CALDERA VOLCANOS

MAKENZIE LAND, BRITTANY PATRICK, AINSLEY STEWART, JONATHAN FLOYD

GENERAL CHARACTERISTICS • -Calderas are formed when a volcano collapses into its magma chamber during an explosive eruption. Eruption

empties magma chamber and takes away support for mountain top.

• -Collapse enlargers crater of volcano and fills it with collapsed materials, which later burry deep beneath the crater.

• -They may be located over large magma chambers in middle of a land mass.

• -They usually form in association with extremely explosive and powerful eruptions.

FORMATION

• A caldera is a volcanic feature formed by the collapse of a volcano into itself, making it a large, special form of volcanic crater. A caldera collapse is usually triggered by the emptying of the magma chamber beneath the volcano, as the result of a large volcanic eruption.

TYPE OF MAGMA

Rhyolitic

A usually light-colored, fine-grained extrusive igneous rock that is compositionally similar to granite. It often includes flow lines formed during the extrusion.

WHERE THEY ARE FOUND

• Convergent boundaries

LOCATIONS

• Africa, East Asia, Southeast Asia, Southwest Asia, Russia, USA, South America, Europe, New Zealand, and Australia

• Alaska, Oregon, Colorado, California, Idaho, New Mexico, Wyoming, and Canada

Caldera volcano in Alaska