A Model for Low‐Frequency Earthquake Slip

Chestler S. R.; Creager K. C.

摘要

Abstract > Using high‐resolution relative low‐frequency earthquake (LFE) locations, we calculate the patch areas (A <sub>p</sub> ) of LFE families. During episodic tremor and slip (ETS) events, we define A <sub>T</sub> as the area that slips during LFEs and S <sub>T</sub> as the total amount of summed LFE slip. Using observed and calculated values for A <sub>P</sub> , A <sub>T</sub> , and S <sub>T</sub> , we evaluate two end‐member models for LFE slip within an LFE family patch. In the ductile matrix model, LFEs produce 100% of the observed ETS slip (S <sub>ETS</sub> ) in distinct subpatches (i.e., A <sub>T</sub> ? A <sub>P</sub> ). In the connected patch model, A <sub>T</sub> ?=?A <sub>P</sub> , but S <sub>T</sub> ? S <sub>ETS</sub> . LFEs cluster into 45 LFE families. Spatial gaps (～10 to 20 km) between LFE family clusters and smaller gaps within LFE family clusters serve as evidence that LFE slip is heterogeneous on multiple spatial scales. We find that LFE slip only accounts for ～0.2% of the slip within the slow slip zone. There are depth‐dependent trends in the characteristic (mean) moment and in the number of LFEs during both ETS events (only) and the entire ETS cycle ( <mat:math display="inline" altimg="urn:x-wiley:15252027:media:ggge21481:ggge21481-math-0001" wiley:location="equation/ggge21481-math-0001.png"> <mat:msubsup> <mat:mrow> <mat:mi mathvariant="normal">M</mat:mi> </mat:mrow> <mat:mrow> <mat:mi mathvariant="normal">c</mat:mi> </mat:mrow> <mat:mrow> <mat:mi mathvariant="normal">e</mat:mi> <mat:mi mathvariant="normal">t</mat:mi> <mat:mi mathvariant="normal">s</mat:mi> </mat:mrow> </mat:msubsup> </mat:math> and <mat:math display="inline" altimg="urn:x-wiley:15252027:media:ggge21481:ggge21481-math-0002" wiley:location="equation/ggge21481-math-0002.png"> <mat:msubsup> <mat:mrow> <mat:mi mathvariant="normal">N</mat:mi> </mat:mrow> <mat:mrow> <mat:mi mathvariant="normal">T</mat:mi> </mat:mrow> <mat:mrow> <mat:mi mathvariant="normal">e</mat:mi> <mat:mi mathvariant="normal">t</mat:mi> <mat:mi mathvariant="normal">s</mat:mi> </mat:mrow> </mat:msubsup> </mat:math> and <mat:math display="inline" altimg="urn:x-wiley:15252027:media:ggge21481:ggge21481-math-0003" wiley:location="equation/ggge21481-math-0003.png"> <mat:msubsup> <mat:mrow> <mat:mi mathvariant="normal">M</mat:mi> </mat:mrow> <mat:mrow> <mat:mi mathvariant="normal">c</mat:mi> </mat:mrow> <mat:mrow> <mat:mi mathvariant="normal">a</mat:mi> <mat:mi mathvariant="normal">l</mat:mi> <mat:mi mathvariant="normal">l</mat:mi> </mat:mrow> </mat:msubsup> </mat:math> and <mat:math display="inline" altimg="urn:x-wiley:15252027:media:ggge21481:ggge21481-math-0004" wiley:location="equation/ggge21481-math-0004.png"> <mat:msubsup> <mat:mrow> <mat:mi mathvariant="normal">N</mat:mi> </mat:mrow> <mat:mrow> <mat:mi mathvariant="normal">T</mat:mi> </mat:mrow> <mat:mrow> </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”> <标题类型=“main”>抽象</ title> > 使用高分辨率相对低频地震（LFE）位置，计算补丁区域（a <sub> p </ sub> LFE家庭的。在episodic震颤和滑动（ETS）事件中，我们定义了一个 <sub> t </ sub> 作为在LFES和S期间滑过的区域 <sub> t </ sub> 随着总结LFE滑动的总量。使用观察和计算值的a <sub> p </ sub> ，一种 <sub> t </ sub> 和S. <sub> t </ sub> ，我们为LFE系列补丁中的LFE滑移评估了两个最终成员模型。在延展性矩阵模型中，LFE产生100％观察到的ETS滑动（s <sub> ETS </ sub> ）在不同的亚斑块中（即，a <sub> t </ sub> 还一种 <sub> p </ sub> ）。在连接的补丁模型中，a <sub> t </ sub> ？=？a <sub> p </ sub> ，但是S. <sub> t </ sub> 还S. <sub> ETS </ sub> 。将群集成45个LFE家庭。 LFE家族集群之间的空间间隙（〜10至20公里），LFE家族集群中较小的差距有证据表明LFE滑动在多个空间尺度上是异质的。我们发现LFE SLIP仅占慢速区域内的〜0.2％的滑块。