A Total Station Plan Combined with “D/V Chikyu” and DONET:Simultaneous Observation from Seafloor to Atmosphere
A Total Station Plan Combined with “D/V Chikyu” and DONET:Simultaneous Observation from Seafloor to Atmosphere
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结合“D/V Chikyu”和DONET的全站仪方案：从海底到大气的同步观测
DOI：
10.1109/oceanskobe.2018.8559382
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Ichikawa Kaoru
中科院分区：
文献类型：
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作者：
Ariyoshi Keisuke;Nishida Shuhei;Machida Yuya;Iinuma Takeshi;Uchida Hiroshi;Nagano Akira;Hasegawa Takuya;Miyama Toru;Miyazawa Yasumasa;Wakita Masahide;Kuwatani Tatsu;Aoike Kan;Fujita Mikiko;Kuwano-Yoshida Akira;To Akiko;Ichikawa Kaoru
受2004年苏门答腊-安达曼地震的影响，在南开海槽周围开发和安装了DONET(致密海底地震和海啸网络系统)。DONet包括压力计和地震仪，预计将探测由剥离俯冲板块耦合过程驱动的地壳变形。从我们的模拟结果来看，即使在同一科学节点，水准变化在Donet点之间也是不同的。另一方面，由于全球变暖导致的冰块融化等海洋波动的规模很大，使得所有DONET点的海底压力都发生了一致的变化，特别是在同一节点。这一差异表明了通过叠加数据的差值从海底压力数据中提取地壳形变分量的可能性。然而，这一操作不能应用于与海洋中尺度涡旋和海流波动有关的局部尺度波动，后者通过水柱(从海面到海底)中水密度的变化来影响海底压力。最近，黑潮的水流路径发生了巨大的变化，对多尼站的海底压力产生了显著的影响。因此，我们需要将地震学、海洋物理学和海啸工程相结合进行综合分析，将其分解为地壳形变、海洋波动和仪器漂移，从而产生足够高精度的数据来发现地球物理现象。由于DONet已经并将利用深海钻探船Chikyu连接到在综合大洋钻探计划(IODP)下在南开海槽建造的长期钻孔观测站，我们必须利用这个机会讨论从海底到大气同步观测的最佳方式。
DONET (Dense Oceanfloor Network system for Earthquakes and Tsunamis) has been developed and installed around Nankai Trough, which is motivated by the 2004 Sumatra-Andaman Earthquake. DONET contains pressure gauges as well as seismometers, which is expected to detect crustal deformations driven by peeling off subduction plate coupling process. From our simulation results, leveling changes are different sense among at the DONET points even in the same science node. On the other hand, oceanic fluctuations such as melting ice masses through the global warming has so large scale as to cause ocean bottom pressure change coherently for all of DONET points especially in the same node. This difference suggests the possibility of extracting crustal deformations component from ocean bottom pressure data by differential of stacking data. However, this operation cannot be applied to local-scale fluctuations related to ocean mesoscale eddies and current fluctuations, which affect ocean bottom pressure through water density changes in the water column (from the sea surface to the bottom). Recently, Kuroshio current path has been changed drastically, which significantly affect ocean bottom pressures at DONET station points. Therefore, we need integral analysis by combining seismology, ocean physics and tsunami engineering so as to decompose into crustal deformation, oceanic fluctuations and instrumental drift, which will bring about high precision data enough to find geophysical phenomena. Since DONET has been and will be connected to long-term borehole observatories constructed in the Nankai Trough under the Integrated Ocean Drilling Program (IODP) by using the deep-sea drilling vessel Chikyu, we have to discuss the best way to do simultaneous observation from seafloor to atmosphere by taking advantage of this chance.