High-Resolution P-wave Seismic Reflection Imaging of the ... · forelimb of the Yoro...
Transcript of High-Resolution P-wave Seismic Reflection Imaging of the ... · forelimb of the Yoro...
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High-Resolution P-wave Seismic Reflection Imaging of
the Yoro Active Thrust: ,**. Shizu Profile
Tatsuya Ishiyama+�*, Hiroshi Sato,�, Shigeru Toda-�, Toshimichi Nakanishi.�, Nobuhisa
Matsuta/�, Nobuhiko Sugito0�, Hiroyuki Tsutsumi1�, Atsumasa Okada2�, Taro Koike3�,
Tomohiro Imamura+*�, Yasuhisa Hattori++�, Norimasa Suzuki+,�, Keigo Amano+-�, Yoshito
Kato+.�, Yohei Kawai+/� and Keiji Takaki+0�
+�Active Fault Research Center, National Institute of Advanced Industrial Science and Technology
(Present Address : Graduate School of Science, Tohoku University), ,�Earthquake Research Insti-
tute, the University of Tokyo, -�Aichi University of Education, .� Institute of Geology and Geoinfor-
mation, National Institute of Advanced Industrial Science and Technology (Present Address : Public
Works Research Institute), /�Earthquake Research Institute, the University of Tokyo (Present
Address : National Taiwan University), 0�Graduate School of Science, Kyoto University (Present
Address : Research Center for Seismology, Volcanology and Disaster Mitigation, Graduate School of
Environmental Studies, Nagoya University), 1�Graduate School of Science, Kyoto University, 2�
Graduate School of Science, Kyoto University (Present Address : Research Center for Disaster
Mitigation of Urban Cultural Heritage, Ritsumeikan University), 3�Geosys, Inc., +*�Graduate School
of Science, Kyoto University (Present Address : Tango Civil Engineering O$ce, Kyoto Prefecture), ++�
Graduate School of Science, Kyoto University (Present Address : Japan Energy Co., Ltd.), +,�Aichi
University of Education (Present Address : Toyota Municipal Wakazono Junior High School), +-�
Aichi University of Education (Present Address : Mitsubishi Electric Co., Ltd.), +.�Aichi University of
Education (Present Address : Nishio Municipal Nishio Junior High School), +/�Aichi University of
Education (Present Address : Toyota Auto Body Co., Ltd.), +0�Aichi University of Education (Present
Address : Sanaru Co., Ltd.)
Abstract
We present new, high-resolution seismic reflection data (,**. Shizu profile) acquired across the
forelimb of the Yoro basement-involved fold to further image its subsurface geometry. A seismic
source (mini-vibrator) and +2*-channel digital telemetry recording system were used in an o#-end
configuration with the nearest receiver adjacent to the source to record seismic waves from deeper
* e-mail : [email protected] K�32*�2/12 �dw����� �� 0�-�
V W A B C ¡ ^Bull. Earthq. Res. Inst.
Univ. TokyoVol. 2, K,**1� pp. 0/�1.
¢ 65 ¢
reflection points. A +*-m source and geophone spacing give a /-m CMP (common midpoint) spacing
on the final section. The nominal CMP stacking fold had 3* traces. We also suppressed coherent
noise by repeating source points 1�+* times. After data processing including surface-consistent
statics, velocity analysis, normal moveout (NMO) correction, residual statics, CMP stack, and mi-
gration, the section was finally depth-converted using of stacking velocities. Reflectors imaged on
the seismic profile illuminate growth strata on the forelimb of the Yoro basement-involved fold,
providing insights into the kinematic solution of the underlying active thrust.
Key words : active fault, Yoro fault, seismic reflection profile, subsurface structure, central Japan
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Fig. +. (a) Shaded relief map based on ,/* m digital elevation model (DEM) (Kishimoto et al., ,***) showing the
topography and distribution of active faults within the Kinki region, central Japan. Locations of active faults
are from Nakata and Imaizumi (,**,). Red, orange, and gray lines mark active faults that are precisely located,
approximately located, and inferred, respectively. Barbs denote hangingwalls of active thrusts. Arrows in-
dicate slip directions of strike-slip faults. Abbreviations for metropolitan areas are : KB : Kobe, OK : Osaka, KT :
Kyoto, NG : Nagoya. (b) Regional Geologic Map of the Nobi-Ise fault zone including Yoro fault (modified from
Ishiyama et al., ,**1). Geologic units are modified from Miyamura et al. (+310), Takada et al. (+313), Yoshida
(+32. ; +322), Harayama et al. (+323), and Yoshida et al. (+33+). Red line with solid circles indicates location of the
seismic line in this study.
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Fig. ,. Detailed topographic map showing locations of survey line with receiver points and stack line with CMP
(common midpoint) numbers. Locations of active fold scarps along the Yoro fault is redrawn from Ikeda et al.(,**,).
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Table +. Recording parameters for the ,**. Shizu
seismic reflection profile.
Fig. -. Shot gathers obtained at shot points +*03, ++20, and +-+0.
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Fig. .. Flowchart of data processing.
Table ,. Processing parameters for the ,**.
Shizu seismic reflection profile.
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Fig. /. (a) Near-surface velocity structure based on refraction statics calculation. Dark gray, light gray and
dashed lines indicate velocity of the bottoms of weathered and underlying two layers, respectively. (b) Receiver
(open squares) and source (solid circles) statics to final datum based on refraction statics calculation.
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Fig. 1. (a) Filtered stack section and (b) migrated time section based on data processing.
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//www.hp+*-3.jishin.go.jp/kozo/Aichi0Cfrm.htm.
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Ishiyama T., K. Mueller, M. Togo, A. Okada, K. Takemura,
,**., Geomorphology, kinematic history, and earth-
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anticline, central Japan, J. Geophys. Res., +*3, B+,.*2,
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basement-involved Yoro thrust, central Japan, J. Geo-phys. Res., doi : +*.+*,3/,**0JB**.-11.
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