Oshima as an island stratovolcano with a large caldera on its summit. Stratovolcanoes are conical volcanoes built up by many layers of hardened lava and volcanic ash, with steep profiles and periodic eruptions.Know More
The main stratovolcano cone of the island has a base composed of basalt lava and pyroclastic rocks. When an erupting volcano empties a shallow magma chamber, the volcanic formation can collapse into the voided reservoir and produce a cauldron-like depression.
Based on geological evidence, it is estimated that Oshima has erupted over 100 times since 8450 B.C. As of 2014, the last eruption was in 1990 at the summit of Mihara-yama.Learn more about Volcanoes
Technically, Surtsey is an island and not a volcano. However, its formation was due to the continuous eruption of an underwater volcano known as a submarine volcano, or seamount.Full Answer >
Krakatoa, or Krakatau, is a caldera volcano. Calderas are depressions formed when a volcano collapses into itself. The result is a large crater surrounded by steep cliffs and possibly filled with lakes.Full Answer >
Mount Pinatubo is an active stratovolcano, or a cone-shaped volcano, that is made from many layers of hardened ash, lava and other volcanic rock. Stratovolcanoes are also called composite volcanoes.Full Answer >
Mount Kilauea on the Big Island of Hawaii is a shield volcano. Its continuous lava flow since 1983 is a defining characteristic of a shield volcano.Full Answer >