Seismic Observation of Tsunami at Island Broadband Stations

Nishida Kiwamu; Maeda Takuto; Fukao Yoshio

摘要

Abstract >Previous studies have reported seismic observations of tsunami recorded at island broadband stations. Coastal loading by the tsunami can explain them. For further quantification, we model tsunami propagation assuming an axisymmetric structure: a conical island with a flat ocean floor. The total tsunami wavefield can be represented by superposition between an incident tsunami wave and the scattering. The ground deformation due to the total tsunami wavefield at the center is calculated using static Green's functions for elastic half‐space with a first‐order correction for bathymetry. By fitting the modeled displacement to observed seismic data, we can infer the incident tsunami wave, which can be interpreted as the virtual tsunami amplitude without the conical island. First, we apply this new method to three components of seismic data at a volcano island, Aogashima, for the 2015 Torishima‐Oki tsunami earthquake. The estimated tsunami amplitude from the vertical component is consistent with the offshore array observation of absolute pressure gauges close to the island (1.5–20 mHz). The estimated incident azimuth from the three components is also consistent with ray theory. Second, we apply this method to seismic data at four island broadband stations in the Indian ocean for the 2010 Mentawai tsunami earthquake in Indonesia. Despite the limited observed frequency range from 0.5–2.0 mHz, the amplitudes and incident azimuths are consistent with past studies. These observations can complement offshore tsunami observations. Moreover, this method is applicable not only for a tsunami but also for background ocean infragravity wave activity. </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 =“JGRB53288-Abs-Abs-Abs-0001”> <标题类型=“main”>摘要</ title> >之前的研究报告了海啸的地震观察记录在岛屿宽带站。海啸沿海装载可以解释它们。为了进一步定量，我们模拟了假设轴对称结构的海啸传播：锥形岛屿，带有扁平的海底。总海啸波场可以通过入射的海啸波和散射之间的叠加来表示。由于该中心的总海啸波场引起的地面变形是使用静态绿色的函数来计算弹性半空间的函数，具有一流的碱基校正。通过拟合所建模的位移来观察地震数据，我们可以推断入射的海啸波，这可以被解释为没有锥形岛的虚拟海啸幅度。首先，我们将这种新方法应用于2015年Torishima-Oki海啸地震火山岛的火山岛地震数据的三个组成部分。来自垂直部件的估计的海啸幅度与近海阵列观察靠近岛（1.5-20MHz）的绝对压力表的观察一致。来自三个组件的估计的入射方位角也与光线理论一致。其次，我们将这种方法应用于印度海洋的四个岛屿宽带站的地震数据，为2010年印度尼西亚的芯瓦海啸地震。尽管观察到的频率范围为0.5-2.0 MHz，但幅度和入射的方位角与过去的研究一致。这些观察可以补充海上海啸观察。此外，这种方法不仅适用于海啸，还适用于背景海洋IntraGravity波浪活动。</ 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-34677/'>《Journal of geophysical research. Solid earth: JGR 》</a> <b style="margin: 0 2px;">|</b><span>2019年第2期</span><b style="margin: 0 2px;">|</b> <span>共19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=Nishida Kiwamu&option=202" target="_blank" rel="nofollow">Nishida Kiwamu;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Maeda Takuto&option=202" target="_blank" rel="nofollow">Maeda Takuto;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Fukao Yoshio&option=202" target="_blank" rel="nofollow">Fukao Yoshio;</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>Earthquake Research InstituteUniversity of TokyoBunkyo Japan;</p> <p>Hirosaki UniversityHirosaki Japan;</p> <p>Japan Agency for Marine‐Earth Science and TechnologyYokosuka Japan;</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=tsunami propagation&option=203" rel="nofollow">tsunami propagation;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=broadband seismometer&option=203" rel="nofollow">broadband seismometer;</a> </p> <div class="translation"> 机译：海啸繁殖;宽带地震表; </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/0704025591895.html">Seismic Observation of Tsunami at Island Broadband Stations</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Nishida Kiwamu&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Nishida Kiwamu,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Maeda Takuto&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Maeda Takuto,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Fukao Yoshio&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Fukao Yoshio </a> <a href="/journal-foreign-34677/" target="_blank" rel="nofollow" class="tuijian_authcolor">Journal of geophysical research. 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transmitted to ground monitoring station in real time</a> <b>[P]</b> . <span> 外国专利：  FR2938139A1 </span> <span> . 2010-05-07</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：用于观测或预报地震现象的卫星星座，例如海啸，有插入单元将测量结果实时插入给地面监测站的给定信号中 </span> </p> </li> <li> <div> <b>4. </b><a class="enjiyixqcontent" href="/patent-detail/06130403110817.html">APPARATUS AND METHOD FOR INSPECTING OBSERVATION DATA OF SEISMIC STATION USING CROSS CORRELATION</a> <b>[P]</b> . <span> 外国专利：  KR102036316B1 </span> <span> . 2019-10-25</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：利用互相关检查地震台站观测数据的装置和方法 </span> </p> </li> <li> <div> <b>5. </b><a class="enjiyixqcontent" href="/patent-detail/06130421826189.html">INDEPENDENT BOTTOM STATION FOR SEISMIC OBSERVATIONS</a> <b>[P]</b> . <span> 外国专利：  RU2438149C2 </span> <span> . 2011-12-27</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：底部独立地震台 </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('0704025591895','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 class="journalsub-pop-up" style="display: none"> <div class="journal-sub"> <h2>期刊订阅</h2> <img src="https://cdn.zhangqiaokeyan.com/img/loginclose.png" alt="关闭" 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