矩形断層面上のディスロケーションに伴う準静的な歪・応力場に及ぼす3次元不均質粘弾性構造の影響

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タイトル別名
  • Effects of Three-dimensional Inhomogeneous Viscoelastic Structures on Quasi-static Strain and Stress Fields Associated with Dislocation on a Rectangular Fault
  • クケイ ダンソウメンジョウ ノ ディス ロケーション ニ トモナウ ジュン セ

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We investigated effects of various viscoelastic structures on transient strain and stress fields following thrust-type dislocation on a rectangular fault. For this purpose, we constructed two kinds of three-dimensional finite element models with different viscoelastic structures, namely, Layered Models and Plate Models: Maxwell viscoelastic asthenosphere is underlying elastic lithosphere for Layered Models, whereas the existence of a subducted oceanic plate, which is assumed to be elastic, is taken into account for Plate Models. Two different thicknesses of the elastic lithosphere are considered for the respective models. The results show that spatial patterns differ considerably, depending on the four viscoelastic structures. Overall deformation is small for Layered Model with thick elastic layer, as compared with other structural models. Remarkable difference in strain and stress fields can be seen in the vicinity of the lower edge of the fault plane, where viscoelastic structures among the models are quite different. As the elastic lithosphere becomes thin, the amount of transient deformation becomes large there in association with stress relaxation in the viscoelastic asthenosphere. From these results, we suggest that it would be necessary to use realistic Plate Models when we interpret postseismic deformations and seismic activity in relation to a thrust-type great earthquake at subduction zones, where lateral inhomogeneity in viscoelastic structure is remarkable.

収録刊行物

  • 地震　第２輯

    地震　第２輯 50 (3), 277-289, 1997

    公益社団法人 日本地震学会

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