The progressive chain of volcanic centers indicate about the possible origin of the active volcanism at yellowstone. The volcano was created by a hotspot because all subsequent plate movement, from older to younger, originates there.
The southernmost Cascade Range has huge, long-lived volcanic centres that produce eruptions of all known forms of magma (from low- silica basalt to high-silica rhyolite). They develop when sizable masses of basalt magma, which closely resembles the mantle in composition, rise through and gather in the crust.
Over the last several million years, the supervolcano under Yellowstone has erupted three times with great force. Each eruption produced an ash blanket several feet thick that covered a large portion of what is now the western United States. Although the most recent eruption occurred 640,000 years ago, the next one is not necessarily overdue.
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