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Evaluation of potential hazards from teletsunami in China:Tidal observations of a teletsunami generated by the Chile 8.8 M_w earthquake

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Chinese Science Bulletin 2011年第11期56卷 1108-1116页

作者： yu fujiang yuan ye zhao lianda wang peitao National Marine Environmental Forecasting Center Beijing 100081 China

At 14:34 Beijing time on February 27,2010,an earthquake of M w 8.8 rocked the central coast of Chile.A teletsunami was triggered by the huge earthquake and then propagated across the entire Pacific in less than 24 *** initial tsunami wave arrived at the southeast coast of China at 16:20 on February 28 and was recorded in real time by a number of tidal gauges off China's Mainland and Taiwan *** teletsunami waves have never been recorded with such a broad geographical scope in China before this *** aim of the present work is to report the first description of sea-level oscillations generated by the Chile tsunami,and evaluate the potential hazards that teletsunami poses to the coast of *** results reveal that the east coast of Taiwan Province,Zhejiang Province and the north coast of Fujian Province are vulnerable to transoceanic *** addition,spectral and wavelet analysis of the recorded sea-level oscillations shows that "seiches" are easily excited by the resonance resulting from the interaction between the initial tsunami waves and local geometry (such as semi-enclosed bays and ports).The superimposition of the two oscillations would amplify the wave height further.

关键词：中国大陆 8级地震潮汐观测智利评估危险东南沿海实时记录

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Observations and modelling of the travel time delay and leading negative phase of the 16 September 2015 Illapel,Chile tsunami

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Acta Oceanologica Sinica 2021年第11期40卷 11-30页

作者： peitao wang Zhiyuan Ren Lining Sun Jingming Hou Zongchen wang ye yuan fujiang yu Key Laboratory of Marine Hazards Forecasting National Marine Environmental Forecasting CenterMinistry of Natural ResourcesBeijing 100081China

The systematic discrepancies in both tsunami arrival time and leading negative phase(LNP)were identified for the recent transoceanic tsunami on 16 September 2015 in Illapel,Chile by examining the wave characteristics from the tsunami records at 21 Deep-ocean Assessment and Reporting of Tsunami(DART)sites and 29 coastal tide gauge *** results revealed systematic travel time delay of as much as 22 min(approximately 1.7%of the total travel time)relative to the simulated long waves from the 2015 Chilean *** delay discrepancy was found to increase with travel *** was difficult to identify the LNP from the near-shore observation system due to the strong background noise,but the initial negative phase feature became more obvious as the tsunami propagated away from the source area in the deep *** determined that the LNP for the Chilean tsunami had an average duration of 33 min,which was close to the dominant period of the tsunami *** of the amplitude ratios to the first elevation phase were approximately 40%,with the largest equivalent to the first positive phase *** performed numerical analyses by applying the corrected long wave model,which accounted for the effects of seawater density stratification due to compressibility,self-attraction and loading(SAL)of the earth,and wave dispersion compared with observed tsunami *** attempted to accurately calculate the arrival time and LNP,and to understand how much of a role the physical mechanism played in the discrepancies for the moderate transoceanic tsunami *** mainly focus of the study is to quantitatively evaluate the contribution of each secondary physical effect to the systematic discrepancies using the corrected shallow water *** all of these effects into consideration,our results demonstrated good agreement between the observed and simulated *** can conclude that the corrected shallow water model can reduce the tsunami propagation speed and repro

关键词： 2015 Chilean tsunami travel time delay leading negative phase numerical modeling corrected long wave earth’s elasticity loading seawater density stratification Boussinesq dispersion

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