In-situ stress and fracture permeability in the Long Valley Caldera

This study examined the relationship between in situ stress, fractures and fluid flow in the Long Valley Exploratory Well (LVEW) which penetrates fractured and faulted volcanic rocks of the Long Valley Caldera in the eastern Sierra Nevada. Utilizing data from detailed analyses of stress magnitude, fracture geometry and precision temperature logs (that indicate localized fluid flow) results indicate that fluid flow along potentially active faults appears to contribute substantially to the bulk hydraulic conductivity in situ.