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Accession number;03A0714644
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| Title;Temporal Variation of Coseismic Slip on a Plate Interface in Subduction Zone: Based on Two-dimensional Modeling. |
| Author;
SATO KACHISHIGE
(Tokyo Gakugei Univ.)
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Journal Title;Bulletin of Tokyo Gakugei University. Section 4. Mathematics and Natural Sciences
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Journal Code:G0326A
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ISSN:0371-6813
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VOL.55;NO.;PAGE.51-57(2003)
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| Figure&Table&Reference;FIG.5, REF.10 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Temporal variation of coseismic slip on a plate interface in a subduction zone has been investigated through numerical modeling with a two-dimensional finite element method. A simplified two-layered model of the hanging wall side with elastic plate underlain by a viscoelastic mantle is considered. Downward displacement with a constant velocity due to drag by the subducting oceanic plate is imposed for 100 years along the plate interface within a depth range of 14-52km and then the accumulated strain energy is abruptly released. Such a process, which corresponds to that in reality consisting of interseismic deformation and earthquake occurrence, is cyclically repeated for 3000 years. It is found that, when the mantle is approximated by a viscoelastic body which is almost identical to the Maxwell type, the amount of coseismic slip gradually increases with time so that it eventually equals the accumulated displacement during 100 years. When gravity is taken into account, the coseismic slip within the elastic plate is initially quite small. However, it ultimately becomes almost the same as the one without gravity. (author abst.) |
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