On May 8, 1980, Mount St. Helens erupted. This was after a 5.1 earthquake and it was a big event.
There had been small earthquakes before that and the United States Geology Service warned that the Mount St. Helens volcano could erupt.
The United States Geology Service, USGS, and the Forest Service of the United States Department of Agriculture, fs, usda took pictures before and after the eruption.
Let’s start with the maps.
Cascades mountain range by, Shannon, Wikipedia Commons
This shows layers of a volcano by, USGS.
This is a before picture by, fs, usda.
This is the plume by, Mike Doukas, USGS.
This picture was take before the eruption by, US Forest Service.
This is the same place after the eruption by, fs, usda.