کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6430784 1634836 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Faults smooth gradually as a function of slip
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
Faults smooth gradually as a function of slip
چکیده انگلیسی

Geometry and roughness of fault surfaces plays a central role in the dynamics and kinematics of faulting. Faults smooth with increasing slip, but the degree of the smoothing has not previously been well-constrained for natural faults. We measure the roughness as a function of displacement for a suite of 16 faults with cumulative offsets ranging from 0.1 m to approximately 500 m. We find that slip parallel roughness evolves gradually with slip. For instance, for segments of length 0.5 m, H ≈ 2 × 10−3D−0.1 where H is the RMS roughness and D is the displacement on the fault strand with both quantities measured in meters. The gradual nature of the smoothing is robust to varying lithology and erosion. The weak function implies a decrease in the rate of gouge formation for a model with increasing slip for a model in which gouge is generated by abrading an asperity tip. The relatively gradual evolution of roughness could be explained by lubrication by the accumulated gouge that mitigates the abrasional smoothing that occurs during slip and/or re-roughening processes.

Research Highlights► Fault surfaces smooth gradually with slip - RMS Roughness ~ Slip−1/10 ► Wear of asperity tips is too gradual to generate gouge thickening linearly with slip. ► Gouge generation can decrease with offset due to lubrication and/or faults can re-roughen.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 302, Issues 1–2, 1 February 2011, Pages 185-193
نویسندگان
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