Long Valley Exploratory Well

Deep Scientific Drilling in a Large, Restless Caldera

A scientific drilling effort has been proposed to deepen an existing 2-km deep hole to a target depth of between 3.5 and 4.0 km. The borehole is located near the center of the resurgent dome of Long Valley Caldera in east-central California. Deepening the well has been accomplished by continuous H-size coring (2.5" diameter core) to the target depth. Long Valley Caldera has shown sustained unrest since 1980 characterized by recurring earthquake swarms, inflation (dome-shaped uplift) of the resurgent dome, and increased levels of fumarolic activity accompanied by high concentrations of carbon dioxide (CO2) gas in the soils around Mammoth Mountain on the southwest margin of the caldera.

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