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Aerial view of Mount St. Helens bulge expansion. Skamania County, Washington. 1980.


Date Taken


Caption: Mount St. Helens bluge has expanded 80 feet. April 7, 1980 aerial view from the north of Mount St. Helens showing Mt. Hood (left) and Mt. Jefferson (right) in the foreground. The "bulge" area can be seen in the center of the photo and appears to have a noticeably cracked surface. USGS scientists announced on April 30, 1980 about 2 weeks before the large eruption on May 18, 1980 that this area had risen at least 80 feet, most of it apparently since the initial phases of the eruption began in late March. They indicated that the rise was suspected to be caused by several factors including the upward movement of magna. When the major eruption occurred in mid-May, the bulge area and an additional 5, 000 feet of the north slope [...]


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U.S. Geological Survey

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PIO_80_138b.jpg thumbnail 3.13 MB image/jpeg
PIO_80_138b.tif 46.81 MB image/geotiff

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Available in the U.S. Geological Survey Denver Library Photographic Collection, 2010 DENPH0011, PIO Collection.


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Photo Number PIO_80_138b

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