Gas Sampling around the Mount St. Helens Dome
![Image shows two scientists on the slopes of Mount St. Helens with steam rising around them](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/img950.jpg?itok=vwTMIkxd)
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.
Sources/Usage
Public Domain.