Low‐Frequency Measurements of Seismic Moduli and Attenuation in Antigorite Serpentinite

David Emmanuel C.; Brantut Nicolas; Hansen Lars N.; Jackson Ian

摘要

Abstract > Laboratory measurements of seismic moduli and attenuation in antigorite serpentinite at a confining pressure of 200?MPa and temperatures up to 550?°C provide new results relevant to the interpretation of geophysical data in subduction zones. A polycrystalline antigorite specimen was tested via forced oscillations at small strain amplitudes and seismic frequencies (millihertz to hertz). The shear modulus has a temperature sensitivity, <fi>?</fi> <fi>G</fi> / <fi>?</fi> <fi>T</fi> , averaging ?0.017?GPa/K. Increasing temperature above 500?°C results in more intensive shear attenuation ( <mat:math display="inline" altimg="urn:x-wiley:grl:media:grl58579:grl58579-math-0001" wiley:location="equation/grl58579-math-0001.png"> <mat:msubsup> <mat:mrow> <mat:mi>Q</mat:mi> </mat:mrow> <mat:mrow> <mat:mi>G</mat:mi> </mat:mrow> <mat:mrow> <mat:mo>?</mat:mo> <mat:mn>1</mat:mn> </mat:mrow> </mat:msubsup> </mat:math> ) and associated modulus dispersion, with <mat:math display="inline" altimg="urn:x-wiley:grl:media:grl58579:grl58579-math-0002" wiley:location="equation/grl58579-math-0002.png"> <mat:msubsup> <mat:mrow> <mat:mi>Q</mat:mi> </mat:mrow> <mat:mrow> <mat:mi>G</mat:mi> </mat:mrow> <mat:mrow> <mat:mo>?</mat:mo> <mat:mn>1</mat:mn> </mat:mrow> </mat:msubsup> </mat:math> increasing monotonically with increasing oscillation period and temperature. This “background” relaxation is adequately captured by a Burgers model for viscoe </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”XML：ID =“Grl58579-Abs-Abs-0001”> <标题类型=“main”>抽象</ title> >地震模子和衰减的实验室测量免疫素蛇形素在狭窄的200？MPa和温度高达550？°C的情况下提供了与俯冲区域中地球物理数据的解释相关的新结果。通过在小型应变幅度和地震频率（MilliHertz至Hertz）下的强制振荡测试多晶防脂标本。剪切模量具有温度敏感性，<Fi>φ</ fi> <fi> / <fi>α/ fi> <fi>，平均？0.017？gpa / k。提高500°C以上的温度导致更加密集的剪切衰减（<MAT：数学显示=“内联”Altimg =“URN：X-Wiley：GRL：Media：GRL58579：GRL58579-Math-0001”Wiley：Location =“等式/grl58579-math-0001.png“> <mat：msubsup> <mat：mrow> <mat：mi> q </ mat：mi> </ mat：mrow> <mat：mrow> <mat：mi> g < / MAT：MI> </ MAT：MROW> <MAT：MROW> <MAT：MO>？</ MAT：MO> <MAT：MN> 1 </ MAT：MN> </ MAT：MROW> </ MAT： msubsup> </ mat：math>）和相关的模数色散，带<mat：math显示=“内联”altimg =“urn：x-wiley：grl：media：grl58579：grl58579-math-0002”Wiley：location =“公式/ GRL58579-MATH-0002.PNG“> <MAT：MSUBSUP> <MAT：MROW> <MAT：MI> Q </ MAT：MI> </ MAT：MROW> <MAT：MROW> <MAT：MI> G. </ mat：mi> </ mat：mrow> <mat：mrow> <MAT：MO>？</ MAT：MO> <MAT：MN> 1 </ MAT：Mn> </ MAT：MROW> </ MAT：MSUBSUP> </ MAT：数学>数学在单调上增加，随着振荡周期和温度而增加。这个“背景”放松被汉堡模型充分捕获Viscoe </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-23539/'>《Geophysical Research Letters》</a> <b style="margin: 0 2px;">|</b><span>2019年第4期</span><b style="margin: 0 2px;">|</b><span>共10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=David Emmanuel C.&option=202" target="_blank" rel="nofollow">David Emmanuel C.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Brantut Nicolas&option=202" target="_blank" rel="nofollow">Brantut Nicolas;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Hansen Lars N.&option=202" target="_blank" rel="nofollow">Hansen Lars N.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Jackson Ian&option=202" target="_blank" rel="nofollow">Jackson Ian;</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 Earth SciencesUniversity College LondonLondon UK;</p> <p>Department of Earth SciencesUniversity College LondonLondon UK;</p> <p>Department of Earth SciencesUniversity of OxfordOxford UK;</p> <p>Research School of Earth SciencesAustralian National UniversityCanberra ACT Australia;</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=antigorite serpentinite&option=203" rel="nofollow">antigorite serpentinite;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=subduction zones&option=203" rel="nofollow">subduction zones;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=seismic velocity&option=203" rel="nofollow">seismic velocity;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=seismic attenuation&option=203" rel="nofollow">seismic attenuation;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=viscoelastic relaxation&option=203" rel="nofollow">viscoelastic relaxation;</a> </p> <div class="translation"> 机译：脱硫蛇型;俯冲区;地震速度;地震衰减;粘弹性松弛; 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