GPS observation of the first month of postseismic crustal deformation associated with the 2003 Tokachi-oki earthquake (MJMA 8.0), off southeastern Hokkaido, Japan

Hiroaki Takahashi, Shigeru Nakao, Noritoshi Okazaki, Junji Koyama, Takeshi Sagiya, Takeo Ito, Fumio Ohya, Kazutoshi Sato, Yasuyoshi Fujita, Manabu Hashimoto, Yoshinobu Hoso, Teruyuki Kato, Takeshi Iinuma, Jun’ichi Fukuda, Takeshi Matsushima, Yuhki Kohno, Minoru Kasahara

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Abstract

To investigate the postseismic crustal deformation associated with the Tokachi-oki earthquake (MJMA=8.0) of 26 September 2003 in Japan Standard Time (JST), off southeastern Hokkaido, Japan, we newly established thirty GPS sites just after the mainshock in the eastern part of Hokkaido. Rapid data analysis for one month after the mainshock clearly indicated postseismic displacements only in the horizontal components. Observed maximum horizontal displacement was 6.6 cm from 28 September to 24 October, 2003. Absence of the vertical suggests that afterslip occurred in and around the coseismic fault rather than at downdip extension. Time series of coordinates are characterized by logarithmic decay functions with 4-11 days relaxation times. This suggests that postseismic deformation was due to afterslip on the fault following the large earthquake.

Original languageEnglish
Pages (from-to)377-382
Number of pages6
Journalearth, planets and space
Volume56
Issue number3
DOIs
Publication statusPublished - Jan 1 2004

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crustal deformation
Japan
GPS
earthquakes
earthquake
relaxation time
time series
decay
data analysis

All Science Journal Classification (ASJC) codes

  • Geology
  • Space and Planetary Science

Cite this

GPS observation of the first month of postseismic crustal deformation associated with the 2003 Tokachi-oki earthquake (MJMA 8.0), off southeastern Hokkaido, Japan. / Takahashi, Hiroaki; Nakao, Shigeru; Okazaki, Noritoshi; Koyama, Junji; Sagiya, Takeshi; Ito, Takeo; Ohya, Fumio; Sato, Kazutoshi; Fujita, Yasuyoshi; Hashimoto, Manabu; Hoso, Yoshinobu; Kato, Teruyuki; Iinuma, Takeshi; Fukuda, Jun’ichi; Matsushima, Takeshi; Kohno, Yuhki; Kasahara, Minoru.

In: earth, planets and space, Vol. 56, No. 3, 01.01.2004, p. 377-382.

Research output: Contribution to journalArticle

Takahashi, H, Nakao, S, Okazaki, N, Koyama, J, Sagiya, T, Ito, T, Ohya, F, Sato, K, Fujita, Y, Hashimoto, M, Hoso, Y, Kato, T, Iinuma, T, Fukuda, J, Matsushima, T, Kohno, Y & Kasahara, M 2004, 'GPS observation of the first month of postseismic crustal deformation associated with the 2003 Tokachi-oki earthquake (MJMA 8.0), off southeastern Hokkaido, Japan', earth, planets and space, vol. 56, no. 3, pp. 377-382. https://doi.org/10.1186/BF03353068
Takahashi, Hiroaki ; Nakao, Shigeru ; Okazaki, Noritoshi ; Koyama, Junji ; Sagiya, Takeshi ; Ito, Takeo ; Ohya, Fumio ; Sato, Kazutoshi ; Fujita, Yasuyoshi ; Hashimoto, Manabu ; Hoso, Yoshinobu ; Kato, Teruyuki ; Iinuma, Takeshi ; Fukuda, Jun’ichi ; Matsushima, Takeshi ; Kohno, Yuhki ; Kasahara, Minoru. / GPS observation of the first month of postseismic crustal deformation associated with the 2003 Tokachi-oki earthquake (MJMA 8.0), off southeastern Hokkaido, Japan. In: earth, planets and space. 2004 ; Vol. 56, No. 3. pp. 377-382.
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AU - Sagiya, Takeshi

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AU - Ohya, Fumio

AU - Sato, Kazutoshi

AU - Fujita, Yasuyoshi

AU - Hashimoto, Manabu

AU - Hoso, Yoshinobu

AU - Kato, Teruyuki

AU - Iinuma, Takeshi

AU - Fukuda, Jun’ichi

AU - Matsushima, Takeshi

AU - Kohno, Yuhki

AU - Kasahara, Minoru

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