gov.noaa.ngdc.mgg.photos:42An earthquake occurred at 15 32 UT, only seconds before the explosion that began the eruption of Mount St. Helens volcano. This eruption and blast blew off the top of the volcano, reducing its elevation by 396 meters, killed 31 people and caused an estimated property damage of between $0.5 billion and $2 billion. About 53 earthquakes having magnitude larger than 4.5 were located near Mount St. Helens before the main event and eruption. No earthquakes having magnitudes higher than 4.5 were located following the eruption.To provide long-term scientific data stewardship for the Nation's geophysical data, ensuring quality, integrity, and accessibilityIn workasNeeded-122.194-122.19446.21446.214NASA/GCMD Earth Science KeywordsEARTH SCIENCE > HUMAN DIMENSIONS > Natural Hazards > Geological HazardsRestriction Code: otherRestrictions; DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of CommerceHazards Dataphysical and mailing NOAA/NESDIS/NGDC E/GC 325 Broadway BoulderCO80305-3328(303) 497-3707haz.info@noaa.govUnknown 20120222Heather McCulloughDOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commercemailing and physical NOAA/NESDIS/NGDC/MGG 325 Broadway E/GC3 BoulderCO80305-3328(303) 497-3707haz.info@noaa.govHeather.McCullough@noaa.govContent Standard for Digital Geospatial Metadata: Extensions for Remote Sensing MetadataFGDC-STD-012-2002