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18-Apr-2020 22:16 by 4 Comments

Hayden christiansen dating

The major features of the caldera measure about 34 by 45 miles (55 by 72 km).The caldera formed during the last of three supereruptions over the past 2.1 million years: the Huckleberry Ridge eruption 2.1 million years ago (which created the Island Park Caldera and the Huckleberry Ridge Tuff); the Mesa Falls eruption 1.3 million years ago (which created the Henry's Fork Caldera and the Mesa Falls Tuff); and the Lava Creek eruption approximately 630,000 years ago (which created the Yellowstone Caldera and the Lava Creek Tuff).

Some geoscientists hypothesize that the Yellowstone hotspot is the effect of an interaction between local conditions in the lithosphere and upper mantle convection.

Occasionally, numerous earthquakes are detected in a relatively short period of time, an event known as an earthquake swarm.

In 1985, more than 3,000 earthquakes were measured over a period of several months.

Smaller steam explosions occur as well: an explosion 13,800 years ago left a 5 km (3.1 mi) diameter crater at Mary Bay on the edge of Yellowstone Lake (located in the center of the caldera).

Currently, volcanic activity is exhibited via numerous geothermal vents scattered throughout the region, including the famous Old Faithful Geyser, plus recorded ground-swelling indicating ongoing inflation of the underlying magma chamber.

Volcanism at Yellowstone is relatively recent, with calderas that were created during large eruptions that took place 2.1 million, 1.3 million, and 630,000 years ago.

The calderas lie over a hotspot where light, hot, molten rock from the mantle rises toward the surface.

If the pressure is released to a sufficient degree by some geological shift, then some of the gases bubble out and cause the magma to expand. If the expansion results in further relief of pressure, for example, by blowing crust material off the top of the chamber, the result is a very large gas explosion.

According to analysis of earthquake data in 2013, the magma chamber is 80 km (50 mi) long and 20 km (12 mi) wide.

More than 70 smaller swarms were detected between 19.

The USGS states these swarms are likely caused by slips on pre-existing faults rather than by movements of magma or hydrothermal fluids.

The loosely defined term "supervolcano" has been used to describe volcanic fields that produce exceptionally large volcanic eruptions.

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