--> Figure 2

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Figure 2. Elastic stress-solution. Data points represent the measured elastic constants for MWX site rocks. Sandstones are blue dots and triangles are red dots. The solid curves represent the boundaries between compression and tension for specific pore-pressure gradients. If a rock falls to the right of the curve, it will experience tensile stress for the indicated pore pressure and will probably fracture. See text for additional explanation.