Digital elevation model of Yellowstone National Park and vicinity
Digital elevation model of Yellowstone National Park and vicinity, showing the location of the calderas formed during each of Yellowstone’s three most recent volcanic cycles. The youngest caldera-forming eruption produced Yellowstone Caldera (green line), located within Yellowstone National Park. Henrys Fork Caldera (blue line), was formed as a result of Yellowstone’s second caldera-forming eruption, approximately 1.3 million years ago, and has since been filled in with basaltic lava flows that cause the flat, low-relief topography in that region. Figure modified from Christiansen et al. (2007).