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  1. 防災科研関係論文

Rupture preparation process controlled by surface roughness on meter-scale laboratory fault

https://nied-repo.bosai.go.jp/records/2828
https://nied-repo.bosai.go.jp/records/2828
62b03682-f3ee-4162-8705-8116de77ede0
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Rupture preparation process controlled by surface roughness on meter-scale laboratory fault
言語
言語 eng
著者 Futoshi Yamashita

× Futoshi Yamashita

en Futoshi Yamashita

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Eiichi Fukuyama

× Eiichi Fukuyama

en Eiichi Fukuyama

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Shiqing Xu

× Shiqing Xu

en Shiqing Xu

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Kazuo Mizoguchi

× Kazuo Mizoguchi

en Kazuo Mizoguchi

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Hironori Kawakata

× Hironori Kawakata

en Hironori Kawakata

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Shigeru Takizawa

× Shigeru Takizawa

en Shigeru Takizawa

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抄録
内容記述タイプ Other
内容記述 We investigate the effect of fault surface roughness on rupture preparation characteristics using meter-scale metagabbro specimens. We repeatedly conducted the experiments with the same pair of rock specimens to make the fault surface rough. We obtained three experimental results under the same experimental conditions (6.7 MPa of normal stress and 0.01 mm/s of loading rate) but at different roughness conditions (smooth, moderately roughened, and heavily roughened). During each experiment, we observed many stick-slip events preceded by precursory slow slip. We investigated when and where slow slip initiated by using the strain gauge data processed by the Kalman filter algorithm. The observed rupture preparation processes on the smooth fault (i.e. the first experiment among the three) showed high repeatability of the spatiotemporal distributions of slow slip initiation. Local stress measurements revealed that slow slip initiated around the region where the ratio of shear to normal stress (tau/sigma) was the highest as expected from finite element method (FEM) modeling. However, the exact location of slow slip initiation was where tau/sigma became locally minimum, probably due to the frictional heterogeneity. In the experiment on the moderately roughened fault, some irregular events were observed, though the basic characteristics of other regular events were similar to those on the smooth fault. Local stress data revealed that the spatiotemporal characteristics of slow slip initiation and the resulting tau/sigma drop for irregular events were different from those for regular ones even under similar stress conditions. On the heavily roughened fault, the location of slow slip initiation was not consistent with tau/sigma anymore because of the highly heterogeneous static friction on the fault, which also decreased the repeatability of spatiotemporal distributions of slow slip initiation. These results suggest that fault surface roughness strongly controls the rupture preparation process, and generally increases its complexity with the degree of roughness.
言語 en
書誌情報 en : Tectonophysics

巻 733, p. 193-208, 発行日 2018-05
出版者
言語 en
出版者 Elsevier BV
ISSN
収録物識別子タイプ EISSN
収録物識別子 1879-3266
DOI
関連識別子 10.1016/j.tecto.2018.01.034
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