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Abstract

The Ruhr area is the biggest urban agglomeration and is well known for its coal mining activities. In consequence of the former underground mining numerous artificial caves near to the surface can be found. These caves lead to earth drops and sinkholes which form a safety hazard for the environment. In this presentation a case study of a geophysical investigation will be shown whereat seismic and geoelectric methods were applied close to an area where several historic coal mines were placed. Six survey profiles were planned whereas five were mainly parallel and one perpendicular to a main geologic fault. The survey lines had an overall length of approx. 1000 m and covered a region of 14 000 sqm. The seismic data were analyzed using the following methods: standard refraction processing (wavefront method), refraction tomography, single shot analysis for gaps in the refracting waves, reflection processing and tomographic velocity analysis of the transverse travelling surface waves. The geoelectric data were processed using a 2-D inversion approach. All processing methods showed a number of anomalous zones. It became visible that the anomalies form several clusters which can be interpreted as second order fault positions with a typical appearance for wrench faults.

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/content/papers/10.3997/2214-4609.20131383
2013-09-09
2024-03-29
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