Yellowstone is underlain by two magma bodies. The shallower one is composed of rhyolite (a high-silica rock type) and stretches from 5 km to about 17 km (3 to 10 mi) beneath the surface and is about 90 …

Mar 3, 2026 · The Yellowstone magma chamber is among the largest known volcanic reservoirs on Earth. Its upper chamber, located three to eight miles beneath the surface, contains primarily rhyolitic …

The Yellowstone Volcano Observatory monitors volcanic activity and does not consider an eruption imminent. Imaging of the magma reservoir indicates a substantial volume of partial melt beneath …

Blasts from the Past The first major eruption of the Yellowstone volcano, which occurred 2.1 million years ago, is among the largest volcanic eruptions known, covering over 5,790 square miles with …

Apr 16, 2025 · A high-silica type of igneous rock called rhyolite makes up Yellowstone’s magma chamber, which spans an area 55 miles by 30 miles, dropping to a depth of 10 miles below the surface.

Jan 7, 2025 · Why the new study on the Yellowstone magma chamber is important Knowing the chemical composition of the magma that accumulates at depth is important because the type of …

Yellowstone Caldera, enormous crater in the western-central portion of Yellowstone National Park, northwestern Wyoming, that was formed by a cataclysmic volcanic eruption some 640,000 years …

Apr 18, 2025 · As the underground magma chamber emptied, the ground above it collapsed and created the first of Yellowstone’s three calderas. This eruption 2.1 million years ago—among the largest …

Aug 2, 2020 · Beneath Yellowstone National Park lies a magma chamber, a magma reservoir and a magma plume. 3 to 10 miles below the surface, the dimensions of the upper chamber is 55 miles …

Magma Chamber: Beneath the Yellowstone Caldera lies a massive reservoir of molten rock known as a magma chamber. This chamber is estimated to be around 30 to 50 kilometers (18 to 31 miles) below …