Volcanic Activity

TOPIC		LINKS
How are Volcanoes Related to Plate Tectonics?		Follow the instructions of the homepage and answer the questions at the bottom of each page.


Distribution of Active Volcanoes and Earthquakes		Recent Earthquakes
		Find volcanic eruptions by date
		SI/USGS Weekly Volcanic Activity Report
		Global Volcanism Program Google Earth File
		USGS Google Earth Files

Specific Volcanic Sites		USGS Hawaiian Volcanoes Observatory
		USGS Cascades Volcanoes Observatory





Mount Saint Helens as viewed from the west side on March 25, 1980, just two days before the first visible volcanic activity. Mount Saint Helens is the youngest of the major Cascade volcanoes. [Photograph Credit: Dept. of Natural Resources, State of Wash.]		Mount Saint Helens viewed from the north on June 4, 1980. The huge U-shaped basin formed by the landslide and the initial blast from the May 18, 1980 eruption. The mountain was lowered 1,300 feet. [Photo Credit: Dept. of Natural Resources, State of Wash.]