在ETS事件（仅限）和整个ETS周期中，有特征（平均值）时刻和LFE的数量存在深度依赖性趋势，并且在整个ETS周期中（ <mat：数学显示=“内联”Altimg =“URN：X-Wiley：15252027：媒体：GGGE21481：GGGE21481-Math-0001”Wiley：Location =“等式/ GGGE21481-Math-0001.png”> <mat：msubsup> <MAT：MROW> <mat：mi mathvariant =“正常”> m </ mat：mi> </ mat：MROW> <MAT：MROW> <mat：mi mathvariant =“正常”> c </ mat：mi> </ mat：MROW> <MAT：MROW> <mat：mi mathvariant =“正常”> e </ mat：mi> <mat：mi mathvariant =“正常”> t </ mat：mi> <mat：mi mathvariant =“正常”> s </ mat：mi> </ mat：MROW> </ mat：msubsup> </ mat：math> 和 <mat：数学显示=“内联”Altimg =“URN：X-Wiley：15252027：媒体：GGGE21481：GGGE21481-Math-0002”Wiley：Location =“等式/ GGGE21481-Math-0002.png”> <mat：msubsup> <MAT：MROW> <mat：mi mathvariant =“普通”> n </ mat：mi> </ mat：MROW> <MAT：MROW> <mat：mi mathvariant =“正常”> t </ mat：mi> </ mat：MROW> <MAT：MROW> <mat：mi mathvariant =“正常”> e </ mat：mi> <mat：mi mathvariant =“正常”> t </ mat：mi> <mat：mi mathvariant =“正常”> s </ mat：mi> </ mat：MROW> </ mat：msubsup> </ mat：math> 和 <mat：数学显示=“内联”Altimg =“URN：X-Wiley：15252027：媒体：GGGE21481：GGGE21481-Math-0003”Wiley：Location =“等式/ GGGE21481-Math-0003.png”> <mat：msubsup> <MAT：MROW> <mat：mi mathvariant =“正常”> m </ mat：mi> </ mat：MROW> <MAT：MROW> <mat：mi mathvariant =“正常”> c </ mat：mi> </ mat：MROW> <MAT：MROW> <mat：mi mathvariant =“正常”> a </ mat：mi> <mat：mi mathvariant =“正常”> l </ mat：mi> <mat：mi mathvariant =“正常”> l </ mat：mi> </ mat：MROW> </ mat：msubsup> </ mat：math> 和 <mat：数学显示=“内联”Altimg =“URN：X-Wiley：15252027：媒体：GGGE21481：GGGE21481-Math-0004”Wiley：Location =“等式/ GGGE21481-Math-0004.png”> <mat：msubsup> <MAT：MROW> <mat：mi mathvariant =“普通”> n </ mat：mi> </ mat：MROW> <MAT：MROW> <mat：mi mathvariant =“正常”> t </ mat：mi> </ mat：MROW> <MAT：MROW> </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>2017年第12期</span><b style="margin: 0 2px;">|</b><span>共19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=Chestler S. R.&option=202" target="_blank" rel="nofollow">Chestler S. R.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Creager K. C.&option=202" target="_blank" rel="nofollow">Creager K. C.;</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 and Space SciencesUniversity of WashingtonSeattle WA USA;</p> <p>Department of Earth and Space SciencesUniversity of WashingtonSeattle WA 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=slow slip&option=203" rel="nofollow">slow slip;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Cascadia&option=203" rel="nofollow">Cascadia;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=low‐frequency earthquakes&option=203" rel="nofollow">low‐frequency earthquakes;</a> </p> <div class="translation"> 机译：慢速滑动;Cascadia;低频地震; </div> </li> </ul> </div> </div> <div class="literature cardcommon"> <div class="similarity "> <h3 class="all_title" id="enpatent66">相似文献</h3> <div class="similaritytab clearfix"> <ul> <li class="active" >外文文献</li> <li >中文文献</li> <li >专利</li> </ul> </div> <div class="similarity_details"> <ul > <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/journal-foreign-detail/0704019796112.html">Imbricated slip rate processes during slow slip transients imaged by low-frequency earthquakes</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Lengline O.&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Lengline O.,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Frank W. 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href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=孙和平&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">,孙和平</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=徐建桥&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">,徐建桥</a> <span> <a href="/conference-cn-673/" target="_blank" rel="nofollow" class="tuijian_authcolor"> . 2015年中国地球科学联合学术年会 </a> <span> <span> . 2015</span> </span> </div> </li> <li> <div> <b>7. </b><a class="enjiyixqcontent" href="/academic-degree-domestic_mphd_thesis/0203151191.html">利用Yabuki & Matsu'ura反演方法研究日本东北地震和汶川地震的同震滑动模型</a> <b>[A] </b> <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=王阅兵&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor"> . 王阅兵</a> <span> . 2012</span> </span> </div> </li> </ul> <ul style="display: none;"> <li> <div> <b>1. </b><a class="enjiyixqcontent" 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