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タイトル: | Characteristics of viscoelastic crustal deformation following a megathrust earthquake: discrepancy between the apparent and intrinsic relaxation time constants |
著者: | Fukahata, Yukitoshi https://orcid.org/0000-0002-1009-7366 (unconfirmed) Matsu’ura, Mitsuhiro |
著者名の別形: | 深畑, 幸俊 |
キーワード: | Viscoelastic relaxation Maxwell time megathrust earthquake postseismic deformation |
発行日: | Feb-2018 |
出版者: | Springer Nature |
誌名: | Pure and Applied Geophysics |
巻: | 175 |
号: | 2 |
開始ページ: | 549 |
終了ページ: | 558 |
抄録: | The viscoelastic deformation of an elastic–viscoelastic composite system is significantly different from that of a simple viscoelastic medium. Here, we show that complicated transient deformation due to viscoelastic stress relaxation after a megathrust earthquake can occur even in a very simple situation, in which an elastic surface layer (lithosphere) is underlain by a viscoelastic substratum (asthenosphere) under gravity. Although the overall decay rate of the system is controlled by the intrinsic relaxation time constant of the asthenosphere, the apparent decay time constant at each observation point is significantly different from place to place and generally much longer than the intrinsic relaxation time constant of the asthenosphere. It is also not rare that the sense of displacement rate is reversed during the viscoelastic relaxation. If we do not bear these points in mind, we may draw false conclusions from observed deformation data. Such complicated transient behavior can be explained mathematically from the characteristics of viscoelastic solution: for an elastic–viscoelastic layered half-space, the viscoelastic solution is expressed as superposition of three decaying components with different relaxation time constants that depend on wavelength. |
著作権等: | This is a post-peer-review, pre-copyedit version of an article published in Pure and Applied Geophysics. The final authenticated version is available online at: http://dx.doi.org/10.1007/s00024-017-1735-3. This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/237393 |
DOI(出版社版): | 10.1007/s00024-017-1735-3 |
出現コレクション: | 学術雑誌掲載論文等 |
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