The Yellowstone Plateau region has crustal thickness of 47–52 km; this thick crust primarily manifests the Laramide age shortening associated with the Beartooth Mountains and the magmatic underplate that created the high-velocity lower crust beneath much of the Wyoming Province crust.
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Yellowstone is a hotspot—an area of anomalously high temperatures and some melting within Earth's upper mantle (the layer between the crust and the core that makes up the bulk of Earth's volume). The intense heat generated by the hotspot causes melting of the crust, forming basaltic and rhyolitic magma.
So can you even swim in Yellowstone? The short answer is yes. The long answer is: it's pretty limited. Although there are many rivers, lakes, and springs in the park, it's very important to note that the vast majority of the waters are incredibly dangerous.
The Yellowstone supervolcano last erupted about 640,000 years ago. A sleeping giant is nestled in the western part of the United States. Though it stirs occasionally, it has not risen from slumber in nearly 70,000 years.
The Yellowstone Caldera in north-western Wyoming is one of the largest volcanoes in the world. In the past 2.1 million years, it has seen three catastrophic eruptions that blanketed North America in ash and a number of smaller eruptions where lava flowed within the caldera, most recently 70,000 years ago.
A new 3-D model shows the 45-mile-wide (72-kilometer-wide), 410-mile-deep (660-kilometer-deep) plume of hot, molten rock rising under Yellowstone's supervolcano.
The Yellowstone area was almost the last unexplored region within the coterminous United States when Hayden led his expedition into the Yellowstone area in 1871. Westward migration had passed it by, and even the discovery of gold in nearby Montana failed to stimulate the exploration of Yellowstone.
Geologists believe the ash from the eruption would encircle the globe in as little as 48 hours, and make temperatures drop by a minimum of two degrees celsius for as long as 20 years. The cooling of the Earth could be catastrophic for the planet's fragile ecosystem, kicking off a chain reaction of extinctions.
Seismic data reveals a rising column of molten rock beneath Yellowstone that originates at least 400 miles below Earth's surface. This mantle plume explains why Yellowstone is located in the middle of a tectonic plate.
Those parts of the surrounding states of Montana, Idaho, and Wyoming that are closest to Yellowstone would be affected by pyroclastic flows, while other places in the United States would be impacted by falling ash (the amount of ash would decrease with distance from the eruption site).
Yellowstone Supervolcano (Wyoming, United States) Effects of a major eruption: When the Yellowstone Caldera, or supervolcano, in Yellowstone National Park erupts again, its effects would be worldwide, the U.S. Geographical Survey said.
Yellowstone's greatest geological threat isn't a supervolcano. It's a magnitude-7 earthquake. YELLOWSTONE NATIONAL PARK, Wyo. – While concerns about a potential eruption of the supervolcano beneath this iconic park may garner the most alarming headlines, a more likely hazard in the coming decades is a large earthquake.
Yellowstone Lake is the largest body of water in Yellowstone National Park. The lake is 7,732 feet above sea level and covers 136 square miles with 110 miles of shoreline.