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Thermal Weakening of Asperity Tips on Fault Planes at High Sliding Velocities

机译:高滑动速度故障平面粗糙度的热弱化

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Abstract > Real contacts on the scale of ~10?μm support gigapascal shear tractions and normal tractions on rapidly sliding faults. At sliding velocities above ~0.1?m/s, the asperity tips of the contacts become hot and weak. The macroscopic friction depends on the average strength of the asperity tips during their lifetimes of contact. The strength of the asperity tips does not go essentially to zero once they become weak because frictional heating would then cease and the tips would cool and strengthen. Rather, the contact retains finite strength so that frictional heating balances the heat lost from the asperity tip by conduction. Crudely, the macroscopic coefficient of friction at high sliding velocities decreases with the inverse of the square root of velocity rather than the inverse of the velocity in the widely used model of Rice (2006, <url href="https://doi.org/10.1029/2005/JB004006">https://doi.org/10.1029/2005/JB004006</url> ). Numerical thermal‐mechanical models support this inference. The finite strength of the asperity tips retards lateral extrusion of weakened material from the tips. Otherwise, extrusion would allow the sliding surfaces to converge establishing new contacts, which would renew the strength of the surface. The macroscopic coefficient of friction with somewhat weakened asperity tips remains high enough that the fault surface becomes hot on a millimeter scale in large crustal earthquakes. Fluid pressurization and eventually millimeter‐scale melting then reduce the macroscopic shear traction to lower values than does asperity tip weakening acting alone. </abstract> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> <div class="translation abstracttxt"> <span class="zhankaihshouqi fivelineshidden" id="abstract"> <span>机译:</span><Abstract Type =“Main”XML:Lang =“en”> <标题类型=“main”>抽象</ title> > 真正的触点在〜10?μm的等级上,载体缩窄剪切牵引力和正常诉讼在快速滑动断层上。在高于〜0.1Ωm/ s的滑动速度下,触点的粗糙尖端变得热且薄弱。宏观摩擦取决于在其寿命的接触期间的粗糙尖端的平均强度。一旦它们变弱,由于摩擦加热,速度尖端的强度并没有基本上为零,因为摩擦加热将停止,并且尖端会凉爽且加强。相反,接触保持有限强度,使得摩擦加热通过传导来平衡从粗糙尖端损失的热量。粗略地,在高滑动速度下的宏观摩擦系数随着速度的平方根而不是广泛使用的大米模型中的速度倒数(2006, <url href =“https://doi.org/10.1029/2005/j004006”> https://doi.org/10.1029/2005/jb004006 </ URL> )。数值热机械模型支持此推断。粗糙度尖端的有限强度延迟了尖端的横向挤出。否则,挤出将允许滑动表面收敛建立新的触点,这将更新表面的强度。具有稍微弱化尖端的宏观摩擦系数仍然足够高,使得故障表面变热,在大型地壳地震中的毫米尺度上变热。流体加压和最终毫米级熔化,然后将宏观剪切牵引力降低到较低的值,而不是单独的粗糙尖端削弱作用。 </ p> </摘要> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> </div> <div class="record"> <h2 class="all_title" id="enpatent33" >著录项</h2> <ul> <li> <span class="lefttit">来源</span> <div style="width: 86%;vertical-align: text-top;display: inline-block;"> <a href='/journal-foreign-23285/'>《Geochemistry, geophysics, geosystems》</a> <b style="margin: 0 2px;">|</b><span>2019年第2期</span><b style="margin: 0 2px;">|</b><span>共25页</span> </div> </li> <li> <div class="author"> <span class="lefttit">作者</span> <p id="fAuthorthree" class="threelineshidden zhankaihshouqi"> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Sleep Norman H.&option=202" target="_blank" rel="nofollow">Sleep Norman H.;</a> </p> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zkzz" style="display: none;">展开▼</span> </div> </li> <li> <div style="display: flex;"> <span class="lefttit">作者单位</span> <div style="position: relative;margin-left: 3px;max-width: 639px;"> <div class="threelineshidden zhankaihshouqi" id="fOrgthree"> <p>Department of GeophysicsStanford UniversityStanford CA USA;</p> </div> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zhdw" style="display: none;">展开▼</span> </div> </div> </li> <li > <span class="lefttit">收录信息</span> <span style="width: 86%;vertical-align: text-top;display: inline-block;"></span> </li> <li> <span class="lefttit">原文格式</span> <span>PDF</span> </li> <li> <span class="lefttit">正文语种</span> <span>eng</span> </li> <li> <span class="lefttit">中图分类</span> <span><a href="https://www.zhangqiaokeyan.com/clc/163.html" title="地球物理学">地球物理学;</a></span> </li> <li class="antistop"> <span class="lefttit">关键词</span> <p style="width: 86%;vertical-align: text-top;"> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=dynamic weakening of faults&option=203" rel="nofollow">dynamic weakening of faults;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=thermal pressurization&option=203" rel="nofollow">thermal pressurization;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=flash heating&option=203" rel="nofollow">flash heating;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=heat flow paradox&option=203" rel="nofollow">heat flow paradox;</a> </p> <div class="translation"> 机译:断层动态弱化;热加压;闪蒸加热;热流悖论; 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