Propagating tsunami wave and subsequent resonant response signals detected by HF radar in the Kii Channel, Japan
Propagating tsunami wave and subsequent resonant response signals detected by HF radar in the Kii Channel, Japan
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DOI：
10.1016/j.ecss.2011.08.009
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发表时间：
2011-11-01
影响因子：
2.8
通讯作者：
Kanatsu, Nobuyoshi
中科院分区：
文献类型：
--
作者：
Hinata, Hirofumi;Fujii, Satoshi;Kanatsu, Nobuyoshi
2011年3月11日东北冲9.0级矩震级（M-w）地震引发的海啸波和随后的共振信号被安装在纪伊海峡东海岸的高频海面雷达（HF雷达）检测为径向速度变化，距离震中沿着本州岛东海岸到南海岸约1000 km。沿着波束的带通（9-200 min）径向速度时距图显示，海啸波从大陆架陆坡向内航道传播，前三波为行波，而后激发出自然振荡;海啸波传播方向和自然振荡轴线与雷达波束方向不同。此外，在海峡和大陆架斜坡上获得的径向速度和海面高度的频谱分析表明，海啸波激发的复杂的自然振荡模式。高频雷达作为海啸探测的主要优势是早期预警，因为海啸仍然远离海岸。这一点的重要性是毋庸置疑的，此外还需要进行技术和业务研究。我们的研究结果增加了一个新的作用，高频雷达测量详细的表面电流场与高时空分辨率对了解详细的过程中的共振响应海啸波在沿海地区。(C)2011爱思唯尔有限公司版权所有。
Signals from the tsunami waves induced by the March 11, 2011 moment magnitude (M-w) 9.0 Tohoku-Oki earthquake and from subsequent resonances were detected as radial velocity variability by a high-frequency ocean surface radar (HF radar) installed on the eastern coast of the Kii Channel, at a range of about 1000 km from the epicenter along the eastern to southern coasts of Honshu Island. A time-distance diagram of band-passed (9-200 min) radial velocity along the beam reveals that the tsunami waves propagated from the continental shelf slope to the inner channel as progressive waves for the first three waves, and then natural oscillations were excited by the waves; and that the direction of the tsunami wave propagation and the axis of the natural oscillations differed from that of the radar beam. In addition, spectral analyses of the radial velocities and sea surface heights obtained in the channel and on the continental shelf slope suggest complex natural oscillation modes excited by the tsunami waves.The major advantage of the HF radars as tsunami detection is early warning as the tsunami is still far offshore. There is no doubt on this importance beside still technical and operational studies are needed. Our results adds a new role of the HF radars to measure the detailed surface current fields with high spatiotemporal resolution toward understanding detailed processes of resonant response to tsunami waves in coastal regions. (C) 2011 Elsevier Ltd. All rights reserved.