Global Positioning System Observation before and after the Hyogo-ken Nanbu Earthquake of January 17, 1995, Japan

Teruyuki Kato, Yasuhiro Hirata, Yoshiko Kotake, Shigeru Nakao, John Catane Patrick, Tsutomu Terashima, Toshikazu Chachin, Kunio Fujimori, Kazuro Hirahara, Yoshinobu Hoso, Kajuro Nakamura, Takehide Nakano, Keiichi Tadokoro, Ryuichi Ichikawa, Hiroo Inokuchi, Nobuhiro Isezaki, Tetsuya Iwabuchi, Minoru Kasahara, Fumiaki Kimata, Takashi OkudaHiroyuki Kumagai, Yamaoka Koshun, Atsuki Kubo, Takeshi Matsushima, Satoshi Miura, Shigeaki Otsuka, Takao Tabei, Hiroaki Takahashi, Akira Tokuyama, Takeyasu Yamamoto

Research output: Contribution to journalArticle

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Abstract

The Hyogo-ken Nanbu earthquake (MJMA 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 däformations 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 Data have been archived first by on-site recordings and later by tele-communcations at the Disaster Prevention Research Institute, Kyoto Univeristy. Temporary dense array terminated by the end of March, 1995. Further temporary occupations 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 distribution 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 distribution 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 estimate 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.

Original languageEnglish
Pages (from-to)181-207
Number of pages27
Journaljournal of the geodetic society of japan
Volume43
Issue number3
DOIs
Publication statusPublished - Jan 1 2001

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GPS
earthquake
monitoring
fault plane
strong motion
mechanics
occupation
disaster
kinematics
tectonics
rock
experiment
distribution
parameter

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

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Global Positioning System Observation before and after the Hyogo-ken Nanbu Earthquake of January 17, 1995, Japan. / Kato, Teruyuki; Hirata, Yasuhiro; Kotake, Yoshiko; Nakao, Shigeru; Patrick, John Catane; Terashima, Tsutomu; Chachin, Toshikazu; Fujimori, Kunio; Hirahara, Kazuro; Hoso, Yoshinobu; Nakamura, Kajuro; Nakano, Takehide; Tadokoro, Keiichi; Ichikawa, Ryuichi; Inokuchi, Hiroo; Isezaki, Nobuhiro; Iwabuchi, Tetsuya; Kasahara, Minoru; Kimata, Fumiaki; Okuda, Takashi; Kumagai, Hiroyuki; Koshun, Yamaoka; Kubo, Atsuki; Matsushima, Takeshi; Miura, Satoshi; Otsuka, Shigeaki; Tabei, Takao; Takahashi, Hiroaki; Tokuyama, Akira; Yamamoto, Takeyasu.

In: journal of the geodetic society of japan, Vol. 43, No. 3, 01.01.2001, p. 181-207.

Research output: Contribution to journalArticle

Kato, T, Hirata, Y, Kotake, Y, Nakao, S, Patrick, JC, Terashima, T, Chachin, T, Fujimori, K, Hirahara, K, Hoso, Y, Nakamura, K, Nakano, T, Tadokoro, K, Ichikawa, R, Inokuchi, H, Isezaki, N, Iwabuchi, T, Kasahara, M, Kimata, F, Okuda, T, Kumagai, H, Koshun, Y, Kubo, A, Matsushima, T, Miura, S, Otsuka, S, Tabei, T, Takahashi, H, Tokuyama, A & Yamamoto, T 2001, 'Global Positioning System Observation before and after the Hyogo-ken Nanbu Earthquake of January 17, 1995, Japan', journal of the geodetic society of japan, vol. 43, no. 3, pp. 181-207. https://doi.org/10.11366/sokuchi1954.43.181
Kato, Teruyuki ; Hirata, Yasuhiro ; Kotake, Yoshiko ; Nakao, Shigeru ; Patrick, John Catane ; Terashima, Tsutomu ; Chachin, Toshikazu ; Fujimori, Kunio ; Hirahara, Kazuro ; Hoso, Yoshinobu ; Nakamura, Kajuro ; Nakano, Takehide ; Tadokoro, Keiichi ; Ichikawa, Ryuichi ; Inokuchi, Hiroo ; Isezaki, Nobuhiro ; Iwabuchi, Tetsuya ; Kasahara, Minoru ; Kimata, Fumiaki ; Okuda, Takashi ; Kumagai, Hiroyuki ; Koshun, Yamaoka ; Kubo, Atsuki ; Matsushima, Takeshi ; Miura, Satoshi ; Otsuka, Shigeaki ; Tabei, Takao ; Takahashi, Hiroaki ; Tokuyama, Akira ; Yamamoto, Takeyasu. / Global Positioning System Observation before and after the Hyogo-ken Nanbu Earthquake of January 17, 1995, Japan. In: journal of the geodetic society of japan. 2001 ; Vol. 43, No. 3. pp. 181-207.
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T1 - Global Positioning System Observation before and after the Hyogo-ken Nanbu Earthquake of January 17, 1995, Japan

AU - Kato, Teruyuki

AU - Hirata, Yasuhiro

AU - Kotake, Yoshiko

AU - Nakao, Shigeru

AU - Patrick, John Catane

AU - Terashima, Tsutomu

AU - Chachin, Toshikazu

AU - Fujimori, Kunio

AU - Hirahara, Kazuro

AU - Hoso, Yoshinobu

AU - Nakamura, Kajuro

AU - Nakano, Takehide

AU - Tadokoro, Keiichi

AU - Ichikawa, Ryuichi

AU - Inokuchi, Hiroo

AU - Isezaki, Nobuhiro

AU - Iwabuchi, Tetsuya

AU - Kasahara, Minoru

AU - Kimata, Fumiaki

AU - Okuda, Takashi

AU - Kumagai, Hiroyuki

AU - Koshun, Yamaoka

AU - Kubo, Atsuki

AU - Matsushima, Takeshi

AU - Miura, Satoshi

AU - Otsuka, Shigeaki

AU - Tabei, Takao

AU - Takahashi, Hiroaki

AU - Tokuyama, Akira

AU - Yamamoto, Takeyasu

PY - 2001/1/1

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N2 - The Hyogo-ken Nanbu earthquake (MJMA 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 däformations 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 Univeristy. Temporary dense array terminated by the end of March, 1995. Further temporary occupations 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 distribution 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 distribution 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 estimate 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.

AB - The Hyogo-ken Nanbu earthquake (MJMA 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 däformations 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 Univeristy. Temporary dense array terminated by the end of March, 1995. Further temporary occupations 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 distribution 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 distribution 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 estimate 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.

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