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- W2892381337 abstract "In November 2010, a 30 m wide and 17 m deep sinkhole occurred in a residential area of Schmalkalden, Germany. Subsequent geoscientific investigations showed that the collapse was naturally caused by the dissolution of sulfates below 80 m depth. In 2012, the Thuringian State Institute for Environment and Geology (TLUG) established an early warning system including 3C borehole geophones deployed in 50 m depth around the backfilled sinkhole. During the acquisition of two shallow 2D shear wave seismic profiles in the vicinity of the sinkhole, the signals generated by a micro-vibrator at the surface were additionally recorded by the four borehole geophones of the early warning system and a vertical seismic profiling (VSP) probe in a fifth borehole. Travel time analysis of the direct P- and S-wave arrivals enhances the understanding of wave propagation in the area. Seismic velocity anomalies are detected and related to the structural seismic images of the 2D profiles. In case of travel paths perpendicular to faults, the velocity is decreased, whereas the velocity of waves travelling parallel to the strike direction of faults is not significantly lowered. The combination of receivers located at the surface recording reflected seismic waves and distributed downhole receivers recording direct waves, enables analyzing of seismic wave propagation and velocities in more detail and beyond 2D. Therefore, the experiment setup will be further extended in future. The presented method shows the potential to locate instable zones in a sinkhole area. In our further research we propose to evaluate the suitability of the method for the time lapse monitoring of changes in the seismic wave propagation, which could be related to subrosion processes." @default.
- W2892381337 created "2018-09-27" @default.
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- W2892381337 date "2018-01-01" @default.
- W2892381337 modified "2023-10-02" @default.
- W2892381337 title "Combination of 2D Shear Wave Reflection Seismics and Travel Time Analysis of Borehole Geophone Data for the Investigation of a Sinkhole Area" @default.
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- W2892381337 doi "https://doi.org/10.5038/9780991000982.1019" @default.
- W2892381337 hasPublicationYear "2018" @default.
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