aftershock observation for the noto hanto earth- quake · ˙ 2 ( ˙3 5 ˙6) 225 bull. earthq. res....
TRANSCRIPT
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225
Bull. Earthq. Res. Inst.
Univ. Tokyo
Vol. pp.
* e-mail : [email protected]
Earthquake Research Institute, University of Tokyo, Institute of Seismology and Volcanology,
Graduate School of Science, Hokkaido University, Graduate School of Science and Technology,
Hirosaki University, Research Center for Prediction of Earthquakes and Volcanic Eruptions,
Graduate School of Science, Tohoku University, Faculty of Science, Chiba University, Graduate
School of Natural Science and Technology, Kanazawa University, Research Center for Seismology,
Shinichi Sakai , Aitaro Kato , Eiji Kurashimo , Takashi Iidaka , Toshihiro Igarashi ,
Naoshi Hirata , Takaya Iwasaki , Toshihiko Kanazawa , Shigeru Watanabe , Toshio
Haneda , Masaru Kobayashi , Katsumi Miura , Reiko Miura , Kiyoko Tagami , Izumi
Ogino , Mamoru Saka , Atshi Watanabe , Koji Miyakawa , Kei Katsumata , Hiroaki
Takahashi , Minoru Kasahara , Ryo Honda , Takahiro Maeda , Masayoshi Ichiyanagi ,
Teruhiro Yamaguchi , Masahiro Kosuga , Tomomi Okada , Junichi Nakajima , Shu-
ichiro Hori , Takashi Nakayama , Kyohei Nii , Akira Hasegawa , Toshio Kono , Shuichi
Suzuki , Noriko Tsumura , Risa Kobayashi , Kenji Nozaki , Yoshihiro Hiramatsu ,
Katsunori Sugaya , Aiko Hayashi , Tetsuya Hirose , Akihiro Sawada , Keisuke Ta-
naka , Yoshiko Yamanaka , Haruhisa Nnakamichi , Takashi Okuda , Yoshihisa Iio ,
Kin’ya Nishigami , Masatoshi Miyazawa , Hiroo Wada , Norio Hirano , Setsuo Nakao ,
Hiroshi Katao , Shiro Ohmi , Kiyoshi Ito , Takuo Shibutani , Yasuyuki Kano , Issei
Doi , Shunta Noda , Takeshi Katagi , Yohei Nishitsuji , Satoshi Matsumoto , Ken
Matsushima , Atsushi Saiga , Hiroki Miyamachi , Kazutoshi Imanishi , Yasuto Kuwa-
hara , Ikuo Cho , Makoto Hoshino , Tetsuya Takeda , Yoichi Asano , Yohei Yuku-
take , Tomotake Ueno , Takuto Maeda , Takanori Matsuzawa , Syutaro Sekine ,
Makoto Matsubara and Kazushige Obara
Aftershock Observation for the Noto Hanto Earth-
quake
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Fig. . Seismicity in and around the Noto Peninsula in Central Japan. Distribu-
tion of the micro earthquakes was determined by JMA. Star indicates the epi-
center of the main shock of the Noto Hanto Earthquake.
Volcanology and Disaster Mitigation, Graduate School of Environmental Studies, Nagoya Univer-
sity, Disaster Prevention Research Institute, Kyoto University, Institute of Seismology and Vol-
canology, Faculty of Sciences, Kyushu University, Faculty of Science, Kagoshima University,
National Institute of Advanced Industrial Science and Technology, National Research Institute
for Earth Science and Disaster Prevention
The Noto Hanto Earthquake occurred on March , , in the Noto Peninsula, central
Japan. A half day after the main shock, we started installing temporary seismic stations in order to
determine the precise locations of its aftershocks. Ten universities and two research institutes
deployed temporary seismic stations in and around the source area. The observation lasted for
about two months. We relocated aftershocks with arrival time corrections at each station. The
relocated hypocenters show relatively small errors, less than . km in the horizontal direction and
less than . km depth. Most of the relocated hypocenters are about . km shallower than those
determined by JMA. The precise aftershock distribution extends into a shallower area than the
original, and it coincides with sea floor ward extension of the active faults previously known by a
sonic reflection survey.
