Imaging a Crustal Low‐Velocity Layer Using Reflected Seismic Waves From the 2014 Earthquake Swarm at Long Valley Caldera, California: The Magmatic System Roof?

Nakata Nori; Shelly David R.

摘要

Abstract > The waveforms generated by the 2014 Long Valley Caldera earthquake swarm recorded at station MLH show clear reflected waves that are often stronger than direct P and S waves. With waveform analyses, we discover that these waves are reflected at the top of a low‐velocity body, which may be residual magma from the ～767?ka caldera‐forming eruption. The polarity of the reflection compared to direct P and S waves suggests that the reflection is S P waves ( S from hypocenters to reflector and then convert to P waves to the surface). Because the wavefields are coherent among different earthquakes and hold high signal‐to‐noise ratios, we apply them to a wavefield migration method for imaging reflectors. The depth of the imaged magmatic system roof is around 8.2?km below the surface. This is consistent with previous studies. Even though we use only one station and waveforms from one earthquake swarm, the dense cluster of accurately located earthquakes provides a high‐resolution image of the roof. </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”XML：ID =“Grl57190-Abs-abs-0001”> <标题类型=“main”>抽象</ title> > 2014长谷生成的波形卡尔德拉地震群在电台MLH中记录的透明反射波通常比直接效应更强大 P </ i>和 s </ i>波浪。利用波形分析，我们发现这些波在低速体的顶部反射，这可能是来自〜767的剩余岩浆？Ka Caldera成型喷发。反射与直接 p </ i>和 s </ i>波的极性表明反射是 p </ i>波（< i> S从低速缩进到反射器，然后转换为 p </ i>波到表面）。因为波场在不同地震中相干并保持高信噪比，所以我们将它们应用于用于成像反射器的波场迁移方法。成像岩浆系统屋顶的深度在表面以下约为8.2克。这与以前的研究一致。尽管我们仅使用一个地震群中的一个站点和波形，但是精确位于地震的密集集群提供了屋顶的高分辨率图像。 </ 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>2018年第8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=Nakata Nori&option=202" target="_blank" rel="nofollow">Nakata Nori;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Shelly David R.&option=202" target="_blank" rel="nofollow">Shelly David R.;</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>ConocoPhillips School of Geology and Geophysics University of OklahomaNorman OK USA;</p> <p>U.S. Geological SurveyMenlo Park 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=Long Valley&option=203" rel="nofollow">Long Valley;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=seismic reflection&option=203" rel="nofollow">seismic reflection;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=earthquake swarm&option=203" rel="nofollow">earthquake swarm;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=seismic imaging&option=203" rel="nofollow">seismic imaging;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=magmatic roof&option=203" rel="nofollow">magmatic roof;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=volcano&option=203" rel="nofollow">volcano;</a> </p> <div class="translation"> 机译：长山谷;地震反射;地震群;地震成像;岩浆屋顶;火山; 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