Image:St Helens April 27, 1980 showing bulge.jpg
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St_Helens_April_27,_1980_showing_bulge.jpg (41 ko, type 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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This work is in the public domain in the United States because it is a work of the United States Federal Government under the terms of Title 17, Chapter 1, Section 105 of the US Code. See Copyright.
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