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Diaporama
Yellowstone volcan
super-volcano, calderas 2805 m / 9,203 feet
Wyoming, USA, 44.43°N / -110.67°W
Condition actuelle: normal / en sommeil (1 sur 5)
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Eruptions du volcan Yellowstone:
1350 BC ± 200 years
caldera-forming eruptions 70,000 BP, 160,000 BP, and 640,000 years ago (BP)
Style éruptif tipique:
explosive
Derniers séismes proches
Derniers images satellite
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Yellowstone volcano: activity updates

Yellowstone volcano (Wyoming): status remains "green" (normal activity)

samedi juin 04, 2016 09:32 | AUTEUR : T

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.
The USGS Yellowstone Volcano Observatory (YVO) who monitors the caldera's seismic activity, its ground deformation and other geophysical parameters very closely maintains therefore Yellowstone's current status level at "green" = "normal" - actually, the most typical state of any of the world's thousands of active volcanoes.
Yellowstone's current observed activity underground and at the surface (mostly hydrothermal in nature, e.g. its hot mineral springs and geysers) falls well within this normal activity state and should not be sign of worry.

Info abbreviated from the latest monthly USGS/YVO report:
"During May 2016, the Yellowstone Seismic Network recorded 72 earthquakes with the largest being a tiny 2.5 earthquake on 27 May. No earthquake swarms were detected. Overall, seismic activity during May was at low background levels.
Ground deformation:
"Uplift at the Norris GPS station, which began in early 2016, continues at a rate of ~5 cm/yr. The pattern of ground deformation resembles that observed from late 2013 through early 2014, although the present uplift rate is less than half of what it was before. Caldera GPS stations continue to record slow subsidence at a rate of ~1.5 cm/yr.
Current deformation patterns at Yellowstone remain within historical norms."
Actualités précédentes
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]
vendredi, août 02, 2013
The famous Steamboat Geyser erupted again during the past night breaking a 8 years period of dormancy. Known as the currently largest geyser in the world, its jets are known to reach up to 90 m height. ... [details]
vendredi, janv. 04, 2013
During the month of December 2012, the University of Utah reports 101 earthquakes were located in the Yellowstone National Park region with a notable increase of earthquake swarms. ... [details]
Time and depth of quakes at Yellowstone during Oct 2012
vendredi, nov. 02, 2012
Yellowstone earthquake activity remains at background levels. ... [details]
Current seismic signal b207 station (Univ. Utah / USGS)
dimanche, oct. 07, 2012
A small earthquake swarm occurred under the Yellowstone caldera. The quakes are few and very small and no indicator of an impending eruption. It completely falls under what is normal behavior of an active caldera. [details]

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