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Saturday, November 10, 2012

Long Valley Caldera about to Blow?

Low-level seismicity continues with M1Long LongValley Caldera (CA) today.  (station MXX1)

Volcano activity of November 9, 2012 – Long Valley Caldera, Popocatepetl, San Miguel, Nevado del Ruiz, Tongariro and White Island

Volcanologists were horrified by news that the U.S. Geological Survey showed renewed volcanic activity in the Long Valley region in California.
The fear was that this could be the forerunner to another caldera-forming eruption in the area, which is when a new valley is created by a gigantic explosion. The one that initially formed the Long Valley caldera buried thousands of square miles of California under volcanic ash, some 760,000 years ago.

Long Valley Caldera is a depression in eastern California that is adjacent to Mammoth Mountain. The valley is one of the earth's largest calderas, measuring about 20 mi (32 km) long (east-west) and 11 mi (18 km) wide (north-south). The elevation of the floor of the caldera is 6,500 ft (2,000 m) in the east and 8,500 ft (2,600 m) in the west. The elevation of the caldera walls reach 9,800–11,500 ft (3,000–3,500 m), except in the east, where the wall rises only 500 ft (150 m) to an elevation of 7,550 ft (2,300 m).
Long Valley was formed 760,000 years ago when a hugevolcanic eruption released very hot ash that later cooled to form the Bishop tuff that is common to the area. The eruption was so colossal that the magma chamber under the now destroyed volcano was emptied to the point of collapse. The collapse itself caused an even larger secondary eruption of pyroclastic ash that burned and buried thousands of square miles. Ash from this eruption blanketed much of the western part of what is now theUnited States.

Quick Facts

The 16 x 32 km (20 x 10 mi) Long Valley caldera east of the central Sierra Nevada Range formed as a result of the voluminous Bishop Tuff eruption (considered a "super eruption) about 760,000 years ago. Resurgent doming in the central part of the caldera occurred shortly afterwards, and the last eruptions inside the caldera occurred about 50,000 years ago. During early resurgent doming the caldera was filled with a large lake that left lake-shore traces (strandlines) on the caldera walls and the resurgent dome island; the lake eventually drained through the Owens River Gorge. The caldera remains thermally active, with many hot springs and fumaroles, and has had significant deformationseismicity, and other unrest in recent years. A robust geothermal system inside the caldera fuels the Casa Diablo power plant, which generates enough power for 40,000 homes.

The late-Pleistocene to Holocene Mono-Inyo Craters, which cut the northwest topographic rim of thecaldera, along with Mammoth Mountain, on the southwest topographic rim, are west of the structural caldera and are chemically and tectonically distinct from the Long Valley magmatic system. The most recent activity in the area was about 300 years ago in Mono Lake. Both Long Valley Caldera and Mammoth Mountain have experienced episodes of heightened unrest over the last few decades (earthquakes, ground uplift, and/or volcanic gas emissions). As a result, the USGS manages a dense array of field sensors providing the real-time data needed to track unrest and assess hazards.

Location: California, Mono County
Latitude: 37.7° N
Longitude: 118.87° W
Elevation: 2,600 (m) 8,530 (f)
Volcano type: caldera
Composition: basalt to rhyolite
Most recent eruption: 50,000 years ago
Nearby towns: Mammoth Lakes

Aeromagnetic Survey of Long Valley and Mono Basin Volcanic Areas 
October 12, 2012
In mid-October, U.S. Geological Survey volcanologists and geophysicists plan to conduct the first comprehensive, high-resolution airborne magnetic survey of the rock layers under Mono Basin and Long Valley, on the east side of the California Sierra Nevada mountains. The resulting 3D subsurface geologic map will improve assessment of both volcanic and earthquake hazards in the mapped region. For more information about the airborne survey and how the resulting data will be used, read the full press release

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  1. Anonymous8:44 AM

    36o 24' 20"N 108o 59' 24"W

  2. Anonymous5:23 PM

    Climate change, yet another violation of our rights. The gov’t constantly violates our rights.
    They violate the 1st Amendment by caging protesters and banning books like “America Deceived II”.
    They violate the 4th and 5th Amendment by allowing TSA to grope you.
    They violate the entire Constitution by starting undeclared wars.
    Impeach Obama.
    Last link of “America Deceived II” before it is completely banned:

  3. i see clouds like smouldering cotton wool, americans people running into the hills. then the big wave of moulten lava will consume, flowing like a tsunami of fire over the land. those on high ground will not be spared. Be prepaired, it will be soon.


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