Details

Autor(en) / Beteiligte

• LüSchen, Ewald
• SöLlner, Walter
• Hohrath, Achim
• Rabbel, Wolfgang
• Meissner, Rolf
• Brown, Larry
• Franke, Wolfgang
• Seifert, Friedrich
• Dürbaum, Hans‐Jürgen
• Fuchs, Karl

Titel

Integrated P‐ and S‐Wave Borehole Experiments at the Ktb‐Deep Drilling Site in the Oberpfalz Area (Se Germany)

Ist Teil von

• Continental Lithosphere: Deep Seismic Reflections, 1991, p.121-133

Ort / Verlag

Washington, D. C: American Geophysical Union

Erscheinungsjahr

1991

Quelle

Wiley Online Library All Obooks

Beschreibungen/Notizen

• Data are presented from integrated special experiments which have been performed in conjunction with a seismic 3‐D reflection survey at the KTB (Continental Deep Drilling Program) site in the Oberpfalz area. The main objective of our investigations 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, where the pilot‐borehole has reached a depth of 4000 m. The program described here consists of: shearwave 2‐D reflection profiling (SCMP) with two 10–12 km long lines crossing the KTB‐site, source: 2 horizontal vibrators with different orientations, 3‐component recording; shearwave moving source profiling (S‐MSP); downhole recording of the source points of the SCMP; vertical seismic profiling (VSP) down to 3660 m with different source azimuths and offsets (zero‐offset, 4 km, 8 km) and P‐ and S‐wave sources: 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. Seismic anisotropy revealed by polarization analysis and traveltimes of split shearwaves can be explained by the predominant azimuth and dip of rock foliation.