Upper Mantle Earth Structure in Africa From Full‐Wave Ambient Noise Tomography

机译：来自全波环境噪声断层扫描的非洲上部地幔地球结构

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Abstract >Our understanding of the tectonic development of the African continent and the interplay between its geological provinces is hindered by unevenly distributed seismic instrumentation. In order to better understand the continent, we used long‐period ambient noise full‐waveform tomography on data collected from 186 broadband seismic stations throughout Africa and surrounding regions to better image the upper mantle structure. We extracted empirical Green's functions from ambient seismic noise using a frequency‐time normalization method and retrieved coherent signal at periods of 7–340?s. We simulated wave propagation through a heterogeneous Earth using a spherical finite‐difference approach to obtain synthetic waveforms, measured the misfit as phase delay between the data and synthetics, calculated numerical sensitivity kernels using the scattering integral approach, and iteratively inverted for structure. The resulting images of isotropic, shear wave speed for the continent reveal segmented, low‐velocity upper mantle beneath the highly magmatic northern and eastern sections of the East African Rift System (EARS). In the southern and western sections, high‐velocity upper mantle dominates, and distinct, low‐velocity anomalies are restricted to regions of current volcanism. At deeper depths, the southern and western EARS transition to low velocities. In addition to the EARS, several low‐velocity anomalies are scattered through the shallow upper mantle beneath Angola and North Africa, and some of these low‐velocity anomalies may be connected to a deeper feature. Distinct upper mantle high‐velocity anomalies are imaged throughout the continent and suggest multiple cratonic roots within the Congo region and possible cratonic roots within the Sahara Metacraton. </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> <P>我们对非洲大陆的构造发展以及地质省份之间的相互作用受到不均匀分布的地震仪器的影响。为了更好地理解大陆，我们使用了从非洲和周围地区的186个宽带地震站收集的数据的长期环境噪声全波形断层扫描，以更好地映像上部地幔结构。我们使用频率 - 时间归一化方法从环境地震噪声中提取了经验绿色的功能，并在7-340秒的时间内检索相干信号。我们使用球形有限差异方法模拟通过异构地球的波传播，以获得合成波形，以数据和合成器之间的相位延迟测量错位，使用散射积分方法计算数值灵敏度核，迭代反转以进行结构。由此产生的各向同性，剪力波速的图像，为东非裂谷系统（耳朵）高度岩浆北部和东部的侧岩和东部的分段，低速上部地幔。在南部和西部的部分中，高速上部地幔占主导地位，不同的低速异常，仅限于当前火山的区域。深入深入，南方和西部的耳朵过渡到低速。除了耳朵之外，几个低速异常散落在安哥拉和北非下方的浅层地幔中，这些低速异常中的一些可以连接到更深的特征。在整个大陆上仿造了不同的上部地幔高速异常，并在刚果区域内提出多个裂隙根，并且在撒哈拉甲段内的可能的匍匐根。</ 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-23285/'>《Geochemistry, geophysics, geosystems》</a> <b style="margin: 0 2px;">|</b><span>2019年第1期</span><b style="margin: 0 2px;">|</b><span>共28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=Emry E. L.&option=202" target="_blank" rel="nofollow">Emry E. L.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Shen Y.&option=202" target="_blank" rel="nofollow">Shen Y.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Nyblade A. A.&option=202" target="_blank" rel="nofollow">Nyblade A. A.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Flinders A.&option=202" target="_blank" rel="nofollow">Flinders A.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Bao X.&option=202" target="_blank" rel="nofollow">Bao X.;</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 GeosciencesPennsylvania State UniversityUniversity Park PA USA;</p> <p>Graduate School of OceanographyUniversity of Rhode IslandNarragansett RI USA;</p> <p>Department of GeosciencesPennsylvania State UniversityUniversity Park PA USA;</p> <p>Graduate School of OceanographyUniversity of Rhode IslandNarragansett RI USA;</p> <p>Graduate School of OceanographyUniversity of Rhode IslandNarragansett RI 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=Africa&option=203" rel="nofollow">Africa;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=rifting&option=203" rel="nofollow">rifting;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=craton&option=203" rel="nofollow">craton;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=ambient noise&option=203" rel="nofollow">ambient noise;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=full‐waveform&option=203" rel="nofollow">full‐waveform;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=upper mantle&option=203" rel="nofollow">upper mantle;</a> </p> <div class="translation"> 机译：非洲;徘徊;克拉顿;环境噪声;全波形;上部地幔; </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/0704023360493.html">Upper Mantle Earth Structure in Africa From Full‐Wave Ambient Noise Tomography</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Emry E. 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