Abstract
This paper presents the first results of stress determinations in the Bohemian Massif utilizing televiewer data from deeper boreholes. The televiewer survey was originally carried out by Geological Survey Ostrava for the purpose of studying fractures and bedding in coal basins to depths of 2 km. A reinterpretation of the amplitude logs reveal a large number of stress-induced borehole elongations (breakouts) which occur in a direction perpendicular to the maximum horizontal principal stress (SH). The breakout analysis in the Upper Silesian, Mseno and Kladno Basins indicates a dominant NW-SE direction of SH which is consistent with the pattern of stress orientation in Western Europe. The NE-SW trend observed in the Plzeň Basin is less reliable. A model for stress magnitude determinations is formulated as a linear programming problem. If the a priori information on rock strength properties is limited, it reduces to explicit formulas for stress regime estimates. The model is applied to data from the Upper Silesian Basin for which a compressional stress regime is derived.
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