Long Valley Caldera Outline

Long Valley Caldera Outline - THESIS: The Long Valley...

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The Long Valley Caldera in Mammoth Lakes, California is a crater caused by a violent volcanic eruption in recent geologic history. It undergoes regular volcanism that indicates the possibility of yet another eruption in the future. The geologic and eruptive history of the caldera show the volcano’s ancient patterns of activity and allow for inferences about the future. Since 1980 the caldera has been experiencing significantly strong volcanic unrest. The United States Geological Survey (USGS) conducts various monitoring operations in and around the caldera. I. Long Valley Caldera’s geology and eruptive history is characterized by violent explosions, often of rhyolitic magma. A. Volcanic activity that eventually led to the formation of the Long Valley Caldera began approximately 3.6 million years ago. i. White Mountains and Sierra Nevada fault systems began experiencing earthquakes. ii. A magma chamber began to grow, eventually covering a 4000 square kilometer area beneath the surface. iii. Earthquakes caused eruptions of basaltic and andesitic lava to flow over about 1500 square miles. B. Approximately 2.5 million years go volcanic activity began to concentrate in the area where the Long Valley Caldera is today. i.
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This note was uploaded on 04/24/2008 for the course EES 211 taught by Professor Halsor during the Spring '08 term at Wilkes.

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Long Valley Caldera Outline - THESIS: The Long Valley...

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