Unusual Change of the Crustal Strain Preceding the 1995 Hyogoken-nanbu Earthquake
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Accession number;07A0041905
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| Title;Unusual Change of the Crustal Strain Preceding the 1995 Hyogoken-nanbu Earthquake |
| Author;
MORII WATARU
(Kyoto Univ., Disaster Prev. Res. Inst., JPN)
ONOUE KENSUKE
(Kyoto Univ., Disaster Prev. Res. Inst., JPN)
NAKAMURA KAJURO
(Kyoto Univ., Disaster Prev. Res. Inst., JPN)
OYA FUMIO
(Kyoto Univ., Disaster Prev. Res. Inst., JPN)
HOSO YOSHINOBU
(Kyoto Univ., Disaster Prev. Res. Inst., JPN)
WADA YASUO
(Kyoto Univ., Disaster Prev. Res. Inst., JPN)
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Journal Title;Abstracts for Annuals. Disaster Prevention Research Institute, Kyoto University (CD-ROM)
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Journal Code:S0431B
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ISSN:
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VOL.;NO.49;PAGE.NO.49B,245-251(2006)
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| Figure&Table&Reference;FIG.7, TBL.4 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;The crustal movement records obtained at plural observatories distributed in the central part of Kinki district show the unusual change of the crustral strain which were kept on from the end of 1989 to the beginning of 1995. At the first, the contraction in the direction of north and south turned to increment and kept on increasing about 2.6 years. After that, the increment of the contraction became still for 2 years and half a year before the 1995 Hyogoken-nanbu earthquake strain rates turned to extension. This alternate change of the strain rate could not be explained qualitatively by the pre-slip of the active fault which raised the Hyogoken-nanbu earthquake. We explained this alternate change of strain rate as a result of interaction between the Philippine Sea plate and the lower crust of the Kii-pen. We think that a partial sticking between the Philippine Sea plate and lower crust of Kii-pen may raise the increment of the north-south contraction. The north-south extension may be raised by a slow slip event occurred after the release from the partial sticking between the plate and crust. Based on this hypothesis, we estimate crustal strain changes using simple models. The results of the estimation showed that models used could explain the alternate change of the strain rate qualitatively. (author abst.) |
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