Introduction to Volcanism (Alt + 1)
Eruptions and Hazards (Alt + 2)
Volcanic Landforms and Features (Alt + 3)
Monitoring Volcanic Activity (Alt + 4)
National Parks with Volcanoes (Alt + 5)
Effusive eruptions and their hazards Explosive eruptions and their hazards Volcanic hazards
Help and Information Center (Alt + H)
Volcanism Main Index (Alt + I)
Views Visitor Center (Alt + V)
Glossary (Alt + G)
Text-only version (Alt + T)
Teacher Resource Center for Volcanism (Alt + R)
Eruptions and Hazards
When the pressure inside a volcano grows to a point where the overlying surface can no longer contain is, an eruption occurs. Erupts are as unique as each volcano, from gentle lava flows and fountains to destructive pyroclastic eruptions.

There are many hazards and dangers associated with volcanic activity. These hazards can be local, or even global in scale.

Learn more about two main forms of eruptions, and some of the hazards associated with each.