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  Integrated P- and S-Wave Borehole Experiments at the KTB-Deep Drilling Site

Lüschen, E., Söllner, w., Hohrath, A., Rabbel, W. (1990): Integrated P- and S-Wave Borehole Experiments at the KTB-Deep Drilling Site. - In: Emmermann, R., Lauterjung, J., Umsonst, T. (Eds.), KTB Report 90-6b: Integrated Seismics Oberpfalz 1989; Longterm Logging and Testing Programme of the KTB-Oberpfalz VB, Potsdam : Deutsches GeoForschungsZentrum GFZ, 85-134.
https://doi.org/10.48440/ktb.90-6b_5

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5011692 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5011692_2
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https://doi.org/10.2312/ktb.90-6b (Supplementary material)
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Is published in: Dürbaum, H.-J., Reichert, C., Bram, K. (Eds.)(1990): KTB Report 90-6b: Integrated Seismics Oberpfalz 1989; Longterm Logging and Testing Programme of the KTB-Oberpfalz VB, (KTB Reports; 90-6b)(DEKORP Report). https://doi.org/10.2312/ktb.90-6b

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 Creators:
Lüschen, E.1, Author
Söllner, w.1, Author
Hohrath, A.1, Author
Rabbel, W.1, Author
Affiliations:
1KTB Reports, External Organizations, ou_853888              

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 Abstract: Data are presented from integrated special experiments which have been performed in conjunction with a seismic 30 reflection survey within the framework of IS089 ( Integrated Sei smi cs Oberpfal z 1989) coordinated by DEKOR(PG erman Continental Seismic Reflection Program) between July and Novembero f 1989. The main objective was to study the nature of P- and S-wave reflections and velocities, the Poisson's ratio and the seismic anisotropy in a medium of crystalline rocks around the KTB site (Continental Deep Drilling Program), where the borehole has reached a depth of 4000 m. A digital 5-unit geophone chain with 25 m spacing and three components was used for downhole recording. The program described here consists of: 1) shearwave 2D reflection profiling (SCMPw} ith two 10-12 km long lines crossing the KTB-site, source: 2 horizontal vibrators with different orientations, 3-component recording; 2) shearwave moving source profiling (S-MSP); downhole recording of the source points of the SCMP; 3) vertical seismic profiling (VSP) down to 3660 m with different source azimuths and offsets (zero-offset, 4 km, 8 km); P- and S-wave sources: explosives, horizontal and vertical vibrators, and horizontal hammer techniques. 4) multiple azimuth shearwave experiment (MASE) with 4 km and 8 km offset and horizontal vibrator sources (radial and transversal orientation). The VSP surveys display steeply dipping reflections, increasing in number below 3000 m depth. Horizontal structures, preferentially seen in the surface profiling, are the exception. Polarization analysis of shearwaves shows dominant azimuths in shearwave splitting which correlate with maximum horizontal stress (N 158° E) and with azimuth and dip of foliation.

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Language(s): eng - English
 Dates: 19901990
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.48440/ktb.90-6b_5
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Title: KTB Report 90-6b: Integrated Seismics Oberpfalz 1989; Longterm Logging and Testing Programme of the KTB-Oberpfalz VB
Source Genre: Proceedings
 Creator(s):
Emmermann, R.1, Editor
Lauterjung , J.1, Editor
Giese, P., Author
Umsonst, T.1, Editor
Affiliations:
1 KTB Reports, External Organizations, ou_853888            
Publ. Info: Potsdam : Deutsches GeoForschungsZentrum GFZ
Pages: 50 Volume / Issue: 90-6b Sequence Number: - Start / End Page: 85 - 134 Identifier: DOI: 10.2312/ktb.90-6b