Ocean Crustal Seismic Layer 2C

Carlson R. L.

摘要

Abstract > Normal oceanic crust is chiefly defined by a seismic structure consisting of layers 2 and 3. Houtz and Ewing (1976, href="https://doi.org/10.1029/JB081i014p02490">10.1029/JB081i014p02490</link> ) further subdivided layer 2 into layers 2A, 2B, and 2C. Though it has been associated with the dike sections sampled in Holes 504B and 1256D, layer 2C is often not observed; whether it is a distinguishable feature of the seismic structure is a question of importance to interpretations of the seismic structure and depends particularly on the defining characteristics of layers 2C and 3. A review and analysis of existing data reveal that the defining characteristic of layer 3 is a gradient of 0.1?±?0.1/s, with a velocity at the transition to layer 3 of 6.85?±?0.20?km/s. Layer 2C is observed in about half of seismic profiles examined. It can be recognized as a transition of the average velocity gradient from 1 above to 1 but more than 0.2/s below. The characteristic gradient is 0.64?±?0.22/s, and the velocity at the transition to layer 2C is 6.06?±?0.26?km/s, a value in excellent agreement with the layer 2C velocities reported by Houtz and Ewing. Model travel time curves calculated from sonic logs and seismic profiles from Sites 504 and 1256 show that layer 2C would have been observed in airgun‐sonobuoy profiles at these sites, where layer 2C is composed almost entirely of dikes, whereas layer 2B is composed chiefly of lavas. </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> > 普通的海底主要由地震结构定义，地震结构包括2和3. Houtz和ewing（1976年， href =“https://doi.org/10.1029/j081i014p02490”> 10.1029 / jb081i014p02490 </ link> ）进一步细分的第2层进入层2a，2b和2c层。尽管已经与在孔504b和1256d中采样的堤防部分相关联，但是通常未观察到层2c;是否是地震结构的可区分特征是对地震结构的解释的重要性，并且特别取决于层数2c和3的定义特征。现有数据的审查和分析表明第3层的定义特征是梯度为0.1？±0.1 / s，在过渡到6.85的速度，在6.85±3层，±0.20？Km / s。在检查的抗震型材的约一半中观察到层2c。它可以被识别为平均速度梯度的转变，从上方1中的1℃下方＆ 1但大于0.2 / s。特征梯度为0.64？±0.22 / s，并且过渡到层2c的速度为6.06？±0.26×0.26 km / s，具有Houtz和ewing报告的第2℃速度的优异协议。从站点504和1256的声波日志和地震谱计算的模型行进时间曲线表明，在这些位点的气枪 - Sonobuoy型材中，在气枪 - Sonobuoy型材中观察到层2c，其中层2c几乎完全由堤坝组成，而层2b主要由此组成熔岩。 </ 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>2018年第9期</span><b style="margin: 0 2px;">|</b><span>共13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=Carlson R. L.&option=202" target="_blank" rel="nofollow">Carlson R. L.;</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 Geology and GeophysicsTexas A&</p> <p>M UniversityCollege Station TX 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=oceanic crust&option=203" rel="nofollow">oceanic crust;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=downhole log&option=203" rel="nofollow">downhole log;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=seismic velocity&option=203" rel="nofollow">seismic velocity;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=sonic velocity&option=203" rel="nofollow">sonic velocity;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=seismic structure&option=203" rel="nofollow">seismic structure;</a> </p> <div class="translation"> 机译：海壳;井下的日志;地震速度;声速;地震结构; </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/0704023360811.html">Ocean Crustal Seismic Layer 2C</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Carlson R. 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</span> <span> . 2020-05-25</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：用于海底地震勘测的地震节点，包括地震传感器囊体和海底壳体;执行海底地震勘测的方法;以及地震节点用于实现该方法的用途 </span> </p> </li> <li> <div> <b>4. </b><a class="enjiyixqcontent" href="/patent-detail/06130401241450.html">A seismic node for an ocean bottom seismic survey comprising a seismic sensor capsule and a seafloor casing, a method for performing an ocean bottom seismic survey and the use of the seismic node for achieving the method</a> <b>[P]</b> . <span> 外国专利：  NO20180995A1 </span> <span> . 2020-01-13</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：用于海底地震勘测的地震节点，包括地震传感器囊体和海底壳体;执行海底地震勘测的方法;以及地震节点用于实现该方法的用途 </span> </p> </li> <li> <div> <b>5. </b><a class="enjiyixqcontent" href="/patent-detail/06130482881729.html">method выделени layers with reduced speed распространени seismic waves in the earth's crust</a> <b>[P]</b> . <span> 外国专利：  SU522479A1 </span> <span> . 1976-07-25</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：地壳中的地震波速度降低的方法выделени层распространени </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: 10px;display:none;" > </div> </div> </div> <div id="thesis_get_original1" class="downloadBth" style="bottom: 19px;z-index: 999;" onclick="ywcd('0704023360811','4',7,2,1,'',this,24)" class="delivery" prompt="010401" title="通过人工服务将文献原文发送至邮箱" >获取原文</div> <div 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