Imagen:St Helens April 27, 1980 showing bulge.jpg
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St_Helens_April_27,_1980_showing_bulge.jpg (543 × 353 píxeles; tamaño de archivo: 40 KB; tipo MIME: image/jpeg)
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[edit] Description
A "bulge" developed on the north side of Mount St. Helens as magma pushed up within the peak. Angle and slope-distance measurements to the bulge indicated it was growing at a rate of up to five feet (1.5 meters) per day. By May 17, part of the volcano's north side had been pushed upwards and outwards over 450 feet (135 meters). The view is from the northeast. (April 27, 1980, by Peter W. Lipman, USGS) USGS image
[edit] Summary
| Description |
North Fork Toutle River valley in November 1983 |
|---|---|
| Source |
http://vulcan.wr.usgs.gov/Volcanoes/MSH/SlideSet/ljt_slideset_old.html |
| Date | |
| Author |
U.S. government |
| Permission |
PD |
| Other versions | none |
[edit] Licensing
 |
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