Gas Sampling around the Mount St. Helens Dome
(Credit: Thomas Casadevall, USGS. Public domain.)
Detailed Description
USGS geologists gathered samples by hand from vents on the dome and crater floor. Additionally, sulfur dioxide gas was measured from a specially equipped airplane before, during, and after eruptions to determine "emission rates" for the volcano.
Details
Image Dimensions: 3072 x 2048
Date Taken:
Location Taken: US