Saturday, 17 September 2011

Most dangerous Volcano is tourist spot?

Established in 1872, Yellowstone National Park is America's first national park. Located in Wyoming, Montana and Idaho, it is home to a large variety of wildlife including grizzly bears, wolves, bison, and elk. 

Preserved within Yellowstone National Park are Old Faithful and a collection of the world's most extraordinary geysers and hot springs, and the Grand Canyon of the Yellowstone.

Volcanic History Overview: The Yellowstone Plateau volcanic field developed through three volcanic cycles spanning two million years that included some of the world's largest known eruptions. 

Eruption of the >2450 cu km Huckleberry Ridge Tuff about 2.1 million years ago created the more than 75-km-long Island Park caldera. The second cycle concluded with the eruption of the Mesa Falls Tuff around 1.3 million years ago, forming the 16-km-wide Henrys Fork caldera at the western end of the first caldera. 

Activity subsequently shifted to the present Yellowstone Plateau and culminated 640,000 years ago with the eruption of the >1000 cu km Lava Creek Tuff and the formation of the present 45 x 85 km caldera. 

Resurgent doming subsequently occurred at both the NE and SW sides of the caldera and voluminous (1000 cu km) intracaldera rhyolitic lava flows were erupted between 150,000 and 70,000 years ago. 

No magmatic eruptions have occurred since the late Pleistocene, but large phreatic eruptions took place near Yellowstone Lake during the Holocene. 

Yellowstone is presently the site of one of the world's largest hydrothermal systems including Earth's largest concentration of geysers. 

  • An Active Volcano
  • Approximately 2,000 earthquakes annually
  • Approximately 10,000 thermal features
  • More than 300 geysers
  • One of the world’s largest calderas, measuring 45 by 30 miles (72 by 48 km)
  • One of the world's largest petrified forests
  • Approximately 290 waterfalls, 15 ft. or higher, flowing year-round
  • Tallest waterfall: Lower Falls of the Yellowstone River at 308 ft. (94 m)
  • 9 visitor centers and museums
  • 9 hotels/lodges (2,238 hotel rooms/cabins)
  • 7 NPS-operated campgrounds (454 sites)
  • 5 concession-operated campgrounds (1,747 sites)
  • 2,000+ buildings (NPS and concessions)
  • 49 picnic areas
  • 1 marina

Thanks: volcanoes.usgs,, and Google Pics.

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