File:Dave Johnston with gas-detection instrument at Mount St. Helens, 4 April 1980 (USGS) 2 (cropped).jpg
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Summary
| Description | The late Dr. David Johnston, U.S. Geological Survey, using a correlation spectrometer which measures ultra-violet radiation as an indicator of the sulfur dioxide content of gases ejected from Mount St. Helens. Skamania County, Washington. 1980. Published on p. B100 in U.S. Geological Survey. Professional paper 1240-B. 1981. | |||
| Date | ||||
| Source | ID. Mount St. Helens - 32 (USGS) - alternative ID number: msh00032 | |||
| Author | Unknown (taken by or for USGS) | |||
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Licensing
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This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 04:34, 5 June 2018 | | 786 × 973 (437 KB) | TDKR Chicago 101 | File:Dave Johnston with gas-detection instrument at Mount St. Helens, 4 April 1980 (USGS) 2.jpg cropped 71 % horizontally, 76 % vertically using CropTool with precise mode. |
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