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Title: 兵庫県南部地震(1995年1月17日)におけるGPS観測
Other Titles: Global Positioning System Observation before and after the Hyogo-ken Nanbu Earthquake of January 17, 1995, Japan
Authors: 加藤, 照之1 Browse this author
Catane, John Patrick L.2 Browse this author
茶珎, 俊一3 Browse this author
藤森, 邦夫4 Browse this author
平原, 和朗5 Browse this author
平田, 安廣6 Browse this author
細, 善信7 Browse this author
市川, 隆一8 Browse this author
井口, 博夫9 Browse this author
伊勢崎, 修弘10 Browse this author
岩淵, 哲也11 Browse this author
笠原, 稔12 Browse this author →KAKEN DB
木股, 文昭13 Browse this author
小竹, 美子14 Browse this author
久保, 篤規15 Browse this author
熊谷, 博之16 Browse this author
松島, 健17 Browse this author
三浦, 哲18 Browse this author
中村, 佳重郎19 Browse this author
中野, 健秀20 Browse this author
中尾, 茂21 Browse this author
奥田, 隆22 Browse this author
大塚, 成昭23 Browse this author
田部井, 隆雄24 Browse this author
田所, 敬一25 Browse this author
高橋, 浩晃26 Browse this author →KAKEN DB
寺島, 敦27 Browse this author
徳山, 明28 Browse this author
山本, 剛靖29 Browse this author
山岡, 耕春30 Browse this author
Authors(alt): KATO, Teruyuki1
CATANE, John patrick l.2
CHACHIN, Toshikazu3
HIRATA, Yasuhiro6
HOSO, Yoshinobu7
ICHIKAWA, Ryuichi8
ISEZAKI, Nobuhiro10
IWABUCHI, Tetsuya11
KASAHARA, Minoru12
KIMATA, Fumiaki13
KOTAKE, Yoshiko14
KUBO, Atsuki15
KUMAGAI, Hiroyuki16
MIURA, Satoshi18
NAKAMURA, Kajuro19
NAKANO, Takehide20
NAKAO, Shigeru21
OKUDA, Takashi22
OTUSKA, Shigeaki23
TABEI, Takao24
TADOKORO, Keiichi25
TAKAHASHI, Hiroaki26
TERASHIMA, Tsutomu27
YAMAMOTO, Takeyasu29
YAMAOKA, Koshun30
Issue Date: 25-Sep-1997
Publisher: 日本測地学会
Journal Title: 測地学会誌
Volume: 43
Issue: 3
Start Page: 181
End Page: 207
Publisher DOI: 10.11366/sokuchi1954.43.181
Abstract: The Hyogo-ken Nanbu earthquake (M<SUB>JMA</SUB>7.2), that took place on January 17th, 1995, in Kobe and Awaji area, caused tremendous disasters in the areas. After the earthquake, the Japanese University Consortium for GPS Research (JUNCO) deployed more than 30 GPS receivers around the hypocentral area to find co-seismic and to monitor post-seismic crustal deforma-tions related to the earthquake. Data have been archived first by on-site recordings and later by tele-communcations at the Disaster Prevention Research Institute, Kyoto Universsty. Temporary dense array terminated by the end of March, 1995. Further temporary occupa-tions were conducted in May, 1995, in November, 1995, and in March, 1996, as well as long term continuous monitorings at selected several sites. The monitorings ended in August, 1996. Co-seismic offsets were observed at several sites around the source area. The largest offsets amounted to 45cm at Iwaya site which is about 4 km east of the Nojima fault. These data were used for simultaneous inversion together with strong motion data to clarify slip dis-tribution on the buried rectangular faults. Post-seismic deformations were also found at all of sites. They mostly showed temporal decay and amounted to 2 to 3 cm. The largest one was observed at Iwaya site. The areal distri-bution of post-seismic displacement vectors seems to indicate afterslip on the fault planes, but not the areal visco-elastic readjustments. Relaxation processes at Iwaya and Kawaragi sites were fitted by a logarithmic curve. Application of a theory on the mechanics of afterslip based on the constitutive relationship of a fault surface indicated that the fitting give reasonable es-timate on the frictional rate parameter or the thickness of velocity-strengthning layer of the earth's surface. Assuming that the constitutive parameter is ranging from 0.001 to 0.005 based on the results of rock experiments, thicknesses of velocity-strengthning layer at Iwaya and Kawaragi were estimated to be ranging between 500m and 2 km, which is consistent with other seismological data. Monitoring of fault offsets using real-time kinematic GPS (RTK-GPS) were also conducted at two baselines crossing the Nojima fault and the Arima-Takatsuki tectonic line, respectively. Though significant deformation was not observed, it showed a potential capability of real time monitorings of ground deformations in a few centimeter accuracy.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 高橋 浩晃

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