کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6428174 1634727 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Thermo-mechanical pressurization of experimental faults in cohesive rocks during seismic slip
ترجمه فارسی عنوان
فشرده سازی حرارتی مکانیکی گسل های تجربی در سنگ های یکپارچه در طی لغزش لرزه ای
کلمات کلیدی
اصطکاک، زمین لرزه، مایعات فشار فشاری حرارتی مکانیکی، بازالت، سنگ مرمر،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
چکیده انگلیسی


- High velocity friction experiments on cohesive rocks under undrained conditions.
- Experimental evidence of thermo-mechanical pressurization (TMP).
- TMP weakening of cohesive rocks is negligible during earthquakes.

Earthquakes occur because fault friction weakens with increasing slip and slip rates. Since the slipping zones of faults are often fluid-saturated, thermo-mechanical pressurization of pore fluids has been invoked as a mechanism responsible for frictional dynamic weakening, but experimental evidence is lacking. We performed friction experiments (normal stress 25 MPa, maximal slip-rate ∼3 ms−1) on cohesive basalt and marble under (1) room-humidity and (2) immersed in liquid water (drained and undrained) conditions. In both rock types and independently of the presence of fluids, up to 80% of frictional weakening was measured in the first 5 cm of slip. Modest pressurization-related weakening appears only at later stages of slip. Thermo-mechanical pressurization weakening of cohesive rocks can be negligible during earthquakes due to the triggering of more efficient fault lubrication mechanisms (flash heating, frictional melting, etc.).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 429, 1 November 2015, Pages 1-10
نویسندگان
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