Modeling Low‐Frequency Earthquake Recurrence Patterns

Wu Chunquan; Daub Eric G.

摘要

Abstract >Tectonic tremor and low‐frequency earthquakes (LFE) have been identified globally, but the physical mechanisms responsible for different types of LFE recurrence patterns are still elusive. Here we use a brittle ductile friction model to study the frictional conditions leading to different LFE recurrence patterns observed in central California. We do a comprehensive search of the friction parameters, including the brittle contact failure length and ductile damping strength to generate synthetic LFE bursts that match three different occurrence patterns of LFE bursts. We find that the output synthetic LFE burst recurrence type varies under different frictional conditions. The chaotic recurrence LFE sources require a higher brittle‐to‐ductile friction ratio, consistent with the observation that they are mainly at shallower part of the brittle‐ductile transition zone. The trimodal recurrence LFE sources require a wide distribution of asperity sizes, indicating that the segment of deep San Andreas Fault between Monarch Peak and Parkfield is likely to be more fragmented and weaker than the surrounding segments. </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> >构造震颤和低频地震（LFE）已被全局识别，但物理机制对不同类型的LFE复发模式负责仍然难以捉摸。在这里，我们使用脆性延展模型来研究导致在加利福尼亚州中部观察到不同的LFE复发模式的摩擦条件。我们全面搜索摩擦参数，包括脆性接触失效长度和延展性阻尼强度，以产生与匹配的LFE突发的三种不同的发生模式匹配的合成LFE突发。我们发现输出合成LFE突发复发型在不同的摩擦条件下变化。混沌复发LFE源需要更高的脆性摩擦摩擦率，与观察结果一致，即它们主要处于脆性延性过渡区的浅一部分。 Trimodal复发LFE源需要广泛的粗糙尺寸分布，表明帝王峰和Parkfield之间的Sand San Andreas故障的段可能比周围的段更碎片化和弱。</ 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-23539/'>《Geophysical Research Letters》</a> <b style="margin: 0 2px;">|</b><span>2017年第21期</span><b style="margin: 0 2px;">|</b><span>共7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=Wu Chunquan&option=202" target="_blank" rel="nofollow">Wu Chunquan;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Daub Eric G.&option=202" target="_blank" rel="nofollow">Daub Eric G.;</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>Center for Earthquake Research and InformationUniversity of MemphisMemphis TN USA;</p> <p>Center for Earthquake Research and InformationUniversity of MemphisMemphis TN 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=tectonic tremor&option=203" rel="nofollow">tectonic tremor;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=low‐frequency earthquake&option=203" rel="nofollow">low‐frequency earthquake;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=central California&option=203" rel="nofollow">central California;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Parkfield&option=203" rel="nofollow">Parkfield;</a> </p> <div class="translation"> 机译：构造震颤;低频地震;中央加利福尼亚州;Parkfield; 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