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Knowledge of the in situ stress in rock mass is required in the design of underground openings, in the earthquake studies, and in the extraction of oil and gas. The magnitudes and directions of in situ stresses, obtained by hydraulic fracturing, provide the crucial design parameters - layout (orientation, depth, and cross-sectional shape) of the opening, frictional strength of the fault, and orientation of the fracture propagation. The following are the examples of underground activities requiring the state of in situ stresses.

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Geothermal Drilling at Long Valley

Yucca Mt. Project

Large Scale Breakouts in URL

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Hydraulic Fracturing