David A. Johnston: “Johnston felt scientists must do what is necessary, including taking risks, to help protect the public from natural disasters. His work, and that of fellow USGS scientists, convinced authorities to close Mount St. Helens to the public before the 1980 eruption. They maintained the closure despite heavy pressure to re-open the area; their work saved thousands of lives.”

Wikipedia entry: https://en.wikipedia.org/wiki/David_A._Johnston

Webcam at Johnston Ridge Observatory:

http://www.fs.fed.us/gpnf/volcanocams/msh/

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