Constraints on Inner Core Anisotropy Using Array Observations of P′P′

Frost Daniel A.; Romanowicz Barbara

摘要

Abstract >Recent studies of PKPdf travel times suggest strong anisotropy (4% or more) in the quasi‐western inner core hemisphere. However, the availability of paths sampling at low angles to the Earth's rotation axis (the fast axis) is limited. To augment this sampling, we collected a travel time data set for the phase P′P′df (PKPPKPdf), for which at least one inner core leg is quasi‐polar, at two high latitude seismic arrays. We find that the inferred anisotropy is weak (on the order of 0.5 to 1.5%), confirming previous results based on a much smaller P′P′ data set. While previous models of inner core anisotropy required very strong alignment of anisotropic iron grains, our results are more easily explained by current dynamic models of inner core growth. We observe large travel time anomalies when one leg of P′P′df is along the South Sandwich to Alaska path, consistent with PKPdf observations, and warranting further investigation. </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> > PKPDF旅行时间的最新研究表明，在准则中提出了强大的各向异性（4％或更多）西部内核半球。然而，以低角度向地球旋转轴（快速轴）以低角度采样的路径的可用性受到限制。为了增强这种采样，我们收集了相位p'p'df（pkppkpdf）的旅行时间数据集，其中至少一个内核腿是准偏光的两个高纬度地震阵列。我们发现推断的各向异性弱（大约0.5到1.5％），基于更小的P'p的数据集确认先前的结果。虽然先前的内核各向异性模型需要极强的各向异性铁颗粒对准，但我们的结果更容易通过内核核心生长的动态模型来解释。当P'P'DF的一条腿沿着南三明治到阿拉斯加路径，与PKPDF观测结果一致，并保证进一步调查时，我们观察大型旅行时间异常。</ 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9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=Frost Daniel A.&option=202" target="_blank" rel="nofollow">Frost Daniel A.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Romanowicz Barbara&option=202" target="_blank" rel="nofollow">Romanowicz Barbara;</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>Earth and Planetary ScienceUniversity of CaliforniaBerkeley CA USA;</p> <p>Earth and Planetary ScienceUniversity of CaliforniaBerkeley 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=inner core&option=203" rel="nofollow">inner core;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=body waves&option=203" rel="nofollow">body waves;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=PKP&option=203" rel="nofollow">PKP;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=anisotropy&option=203" rel="nofollow">anisotropy;</a> </p> <div class="translation"> 机译：内核;身体波;PKP;各向异性; </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/0704019850257.html">Constraints on Inner Core Anisotropy Using Array Observations of P′P′</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Frost Daniel A.&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Frost Daniel A.,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Romanowicz Barbara&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Romanowicz Barbara </a> <a href="/journal-foreign-23539/" target="_blank" rel="nofollow" class="tuijian_authcolor">Geophysical Research Letters .</a> <span>2017</span><span>,第21期</span> </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：使用P'p的阵列观察的内核各向异性对内核各向异性的约束</span> </p> </li> <li> <div> <b>2. </b><a class="enjiyixqcontent" href="/academic-journal-foreign_detail_thesis/0204121309267.html">Galactic cold cores - VII. 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