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Main Title: Structural analysis of S-wave seismics around an urban sinkhole: evidence of enhanced dissolution in a strike-slip fault zone
Author(s): Tanner, David C.
Wadas, Sonja Halina
Polom, Ulrich
Krawcyk, Charlotte M.
Type: Article
Language Code: en
Is Part Of: 10.14279/depositonce-7247
Abstract: Abstract. In November 2010, a large sinkhole opened up in the urban area of Schmalkalden, Germany. To determine the key factors which benefited the development of this collapse structure and therefore the dissolution, we carried out several shear-wave reflection-seismic profiles around the sinkhole. In the seismic sections we see evidence of the Mesozoic tectonic movement in the form of a NW–SE striking, dextral strike-slip fault, known as the Heßleser Fault, which faulted and fractured the subsurface below the town. The strike-slip faulting created a zone of small blocks ( < 100m in size), around which steep-dipping normal faults, reverse faults and a dense fracture network serve as fluid pathways for the artesian-confined groundwater. The faults also acted as barriers for horizontal groundwater flow perpendicular to the fault planes. Instead groundwater flows along the faults which serve as conduits and forms cavities in the Permian deposits below ca. 60m depth. Mass movements and the resulting cavities lead to the formation of sinkholes and dissolution-induced depressions. Since the processes are still ongoing, the occurrence of a new sinkhole cannot be ruled out. This case study demonstrates how S-wave seismics can characterize a sinkhole and, together with geological information, can be used to study the processes that result in sinkhole formation, such as a near-surface fault zone located in soluble rocks. The more complex the fault geometry and interaction between faults, the more prone an area is to sinkhole occurrence.
Issue Date: 2017
Date Available: 16-Jan-2019
DDC Class: 550 Geowissenschaften
Subject(s): structural analysis
S-wave seismics
urban sinkhole
Journal Title: Natural Hazards and Earth System Sciences
Publisher: Copernicus
Publisher Place: Göttingen
Volume: 17
Publisher DOI: 10.5194/nhess-17-2335-2017
Page Start: 2335
Page End: 2350
ISSN: 1561-8633
Appears in Collections:Inst. Angewandte Geowissenschaften » Publications

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