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Diaporama
samedi, juin 04, 2016
The activity at the caldera (seismicity, deformation, degassing etc) remains at normal levels. Despite continuing rumors and fear-mongering media (unsupported by facts), there is currently no sign to believe that the so-called "supervolcano" is about to erupt violently anytime soon. ... [details]
The recent earthquakes at Yellowstone
lundi, mars 31, 2014
A magnitude 4.8 earthquake at shallow 7 km depth occurred yesterday morning with an epicenter located 4 miles north-northeast of Norris Geyser Basin in Yellowstone National Park. It was the largest quake since 1980 and occurred near the center of a region of recent ground uplift. ... [details]
 

Yellowstone volcan éruptions

super-volcano, calderas 2805 m / 9,203 feet
Wyoming, USA, 44.43°N / -110.67°W
Liste des éruptions: 1350 BC ± 200 years
caldera-forming eruptions 70,000 BP, 160,000 BP, and 640,000 years ago (BP)


2010 seismic unrest
In January-February 2010 the second largest recorded earthquake swarm was recorded at Yellowstone, with over 1800 tremors, the largest being magnitude 3.8 and felt in the park and surroundings. USGS scientists believe that most of the earthquakes were tectonic in origin caused by regional extension, while others were caused by geothermal activity.

2008 unrest
Between 26 and 31 December 2008, an earthquake swarm with over 250 events occurred under Yellowstone Lake, three to six miles south-southeast of Fishing Bridge. The largest earthquake was a magnitude 3.9 at 10:15 pm MST on 27 December. 9 earthquakes measured between M3 and M3.9 and 24 between M2 to M2.9. Some of the quakes were felt in Yellowstone National park.

2003 unrest
Changes in Norris Geyser Basin were observed in 2003 and hiking trails were closed as safetyl measures. New fumaroles were observed and some geysers had elevated temperatures.

Prominent features at Yellowstone
Yellowstone National Park is well known for its geysers, colorful springs and scenic landscapes:
Old Faithful Area
Features include Upper Geyser Basin, Lower Geyser Basin, Midway Geyser Basin, Lone Star Geyser Basin, Shoshone Geyser Basin, Craig Pass/Isa Lake, and many waterfalls.
Norris Geyser Basin
This area has the hottest geothermal vents at Yellowstone. Features include Roaring Mountain, Gibbon River, Virginia Cascades, and Norris-Canyon Blowdown.
Mammoth Hot Springs
Travertine terraces created by hot springs flowing up through limestone. Hydrocarbon ions combine with calcium to precipitate as travertine. Features of the area include Gardner River Canyon, Boiling River, Mt. Everts, and Bunsen Peak.
Madison Area
Interesting features include the colorful lake Artist Paint Pots, Gibbon Falls, Monument Geyser Basin, Madison River, Terrace Springs, Firehole River, Firehole Canyon Drive and Firehole Falls.
Other Interesting Park Features
Yellowstone Lake, Abyss Pool, Fishing Cone, Isa Lake, Heart Lake, DeLacy Creek, Factory Hill, Lewis River, Red Mountains, Riddle Lake, Shoshone Lake, Snake River, Mud Volcano/Sulphur Caldron, Hayden and Pelican Valleys, Natural Bridge, Grand Canyon of the Yellowstone, Mt. Washburn, Tower Fall, and Calcite Springs.
 

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