کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8908699 | 1636679 | 2018 | 16 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Rupture preparation process controlled by surface roughness on meter-scale laboratory fault
ترجمه فارسی عنوان
روند آماده سازی پارگی که توسط زبری سطح کنترل می شود، بر اساس خطای آزمایشگاهی در مقیاس متر است
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کلمات کلیدی
آزمایش آزمایشگاهی در مقیاس بزرگ روند آماده سازی پارگی لغزش پیشین تنش ناهمگونی، ناهمگنی اصطکاک، زبری سطح خطا،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
چکیده انگلیسی
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 (6.7â¯MPa of normal stress and 0.01â¯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 (Ï/Ï) was the highest as expected from finite element method (FEM) modeling. However, the exact location of slow slip initiation was where Ï/Ï 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 Ï/Ï 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 Ï/Ï 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tectonophysics - Volume 733, 9 May 2018, Pages 193-208
Journal: Tectonophysics - Volume 733, 9 May 2018, Pages 193-208
نویسندگان
Futoshi Yamashita, Eiichi Fukuyama, Shiqing Xu, Kazuo Mizoguchi, Hironori Kawakata, Shigeru Takizawa,