Abstract
Hydraulic fracturing stress measurements have been performed in a limestone quarry near the Hohenzollern-Graben, a fault structure in SW Germany. The values of the two horizontal principal stresses were 24 and 15 bars at a depth of 25 m. The magnitude and the direction of the stresses agree with the results obtained by door-stopper measurements at the same location and the direction of the maximum horizontal principal stress derived from fault plane solutions of shallow earthquakes of this tectonic active area.
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