Seismic Observations Indicating That the 2015 Ogasawara (Bonin) Earthquake Ruptured Beneath the 660?km Discontinuity

Kuge Keiko

摘要

Abstract > The termination of deep earthquakes at a depth of ~700?km is a key feature for understanding the physical mechanism of deep earthquakes. The ~680?km deep 30 May 2015, Ogasawara (Bonin) earthquake ( <fi> M <sub>w</sub> </fi> ?7.9) and its aftershocks were recorded by seismic stations at distances from 7° to 19°. Synthetic seismograms indicate that the <fi>P</fi> waveforms depend on whether the earthquake is located above or below the 660?km discontinuity. In this study, I show that broadband recordings indicate that the 2015 earthquake may have occurred below the 660?km velocity discontinuity. Recordings of the <fi>P</fi> wave from the strongest aftershock lack evidence for wave triplication expected when a subhorizontal discontinuity underlies the hypocenter. Theoretical waveforms computed with a 660?km discontinuity above the aftershock and mainshock match the observed waveforms more accurately. These observations may indicate earthquake ruptures due to mantle minerals other than olivine or strong deformation of the 660?km phase transition. </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> >深度地震的终止在〜700的深度〜700？Km是理解的关键特征深海地震的物理机制。 2015年5月30日，ogasawara（波宁）地震（<fi> m <sub> w </ sub> </ fi> 3.9）及其余震在距离为7°到19 °。合成地震图表明<fi> p </ fi>波形取决于地震是否位于660 km不连续之上或低于660的不连续性。在本研究中，我表明宽带记录表明2015年地震可能发生在660 km速度不连续性以下。从最强的余震中录制<fi> p </ fi>波浪的录像缺乏当次噬细胞的不连续性下降时预期的波段的证据。在余震和主震动上方的660 km不连续性计算的理论波形和主轴更准确地匹配观察到的波形。这些观察结果可能表明由于橄榄石以外的外壳矿物或660 km相转变的强烈变形而导致地震破裂。 </ p> </ abstract> </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8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=Kuge Keiko&option=202" target="_blank" rel="nofollow">Kuge Keiko;</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 GeophysicsKyoto UniversityKyoto Japan;</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=deep earthquakes&option=203" rel="nofollow">deep earthquakes;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=the 660?km discontinuity&option=203" rel="nofollow">the 660?km discontinuity;</a> </p> <div class="translation"> 机译：深地震;660 km不连续性; 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<span>机译：在多通道观测结果中断的情况下指示强震危险变化的设备 </span> </p> </li> <li> <div> <b>5. </b><a class="enjiyixqcontent" href="/patent-detail/06130448224438.html">Earthquake protection for buildings has a layer of coarse gravel beneath building foundations with pumps for its rapid flooding with water once longitudinal pressure waves have been detected indicating imminent shear waves</a> <b>[P]</b> . <span> 外国专利：  DE19921982A1 </span> <span> . 2000-11-16</span> </div> <p class="zwjiyix translation" style="max-width: initial;height: auto;word-break: break-all;white-space: initial;text-overflow: initial;overflow: initial;"> <span>机译：建筑物的地震防护在建筑物地基下方的泵浦处有一层粗糙的砾石，一旦检测到纵向压力波表明即将来临的剪切波，便会迅速注水。 </span> </p> </li> </ul> </div> </div> </div> <div class="theme cardcommon" style="overflow: auto;display:none"> <h3 class="all_title" id="enpatent55">相关主题</h3> <ul id="subject"> </ul> </div> </div> </div> </div> <div class="right rightcon"> <div class="details_img cardcommon clearfix" style="margin-bottom: 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