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  1. 防災科研関係論文

A condition for super-shear rupture propagation in a heterogeneous stress field

https://nied-repo.bosai.go.jp/records/4126
https://nied-repo.bosai.go.jp/records/4126
757c1d84-6537-4bc2-a7ed-0b1567ae4e2b
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル A condition for super-shear rupture propagation in a heterogeneous stress field
言語
言語 eng
著者 E Fukuyama

× E Fukuyama

en E Fukuyama

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KB Olsen

× KB Olsen

en KB Olsen

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抄録
内容記述タイプ Other
内容記述 We have used numerical simulations with the boundary integral equation method to investigate a mechanism to excite super-shear rupture velocities in a homogeneous stress field including an asperity of increased initial stress. When the rupture, with the slip-weakening distance selected to generate sub-Rayleigh speed, encounters the asperity it either accelerates to super-shear velocities or maintains the sub-Rayleigh speed, dependent on the size and amplitude of the asperity. Three classes of rupture propagation are identified: the velocity (a) for the most narrow asperities increases slowly towards the Rayleigh wave speed, (b) for intermediate width of the asperities jumps to super-shear values for a short distance but then decreases to sub-Rayleigh wave speeds, and (c) for the widest asperities jumps to supershear values and pertains to values between the S- and P-wave velocities. The transitions between the three classes of rupture propagation are characterized by very narrow (critical) ranges of rupture resistance. If the size of the initial asperity is smaller than critical, it becomes difficult for rupture to propagate with super-shear velocities even if the initial stress level is high. Our results suggest that stress variation along the rupture path helps homogenize the rupture velocity and propagate with sub-Rayleigh wave speeds.
言語 en
書誌情報 en : PURE AND APPLIED GEOPHYSICS

巻 159, 号 9, p. 2047-2056
出版者
言語 en
出版者 BIRKHAUSER VERLAG AG
ISSN
収録物識別子タイプ ISSN
収録物識別子 0033-4553
DOI
関連識別子 10.1007/s00024-002-8722-y
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