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Forecasting tsunamis in Poverty Bay, New Zealand, with deep-ocean gauges

机译:利用深海测量仪预测新西兰贫困湾的海啸

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摘要

The response/transfer function of a coastal site to a remote open-ocean point is introduced, with the intent to directly convert open-ocean measurements into the wave time history at the site. We show that the tsunami wave at the site can be predicted as the wave is measured in the open ocean as far as 1,000+ km away from the site, with a straightforward computation which can be performed almost instantaneously. The suggested formalism is demonstrated for the purpose of tsunami forecasting in Poverty Bay, in the Gisborne region of New Zealand. Directional sensitivity of the site response due to different conditions for the excitation of the shelf and the bay’s normal modes is investigated and used to explain tsunami observations. The suggested response function formalism is validated with available records of the 2010 Chilean tsunami at Gisborne tide gauge and at the nearby deep-ocean assessment and reporting of tsunamis (DART) station 54401. The suggested technique is also demonstrated by hindcasting the 2011 Tohoku tsunami and 2012 Haida Gwaii tsunami at Monterey Bay, CA, using an offshore record of each tsunami at DART station 46411.
机译:介绍了沿海站点到远程开放海洋点的响应/传递功能,目的是将开放海洋的测量值直接转换为该站点的波浪时间历史。我们显示,可以在现场测量到的海啸波,因为该波是在距站点1000+ km的远洋中测得的,并且可以几乎立即执行的直接计算。所建议的形式主义是为了在新西兰吉斯伯恩地区的贫困湾进行海啸预报而展示的。研究了由于激发架子和海湾的正常模式的不同条件而引起的站点响应的方向敏感性,并将其用于解释海啸观测。建议的响应函数形式主义已在Gisborne潮汐仪以及附近的深海评估和海啸(DART)站54401的可用记录中得到了2010年智利海啸的有效记录的验证。使用加利福尼亚DART站46411的每场海啸离岸记录,查看了位于加利福尼亚州蒙特雷湾的2012年Haida Gwaii海啸。

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