Advanced Tsunami Numerical Simulations and Energy Considerations by use of 3D-D Coupled Models: The October 11, 1918, Mona Passage Tsunami

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• 作者：Alberto M. López-Venegas ; Juan Horrillo…
• 关键词：1918 Mona ; tsunami ; submarine landslide ; volume of fluid ; three ; dimensional model ; non ; hydrostatic model ; tsunami energy
• 刊名：Pure and Applied Geophysics
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：172
• 期：6
• 页码：1679-1698
• 全文大小：6,135 KB
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• 作者单位：Alberto M. López-Venegas (1)
  Juan Horrillo (2)
  Alyssa Pampell-Manis (2)
  Victor Huérfano (1)
  Aurelio Mercado (3)
  
  1. Puerto Rico Seismic Network, Department of Geology, University of Puerto Rico, Mayagüez Campus, Mayagüez, PR, USA
  2. Texas A&M University at Galveston, Galveston, TX, USA
  3. Department of Marine Sciences, University of Puerto Rico, Mayagüez Campus, Mayagüez, PR, USA
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  
• 出版者：Birkh盲user Basel
• ISSN：1420-9136

文摘

The most recent tsunami observed along the coast of the island of Puerto Rico occurred on October 11, 1918, after a magnitude 7.2 earthquake in the Mona Passage. The earthquake was responsible for initiating a tsunami that mostly affected the northwestern coast of the island. Runup values from a post-tsunami survey indicated the waves reached up to 6?m. A controversy regarding the source of the tsunami has resulted in several numerical simulations involving either fault rupture or a submarine landslide as the most probable cause of the tsunami. Here we follow up on previous simulations of the tsunami from a submarine landslide source off the western coast of Puerto Rico as initiated by the earthquake. Improvements on our previous study include: (1) higher-resolution bathymetry; (2) a 3D-D coupled numerical model specifically developed for the tsunami; (3) use of the non-hydrostatic numerical model NEOWAVE (non-hydrostatic evolution of ocean WAVE) featuring two-way nesting capabilities; and (4) comprehensive energy analysis to determine the time of full tsunami wave development. The three-dimensional Navier–Stokes model tsunami solution using the Navier–Stokes algorithm with multiple interfaces for two fluids (water and landslide) was used to determine the initial wave characteristic generated by the submarine landslide. Use of NEOWAVE enabled us to solve for coastal inundation, wave propagation, and detailed runup. Our results were in agreement with previous work in which a submarine landslide is favored as the most probable source of the tsunami, and improvement in the resolution of the bathymetry yielded inundation of the coastal areas that compare well with values from a post-tsunami survey. Our unique energy analysis indicates that most of the wave energy is isolated in the wave generation region, particularly at depths near the landslide, and once the initial wave propagates from the generation region its energy begins to stabilize.