
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