Abstract
The hypothesis is advanced that, provided Young's modulus and Poisson's ratio of the rock are known, the length/width ratios of tension fractures can be used to estimate the tensile stress (assumed constant along the length of each fracture) at the time of fracture formation. The hypothesis is tested on a fissure swarm in a 10,000 year-old basaltic lava in Iceland. The length/width ratios of the fissures give the average tensile stress as of the order of a few MPa.
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