Imagine standing at the rim of a vast caldera, the earth beneath your feet formed by unimaginable forces millions of years ...

Following a large caldera-forming eruption some magma remains in the magma reservoir.This magma cools, its viscosity increases, and when new magma is injected, the magma left over after the ...

Ana Steffen, a longtime Valles Caldera archeologist who showed the connections of geology, history and Indigenous cultures through her research into obsidian, has died of cancer. Steffen led an ...

Caption The summit caldera of Tambora, which is about 6 kilometers wide and 7 kilometers long and more than 1 kilometer deep, was created by the 1815 eruption. Gray eruptive products form the top ...