Abstract
Discussed in this paper are the P-wave and S-wave zero-offset VSPs carried out utilizing boreholes located in Nada Ward, Kobe City, and Hokudan-cho, Hyogo Prefecture, as part of the deep layer boring survey following Hanshin Earthquake Disaster. This effort aims at the elucidation of P-wave and S-wave velocity structures, high-precision identification of data obtained by the surface reflection method, and collection of basic data for active faults investigation in the future. Among the velocity structures obtained for various layers, the S-wave velocity structures in particular agree with the stratigraphy excellently and may be utilized in seismic analyses to be conducted in the future. Reflection from geological boundaries is received with precision, providing accurate information about correlation between reflection and geological cross sections. The records will be useful in formulating plans for reflection surveys for instance of the boundary between the Osaka group and Kobe group. Generally speaking, reflection coefficients are large when the reflection is from a boundary where difference is great in elastic wave impedance (mainly difference in velocity). In the case of the boundary between the Kobe group and granite in Awaji Island, however, no strong reflection is found despite the great difference in velocity. This is attributed
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Kinugasa, Y;
[1]
Feng, S;
Sugiyama, T;
Ishikawa, K
[2]
- Geological Survey of Japan, Tsukuba (Japan)
- Chuoh Kaihatsu Corp., Tokyo (Japan)
Citation Formats
Kinugasa, Y, Feng, S, Sugiyama, T, and Ishikawa, K.
Application of VSP to geological investigation; P ha oyobi S ha VSP wo mochiita shinso chishitsu chosa.
Japan: N. p.,
1997.
Web.
Kinugasa, Y, Feng, S, Sugiyama, T, & Ishikawa, K.
Application of VSP to geological investigation; P ha oyobi S ha VSP wo mochiita shinso chishitsu chosa.
Japan.
Kinugasa, Y, Feng, S, Sugiyama, T, and Ishikawa, K.
1997.
"Application of VSP to geological investigation; P ha oyobi S ha VSP wo mochiita shinso chishitsu chosa."
Japan.
@misc{etde_522625,
title = {Application of VSP to geological investigation; P ha oyobi S ha VSP wo mochiita shinso chishitsu chosa}
author = {Kinugasa, Y, Feng, S, Sugiyama, T, and Ishikawa, K}
abstractNote = {Discussed in this paper are the P-wave and S-wave zero-offset VSPs carried out utilizing boreholes located in Nada Ward, Kobe City, and Hokudan-cho, Hyogo Prefecture, as part of the deep layer boring survey following Hanshin Earthquake Disaster. This effort aims at the elucidation of P-wave and S-wave velocity structures, high-precision identification of data obtained by the surface reflection method, and collection of basic data for active faults investigation in the future. Among the velocity structures obtained for various layers, the S-wave velocity structures in particular agree with the stratigraphy excellently and may be utilized in seismic analyses to be conducted in the future. Reflection from geological boundaries is received with precision, providing accurate information about correlation between reflection and geological cross sections. The records will be useful in formulating plans for reflection surveys for instance of the boundary between the Osaka group and Kobe group. Generally speaking, reflection coefficients are large when the reflection is from a boundary where difference is great in elastic wave impedance (mainly difference in velocity). In the case of the boundary between the Kobe group and granite in Awaji Island, however, no strong reflection is found despite the great difference in velocity. This is attributed to the complicated, sharp inclination of the basement rock and to its weathering. 4 refs., 8 figs.}
place = {Japan}
year = {1997}
month = {May}
}
title = {Application of VSP to geological investigation; P ha oyobi S ha VSP wo mochiita shinso chishitsu chosa}
author = {Kinugasa, Y, Feng, S, Sugiyama, T, and Ishikawa, K}
abstractNote = {Discussed in this paper are the P-wave and S-wave zero-offset VSPs carried out utilizing boreholes located in Nada Ward, Kobe City, and Hokudan-cho, Hyogo Prefecture, as part of the deep layer boring survey following Hanshin Earthquake Disaster. This effort aims at the elucidation of P-wave and S-wave velocity structures, high-precision identification of data obtained by the surface reflection method, and collection of basic data for active faults investigation in the future. Among the velocity structures obtained for various layers, the S-wave velocity structures in particular agree with the stratigraphy excellently and may be utilized in seismic analyses to be conducted in the future. Reflection from geological boundaries is received with precision, providing accurate information about correlation between reflection and geological cross sections. The records will be useful in formulating plans for reflection surveys for instance of the boundary between the Osaka group and Kobe group. Generally speaking, reflection coefficients are large when the reflection is from a boundary where difference is great in elastic wave impedance (mainly difference in velocity). In the case of the boundary between the Kobe group and granite in Awaji Island, however, no strong reflection is found despite the great difference in velocity. This is attributed to the complicated, sharp inclination of the basement rock and to its weathering. 4 refs., 8 figs.}
place = {Japan}
year = {1997}
month = {May}
}