Evidence for Mass Transport Deposits at the IODP JFAST-Site in the Japan Trench
Evidence for Mass Transport Deposits at the IODP JFAST-Site in the Japan Trench
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日本海沟 IODP JFAST 站点的大众运输沉积物的证据
DOI：
10.1007/978-3-319-00972-8_4
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
V Sonne Cruise SO219A Cruise Participants
中科院分区：
文献类型：
--
作者：
Strasser;Römer;Kölling;Ikehara;Kanamatsu;Dinten;Fujiwara;Kawamura;Kodaira;V Sonne Cruise SO219A Cruise Participants
几项研究表明，2011年日本太平洋沿岸的东北- oki地震（Mw9.0）引发了日本海沟的滑动并引发了日本海沟的山体滑坡。为了更好地了解这些过程，在海沟进行了详细的测绘和浅层取心滑坡，并进行了综合海洋钻探计划（IODP）深层钻探以恢复板块边界（日本海沟快速地震钻探项目，JFAST）。在这项研究中，我们报告了从快速响应的SONNEcruise （SO219A）到日本海沟的沉积物岩心数据，证明了后来在IODP第343次探险期间在jfast站点钻探的最上层段存在物质搬运沉积（MTD）。一个8.7 m长的重力岩心（GeoB16423-1）从约7000 m的水深中恢复，揭示了8 m的半固结泥屑角砾岩序列嵌入扭曲的混沌沉积物基质中。MTD被一层50厘米的半深海生物扰动硅藻泥薄层覆盖。该地层边界可以通过多传感器岩心测井和降锥穿透仪抗剪强度测量的物性数据清晰地区分出来。孔隙水的地球化学分析显示了从海底下核开始测量的未受干扰的线性剖面，跨越了上覆的年轻背景沉积物和下面的MTD之间的地层接触。这表明所研究的剖面没有受到最近东北-冲大地震过程中沉积物失稳的影响。相反，我们报告了发生在700到1万年前的更古老的滑坡，这意味着海底物质运动是沿日本海沟的主导过程。然而，它们发生在局部地点，而不是每次大逆冲地震期间。
Several studies indicate that the 2011 Tohoku-Oki earthquake (Mw9.0) off the Pacific coast of Japan has induced slip to the trench and triggered landslides in the Japan Trench. In order to better understand these processes, detailed mapping and shallow-coring landslides at the trench as well as Integrated Ocean Drilling Program (IODP) deep drilling to recover the plate boundary décollement (Japan Trench Fast Earthquake Drilling Project, JFAST) have been conducted. In this study we report sediment core data from the rapid responseR/V SONNEcruise (SO219A) to the Japan Trench, evidencing a Mass Transport Deposit (MTD) in the uppermost section later drilled at this JFAST-site during IODP Expedition 343. A 8.7 m long gravity core (GeoB16423-1) recovered from ∼7,000 m water depth reveals a 8 m sequence of semi-consolidated mud clast breccias embedded in a distorted chaotic sediment matrix. The MTD is covered by a thin veneer of 50 cm hemipelagic, bioturbated diatomaceous mud. This stratigraphic boundary can be clearly distinguished by using physical properties data from Multi Sensor Core Logging and from fall-cone penetrometer shear strength measurements. The geochemical analysis of the pore-water shows undisturbed linear profiles measured from the seafloor downcore across the stratigraphic contact between overlying younger background-sediment and MTD below. This indicates that the investigated section has not been affected by a recent sediment destabilization in the course of the giant Tohoku-Oki earthquake event. Instead, we report an older landslide which occurred between 700 and 10,000 years ago, implying that submarine mass movements are dominant processes along the Japan Trench. However, they occur on local sites and not during each megathrust earthquake.
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影响因子：
5.2
作者：
Mori, Nobuhito;Takahashi, Tomoyuki;Yanagisawa, Hideaki
通讯作者：
Yanagisawa, Hideaki
影响因子：
3
作者：
Fujii, Yushiro;Satake, Kenji;Kanazawa, Toshihiko
通讯作者：
Kanazawa, Toshihiko
日本白垩纪至全新世弧前演化及其对地壳动力学的意义
影响因子：
3.1
作者：
A. Taira;Y. Ogawa
通讯作者：
Y. Ogawa
近海地震和/或海啸引起的沉积物输送及其沉积：海洋沉积物研究对于了解过去地震和海啸的重要性
DOI：
10.4096/jssj.71.141
发表时间：
2012
期刊：
Journal of The Sedimentological Society of Japan
影响因子：
--
作者：
K. Ikehara
通讯作者：
K. Ikehara