: Noto Hanto Earthquake, aftershock observation, hypocenter distribution
GPS
M . cm cm
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Abstract
Key words
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Fig. . Location map of the stations by the group for the Noto
hanto Earthquake with the telemetered seismic stations.
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Fig. . Spatial and temporal distribution of the seismic stations. Open triangles, the solid tri-
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Table . Summary of the operation period, recorder, sensor, sensitivity, natural frequency, and locations
of the temporary stations.
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Table . -wave velocity structure models
used for hypocenter determination.
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Fig. . Station corrections of and waves. Value of the station correction is color coded, blue corresponds to
the thin sediment and red corresponds to the thick sediment.
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Fig. . (a) Comparison between the hypocenters determined by JMA (end of line)
and those determined in this study (open circle). (b) NE-SW striking vertical
cross-section view of the hypocenters. The strike of the cross-section is de-
gree from north to east and perpendicular to the direction of the geological
structure in this region. (c) NW-SE striking vertical cross-section view of the
hypocenters. The epicenters determined by this temporary observation are lo-
cated approximate km shallower of those reported by the JMA routine
catalogue. (d) NE-SW striking vertical cross-section view of the hypocenters in
this study. (e) NW-SE striking vertical cross-section view of the hypocenters.
km
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Fig. . Spatial and temporal distribution of the aftershocks. Left is NE-SW striking vertical cross-section view.
Right is NW-SE striking vertical cross-section view. (a) (a ) Aftershocks for hours after the main shock were
represented. (b) (b ) Aftershocks from o’clock Mar. to o’clock Mar. were shown. (c) (c ) Aftershocks
from o’clock Mar. to o’clock were shown. (d) (d ) Aftershocks from Mar. to Apr. were shown. (e) (e )
Aftershocks from Apr. to May were shown.
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Obara, K., S. Hori, K. Kasahara, Y. Okada and S. Aoi, Hi-net :
Hirata, N. and M. Matsu’ura, Maximum-likelihood estima-
tion of hypocenter with origin time eliminated using
nonlinear inversion technique, ,
, .
.
Kato, A., S. Sakai, T. Iidaka, T. Iwasaki, E. Kurashimo, T.
Igarashi, N. Hirata, T. Kanazawa, and Group for the
aftershock observations of the Noto Hanto Earth-
quake, , Three-dimensional velocity structure in
the source region of the Noto Hanto Earthquake in
imaged by a dense seismic observation : Rift structure
related to the opening of the Japan Sea,
, .
Mikumo, T., H. Wada and M. Koizumi, , Seismotectonics
of the Hida region, central Honshu, Japan,
, .
National Research Institute for Earth Science and Disaster
Prevention (NIED), Earthquake mechanism informa-
tion, , http : //www.hinet.bosai.go.jp/topics/niigata
/.
High sensitivity seismograph network in Japan, ,
( ), Fall Meet. Suppl., Abstract S
A- .
Sakai, S., N. Hirata, A. Kato, E. Kurashimo, T. Iwasaki, and
T. Kanazawa, Multi-fault system of the Mid-
Niigata Prefecture Earthquake and its aftershocks,
, , .
Sakai, S., A. Kato, T. Iidaka, T. Iwasaki, E. Kurashimo, T.
Igarashi, N. Hirata, T. Kanazawa, and Group for the
aftershock observations of the Noto Hanto Earth-
quake, , Highly resolved distribution of aftershocks
of the Noto Hanto Earthquake by a dense seismic
observation, , .
Yamada, T., K. Mochizuki, M. Shinohara, T. Kanazawa, A.
Kuwano, K. Nakahigashi, R. Hino, K. Uehira, T. Yagi, N.
Takeda, and S. Hashimoto, , Aftershock observa-
tion of the Noto Hanto earthquake in using ocean
bottom seismometers, (in submit-
ted).
Yamanaka, Y., EIC Seismological Note, , http : //www.
eri.u-tokyo.ac.jp/sanchu/Seismo Note/ /EIC .
html, (in Japanese).
(Received January , )
(Accepted January , )
, ,
Sakai Kato
Sakai
. M .
P
M .
M .
. km
. km Kato
:
Phys. Earth Planet.Inter.,
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