Abstract

Preservation of a historical bas-relief on a high rock face in a seismically active area in NE Bulgaria called for stability investigations including joint monitoring. Engineering geological investigations revealed structures liable to creep within the bedrock including joint deformations registered in spatial three components and angular deviations between joint faces. A distinct relationship between joint movement and individual earthquakes has been found and changes in deformation character have occurred in periods of increased seismicity. Temperature variations, and notably frost effects have been found to affect shallow joints. The paper describes a case in which relatively inexpensive monitoring has been successful in terms of interpretation of results.

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