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The World's First National Park. On March 1, 1872, Yellowstone became the first national park for all to enjoy the unique hydrothermal and geologic features. Within Yellowstone's 2.2 million acres, visitors have unparalleled opportunities to observe wildlife in an intact ecosystem, explore geothermal areas that contain about half the world’s ...
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- Geology
Yellowstone National Park, the oldest, one of the largest, and probably the best-known national park in the United States. It is situated principally in northwestern Wyoming and partly in southern Montana and eastern Idaho and includes the greatest concentration of hydrothermal features in the world. The park was established by the U.S. Congress on...
Yellowstone is situated in a region that has been volcanically and seismically active for tens of millions of years. Tectonic movement of the North American Plate has thinned Earth’s crust in the area, forming a hot spot (a place where a dome of magma, or molten rock, comes close to the surface). About 2.1 million years ago a subsurface magma dome that had been building up in the Yellowstone area blew up in one of the world’s most cataclysmic volcanic eruptions. Some 600 cubic miles (2,500 cubic km) of rock and ash were ejected, equivalent to about 6,000 times the amount of volcanic material that was released during the eruption of Mount Saint Helens in 1980. (Observations made in the early 21st century indicated that this single eruption actually consisted of two events about 6,000 years apart: one very large and a second much smaller one. Subsequent massive eruptions occurred about 1,300,000 and 640,000 years ago—the last event (consisting in large part of lava flows) producing about two-fifths as much material as the first one.
Each of those eruptions caused the magma dome that had built up to collapse as its contents were released, leaving an enormous caldera. The present-day Yellowstone Caldera, the product of the third eruption, is a roughly oval-shaped basin some 30 by 45 miles (50 by 70 km) that occupies the west-central portion of the national park and includes the northern two-thirds of Yellowstone Lake. Two resurgent magma domes—one just north of and the other just west of Yellowstone Lake—have been forming in the caldera, and the western dome underlie many of the park’s best-known hydrothermal features.
The Yellowstone region is also extremely active seismically. A network of faults associated with the region’s volcanic history underlies the park’s surface, and the region experiences hundreds of small earthquakes each year. The great majority of those quakes are of magnitude 2.0 or less and are not felt by people in the area, but occasionally a more powerful temblor will strike in the region and have effects in the park. One such event, a deadly quake that struck in 1959 in southern Montana just outside the northwestern corner of the park, affected a number of hydrothermal features in Yellowstone, including its iconic geyser, Old Faithful.
Britannica Quiz
El parque nacional de Yellowstone es la atracción principal de los 20 000 000 acres (80 937,2 km²) que ocupa el ecosistema del Gran Yellowstone, una región en la que también se encuentra el parque nacional de Grand Teton, algunos bosques nacionales, donde habita una amplia vida salvaje.
Resumen del parque. El Parque Nacional Yellowstone se estableció en 1872 y es el primer parque nacional de Estados Unidos. Ubicado en Wyoming, Montana e Idaho, alberga una gran variedad de animales salvajes como osos pardos, lobos, bisontes y alces.
Yellowstone National Park is a national park located in the western United States, largely in the northwest corner of Wyoming and extending into Montana and Idaho. It was established by the 42nd U.S. Congress with the Yellowstone National Park Protection Act and signed into law by President Ulysses S. Grant on March 1, 1872.
12 de abr. de 2019 · Everything to know about Yellowstone National Park. Here’s what to see and do in the world’s first national park. By Joe Yogerst. April 12, 2019. • 20 min read. Fast Facts. Location:...
