Third-party borehole seismic experiments during the Ocean Drilling Program
Stephen, Ralph A.
Swift, Stephen A.
Bolmer, S. Thompson
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The first borehole seismic experiments on DSDP and ODP were two-ship Oblique Seismic Experiments (Stephen, 1979; Stephen, et al., 1979, 1980; Swift, et al., 1988). By recording on the drill ship and shooting explosives out to ranges of 8 km, the upper 1.5 km of the upper crust (Layer 2) adjacent to the borehole could be imaged (Fig. 1; Stephen and Harding, 1983), Azimuthal anisotropy (Stephen, 1981, 1985) and lateral heterogeneity (Stephen, 1988; Swift and Stephen, 1989) could also be studied by shooting circles of shots at a fixed range from the borehole,
© The Author(s), 2007. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Scientific Drilling Sepecial Iss. (2007): 107-109, doi:10.2204/iodp.sd.s01.08.2007.
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Stephen, Ralph A.; Koelsch, Donald E.; Berteaux, Henri O.; Bocconcelli, Alessandro; Bolmer, S. Thompson; Cretin, J.; Etourmy, N.; Fabre, A.; Goldsborough, Robert G.; Gould, Matthew R.; Kery, Sean M.; Laurent, J.; Omnes, G.; Peal, Kenneth R.; Swift, Stephen A.; Turpening, R.; Zani, A. Cleo (Woods Hole Oceanographic Institution, 1993-01)The Seafloor Borehole Array Seismic System (SEABASS) has been developed to measure the pressure and three dimensional particle velocity of the VLF sound field (2-50HZ) below the seafloor in the deep ocean (water depths ...
Stephen, Ralph A.; Swift, Stephen A. (Acoustical Society of America, 1994-08)A numerical scattering chamber (NSC) has been developed to compute backscatter functions for geologically realistic seafloor models. In the NSC, solutions are computed to the elastic (or anelastic) wave equation by the ...
Stephen, Ralph A.; Swift, Stephen A. (Acoustical Society of America, 1994-01)A major problem in understanding seismic wave propagation in the seafloor is to distinguish between the loss of energy due to intrinsic attenuation and the loss of energy due to scattering from fine scale heterogeneities ...