Mount Hood
Mount Hood is located at 45.374 N and
121.694 W and stands approximately 3,426 Meters or 11,245 feet high. Mount
Hood is described as a Stratovolcano
volcano, or a composite volcano. This volcano is located only 75
kilometers east-southeast of Portland, Oregon. U.S. Highway 26 crosses the
southern most part of Mount Hood, and Oregon Highway 35 meets it along the east
side.
Links to find Other Volcano sites:
http://www.geophys.washington.edu
http://vulcan.wr.usgs.gov/Glossary/framework.html
MOUNT
ST HELENS
On May 18 1980 at approximately 8:32 a.m. Pacific Daylight Time there was an earthquake with a magnitude of 5.1 that shook Mount St. Helens. As a result of this earthquake the bulge and surrounding area slid away in a gigantic rockslide, debris avalanche. Because of this it released pressure and triggered a major eruption of the volcano causing a down fall of pumice and ash . Because of this 1300 feet or 400 meters of the peak collapsed or blew off. As a result of this erruption 24 square miles or 62 square kilometers of valley was filled with a debris avalanche. 250 square miles or 650 square kilometers of recreation, timber, and private lands were damaged by a lateral blast. An estimated 200 million cubic yards or 150 million cubic meters of material was deposited directly by volcanic mudflows into the river channels. Fifty-seven people were killed or are still missing.
For Photo Archives:
http://vulcan.wr.usgs.gov/Photo/SlideSet/ljt_slideset.html
SEISMOLOGY:
http://vulcan.wr.usgs.gov/Glossary/framework.html
This is the seismogram from the Garden
Seismic Station. In this picture it is showing an increase in the
earthquakes intensity during an eruption (dome-building) of Mount St. Helens.