The sediment‐fill of Pago Pago Bay (Tutuila Island, American Samoa): New insights on the sediment record of past tsunamis

摘要

Abstract > Extensive bathymetric and two‐dimensional seismic surveys have been carried out and cores collected in Pago Pago Bay (Tutuila, American Samoa) in order to describe and gain a better understanding of the sediment fill of the bay, which was affected by the 2009 South Pacific Tsunami. Eight sedimentary units were identified over the volcanic bedrock. The basal transgressive unit displays retrograding onlaps towards the shore, whereas the overlying seven aggradational layers alternate between four draping units and three pinching out seaward units. ‘Core to seismic’ correlation reveals that draping units are composed of homogeneous silts, while pinching out units are dominated by very coarse coral fragments showing fresh cuts, mixed with Halimeda plates. The basal unit is attributed to transgressive sedimentation in response to flooding of the bay after the last glacial maximum, followed by the upper aggradational units corresponding to highstand sedimentation. The changeovers in these upper units indicate an alternation between low‐energy silt units and high‐energy coral debris units interpreted as tsunami‐induced deposits. The 14 C dating reveals that high‐energy sedimentation units can last up to approximately 2000?years while low‐energy sedimentation units can last up to approximately 1000?years. This alternation, deposited during the last highstand, may be explained by cycles of tectonic activity and quiescence of the Tonga Trench subduction, which is the main source of tsunamigenic earthquakes impacting the Samoan archipelago. In the uppermost silt unit, only the geochemical signature of the terrestrial input of the 2009 <fc>SPT</fc> backwash deposits was detected between 7?cm and 9?cm depth. Hence, Pago Pago Bay offers a unique sediment record of Holocene bay‐fill under the impact of past tsunamis intermittently during the last 7000?years. </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：ID =“SED12574-ABS-ABS-0001”XML：LANG =“EN”> <标题类型=“main”>抽象</ title> > 已经进行了广泛的沐浴和二维地震调查，并在Pago Pago Bay（Tutuila，American Samoa）中收集了核心，以便更好地了解海湾的沉积物填充，受2009年南太平洋影响海啸。在火山岩基岩上鉴定了八个沉积单元。基底近越近迁移单元朝向岸上的逆行，而覆盖的七个聚合层在四个悬垂单元之间交替，并且三个夹出海上单位。 “核心地震”相关性揭示了悬垂的单元由均匀的淤泥组成，而捏出单位是由非常粗糙的珊瑚碎片主导，显示出新鲜切割，混合 Halimeda </ i> 板块。基本单位归因于响应于最后冰川最大值之后的海湾的洪水泛滥的沉淀，其次是对应于高处理沉降的上部聚合单位。这些上部单元中的转换表示低能量淤泥单元与解释为海啸诱导的沉积物的高能量珊瑚碎片单元之间的交替。这 14 </ sup> C约会揭示了高能沉降装置持续高达约2000年的时间，而低能量沉降单位可以持续高达约1000岁。在上一个高级支架期间沉积的这种交替可以通过汤加沟槽俯冲的构造活动和静态的循环来解释，这是影响萨摩亚群岛的海啸地震的主要来源。在最上面的淤泥单元中，只有2009年陆地投入的地球化学签名 <FC> SPT </ FC> 在7Ωcm和9？cm深度之间检测到反洗沉积物。因此，Pago Pago Bay提供全新世湾的独特沉积物记录 - 在过去7000年期间间歇性地填补了过去海啸的影响。 </ 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-28547/'>《Sedimentology: Journal of the International Association of Sedimentologists》</a> <b style="margin: 0 2px;">|</b><span>2020年第3期</span><b style="margin: 0 2px;">|</b><span>共24页</span> </div> </li> <li> <div class="author"> <span class="lefttit">作者</span> <p id="fAuthorthree" class="threelineshidden zhankaihshouqi"> </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"> </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/165.html" title="地质学">地质学;</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=Core to seismic correlation&option=203" rel="nofollow">Core to seismic correlation;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Holocene&option=203" rel="nofollow">Holocene;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=sediment bay‐fill&option=203" rel="nofollow">sediment bay‐fill;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=shallow marine tsunami deposits&option=203" rel="nofollow">shallow marine tsunami deposits;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=tectonic activity cycles&option=203" rel="nofollow">tectonic activity cycles;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=tsunami&option=203" rel="nofollow">tsunami;</a> </p> <div class="translation"> 机译：地震相关性;全新世;沉积物湾填充;浅海海啸矿床;构造活动周期;海啸; 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rel="nofollow" class="tuijian_auth tuijian_authcolor">,王红亚</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=程颖&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">,程颖</a> <span> <a href="/journal-cn-50330/" target="_blank" rel="nofollow" class="tuijian_authcolor"> . 北京大学学报：自然科学版 </a> </span> <span> . 2018</span><span>,第1期</span> </span> </div> </li> </ul> <ul style="display: none;"> <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/patent-detail/06130416513222.html">Method for restoration of undergrowth in sediment or aquatic soil, involves creating suspension of sediment or aquatic soil including diaspora bank, and awaiting re-sedimentation of suspension in fluid filled space</a> <b>[P]</b> . <span> 外国专利：  DE102012112032B3 </span> <span> . 2014-04-03</span> </div> <p class="zwjiyix translation" style="max-width: initial;height: auto;word-break: break-all;white-space: initial;text-overflow: initial;overflow: initial;"> 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