seismic exploration using active sources at kuchi ...seismic exploration using active sources at...
TRANSCRIPT
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Seismic Exploration Using Active Sources at Kuchi-
erabujima Volcano, Southwest Japan
Masato Iguchi+�*, Keigo Yamamoto+�, Takeshi Hashimoto,�, Tomoki Tsutsui-�, Satoru
Tanaka.�, Shin’ya Onizawa/�, Yosuke Aoki0�, Toshiki Watanabe1�, Takahiro Ohkura2�,
Hiroshi Shimizu3�, Hiroshi Yakiwara+*�, Hiroki Miyamachi+*�, Hideyuki Hiramatsu++�, Take-
shi Tameguri+�, Tetsuro Takayama+�, Masayo Fukushima+�, Hetty Triastuty+�, Kazuhiro
Ishihara+�, Hiromitsu Oshima,�, Atsuo Suzuki,�, Tokumitsu Maekawa,�, Tatsuya Kajii-�,
Yoshiaki Watanabe-�, Yohei Ogiwara.�, Kenji Nogami/�, Mitsuhiro Oikawa/�, Jun-ichi
Hirabayashi/�, Hiroshi Tsuji0�, Yasuhiro Hirata0�, Takashi Okuda1�, Taku Itoh1�, Shin
Yoshikawa2�, Hiroyuki Inoue2�, Sayaka Ikeda2�, Mio Hori3�, Masaki Saito3�, Shuichiro
Hirano+*�, Yudai Uekama+*�, Motoharu Iguchi++�, Takahiro Takeshita+,� and Takehiko
Mori2�
+�Disaster Prevention Research Institute, Kyoto University, ,�Graduate School of Science, Hokkaido
University, -�Faculty of Engineering and Resource Science, Akita University, .�Graduate School of
Science, Tohoku University, /�Volcanic Fluid Research Center, Tokyo Institute of Technology,0�Earthquake Research Institute, University of Tokyo, 1�Graduate School of Science, Nagoya
University, 2�Graduate School of Science, Kyoto University, 3�Graduate School of Science, Kyushu
University, +*�Faculty of Science, Kagoshima University, ++�Fukuoka District Meteorological Obser-
vatory, +,�Kagoshima Local Meteorological Observatory
Abstract
Seismic exploration using artificial sources was conducted at Kuchierabujima volcano, south-
west Japan in November ,**. by .* participants from 3 national universities and Japan Meteoro-
logical Agency to investigate the subsurface seismic structure. The exploration was the ++th joint
experiment under the National Project for Prediction of Volcanic Eruptions. A total of +2- temporal
stations equipped with a ,Hz vertical component seismometer (including 1/ --component seismome-
ters) and a portable data logger were deployed on Kuchierabu Island. Dynamite shots with charges
of +*�++/kg were detonated at +3 locations, and seismic signals were successfully recorded. To
* e-mail : [email protected] ¡23+�+.+3 ��<¢£<¤�) +1,,�+3�
� � x y z ¥ ¦Bull. Earthq. Res. Inst.
Univ. TokyoVol. 2* ,**/� pp. ++�.*
§ 11 §
reveal the P-wave velocity structure, ,3// arrival times of the first motion were picked from the
seismograms, and ,+21 were classified into ranks A and B. From the record sections and the arrival
time data, characteristics reflecting the geological structure were identified. Refracted waves of /
km/s were observed at stations�/km from the shot points. Apparent velocities near the shot
points depend on the surface geology around the shots. P-wave arrived earlier at stations near the
summits. Strongly scattered waves were observed similarly near the summits.
Key words : Kuchierabujima volcano, seismic exploration, seismic velocity structure, National Pro-
ject for Volcanic Eruption
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Fig. 2. Plots of travel times for (a) Shot S+, (b) Shot S,, (c) Shot S-, (d) Shot S., (e) Shot S/, (f) Shot S0. The
reduction velocity is /.* km/s.
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Fig. 3. Plots of travel times for the shots at the flank of Kuchierabujima. (a) Shot S1, (b) Shot S2, (c) Shot
S3, (d) Shot S+*, (e) Shot S++, (f) Shot S+,, (g) Shot S+-, (h) Shot S+., (i) Shot S+/ and (j) Shot S+0. The
reduction velocity is /.*km/s.
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Fig. +*. Plots of travel times for the shots at the summit of Kuchierabujima. (a) Shot S+1, Shindake, (b) Shot
S+2, Furudake and (c) Shot S+3, Noike. The reduction velocity is /.*km/s.
Fig. ++. Plots of travel times for (a) Shot S+, (b) Shot S,, (c) Shot S-, (d) Shot S., (e) Shot S/, (f) Shot S0.
Open and solid circles indicate travel times of stations at the flank (Line A-D) and near the summits (Line
E-L), respectively. The reduction velocity is /.* km/s. Elevation correction is made on travel times.
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Table +�+. Locations of seismic stations. The coordinates are based on WGS2..
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Table +�,. (continued)
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� 24 �
Table +�-. (continued)
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� 25 �
Table +�.. (continued)
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� 26 �
Table ,. Shot locations, times and charge sizes for +3 explosions in the experiment.
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� 27 �
Table -�+. Arrival times and polarities of the first motions for shots S+ to S0.
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� 28 �
Table -�,. (continued)
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� 29 �
Table -�-. (continued)
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� 30 �
Table -�.. (continued)
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� 31 �
Table .�+. Arrival times and polarities of the first motions for shots S1 to S+,.
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� 32 �
Table .�,. (continued)
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� 33 �
Table .�-. (continued)
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� 34 �
Table .�.. (continued)
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� 35 �
Table /�+. Arrival times and polarities of the first motions for shots S+- to S+3.
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� 36 �
Table /�,. (continued)
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� 37 �
Table /�-. (continued)
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� 38 �
Table /�.. (continued)
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� 39 �
Table 0. Apparent P-wave velocities near the shot points.
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