Flexural Isostasy: Constraints From Gravity and Topography Power Spectra

机译：弯曲灶具：来自重力和地形功率谱的约束

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Abstract > We have used spherical harmonic coefficients that describe Earth's gravity anomaly and topography fields to quantify the role of isostasy in contributing to crustal and upper mantle structure. Power spectra reveal that the gravity effect of topography and its flexural compensation contribute significantly to the observed free‐air gravity anomaly spectra for spherical harmonic degree 33?? <fi>n</fi> ??400, which corresponds to wavelength 100?? <fi>λ</fi> ??1200?km. The best fit is for an elastic plate (flexure) model with an elastic thickness, <fi>T</fi> <sub> <fi>e</fi> </sub> , of 34.0?±?4.0?km. Smaller values underpredict the observed gravity spectra while higher values overpredict. The best fit <fi>T</fi> <sub> <fi>e</fi> </sub> is a global average and so there will be regions where <fi>T</fi> <sub> <fi>e</fi> </sub> is lower and higher. This is confirmed in studies of selected regions such as the Hawaiian‐Emperor seamount chain and the Himalaya fold and thrust belt where we show that flexural isostatic anomalies are near zero in regions where <fi>T</fi> <sub> <fi>e</fi> </sub> ~34.0?km and of large amplitude in regions of lower and higher <fi>T</fi> <sub> <fi>e</fi> </sub> . Plate flexure may also contribute at higher ( <fi>n</fi> ??400) and lower ( <fi>n?</fi> ?33) degrees, but topography appears either uncompensated or fully compensated at these degrees, irrespective of the actual <fi>T</fi> <sub> <fi>e</fi> </sub> . All isostatic models underpredict the spectra at 2?? <fi> </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> >我们使用了描述地球的重力异常和地形字段的球形谐波系数来量化的作用在有助于地壳和上部地幔结构方面的兽间。功率谱揭示了地形的重力效应及其弯曲补偿对于球形谐波度33的观察到的自由料异常光谱有显着贡献33？< <fi> n </ fi>？＆Δ400，其对应于波长100？<1 <fi>λ</ fi>？＆？1200？km。最合适的是弹性板（弯曲）模型，弹性厚度，<fi> t </ fi> <fi> e </ fi> </ sub>，为34.0？±4.0 km。较小的值低于观察到的重力谱，而较高的值估计。最适合<fi> t </ fi> <sub> <fi> e </ fi> </ sub>是一个全局平均值，因此将有区域<fi> t </ fi> <sub> <fi > e </ fi> </ sub>较低，更高。这在夏威夷 - 皇帝海山链和喜马拉雅折叠和推力皮带等所选地区的研究中证实了这一点，其中弯曲等静压异常在</ Fi> <sub> <fi> <fi>的区域内接近零。 e </ fi> </ sub>〜34.0 km和较低的区域中的大振幅<fi> t </ fi> <sub> <fi> e </ fi> </ sub>。板弯曲也可以在更高的（<fi> n </ fi>＆α400）和更低（<fi> n =α.3）的贡献，但地形似乎是未补偿或完全补偿的这些程度，无论实际<fi> t </ fi> <sub> <fi> e </ sub>。所有等静电模型都在2℃下呈现出光谱？<1 <fi> </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-34677/'>《Journal of geophysical research. Solid earth: JGR》</a> <b style="margin: 0 2px;">|</b><span>2017年第10期</span><b style="margin: 0 2px;">|</b><span>共14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=Watts A. B.&option=202" target="_blank" rel="nofollow">Watts A. B.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Moore J. D. P.&option=202" target="_blank" rel="nofollow">Moore J. D. P.;</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 Earth SciencesUniversity of OxfordOxford UK;</p> <p>Earth Observatory of SingaporeNanyang Technological UniversitySingapore;</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=gravity&option=203" rel="nofollow">gravity;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=isostasy&option=203" rel="nofollow">isostasy;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=tectonics&option=203" rel="nofollow">tectonics;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=flexure&option=203" rel="nofollow">flexure;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=convection&option=203" rel="nofollow">convection;</a> </p> <div class="translation"> 机译：重力;雌位;构造;弯曲;对流; </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/0704020652085.html">Flexural Isostasy: Constraints From Gravity and Topography Power Spectra</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Watts A. 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