Publication: TSUNAMIS POR DESLIZAMIENTOS SUBMARINOS LA COSTA PACÍFICA DEL CENTRO-SUR DE CHILE
Date
2016
Authors
PÉREZ GUTIÉRREZ, JULIÁN ANTONIO
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Abstract
El presente trabajo estudia la amenaza y características que podrían tener tsunamis generados por grandes deslizamientos submarinos en la costa Pacífico centro-sur de Chile. Estos fenómenos han sido usualmente descartados en las costas nacionales debido al escaso conocimiento de su ocurrencia, además de lo difícil de su detección.No obstante, una revisión de literatura permite identificar al menos cuatro casos de deslizamientos submarinos potencialmente tsunamigénicos los cuales se analizan con detalle en este trabajo. Para ello se procede a modelar numéricamente la generación, propagación e impacto en el litoral de los tsunamis asociados, mediante un software basado en las ecuaciones de propagación de ondas de Boussinesq, que incorpora términos no lineales y dispersivos.Además, teniendo en consideración que el principal mecanismo desencadenante de deslizamientos submarinos corresponde a terremotos de mediana a alta intensidad, se incluye un escenario de modelación en donde se combina la deformación co-sísmica causada por el terremoto del 27F de 2010, junto a uno de los deslizamientos estudiados.Los resultados arrojan una gran variabilidad en la respuesta, con algunos casos generando tsunamis potencialmente devastadores a nivel local, dando una idea general del comportamiento de tsunamis generados por deslizamientos submarinos, los que se caracterizan principalmente por grandes olas de forma local y una alta frecuencia en el oleaje.Sin embargo, lo variable de los períodos de retorno asociados hace que su incorporación de manera sistemática en estudios de amenaza aún sea un desafío.
This paper studies the threat and features that could have large tsunamis generated by submarine landslides on the Pacific coast south-central Chile. These phenomena have been usually discarded in national coasts due to poor knowledge of their occurrence, in addition to the difficulty of detection.However, a literature review identifies at least four cases of potentially submarine landslide triggered tsunamis which are discussed in detail in this paper. To do this, we proceed to numerically model the generation, propagation and impact on the coast of the associated tsunamis through a software based on the equations of Boussinesq wave propagation incorporating nonlinear and dispersive terms.In addition, considering that the main mechanism triggering submarine landslides corresponds to earthquakes of medium to high intensity, it is included a modeling scenario combining the co-seismic deformation caused by the earthquake 27F 2010 with one of the landslides studied.The results show a large variability in response, with some cases causing potentially devastating tsunamis locally, giving a general idea of the behavior of tsunamis generated by submarine landslides, which are mainly characterized by large and high frequency waves locally.However, the variable of the associated return periods makes their incorporation in systematically study threats still a challenge.
This paper studies the threat and features that could have large tsunamis generated by submarine landslides on the Pacific coast south-central Chile. These phenomena have been usually discarded in national coasts due to poor knowledge of their occurrence, in addition to the difficulty of detection.However, a literature review identifies at least four cases of potentially submarine landslide triggered tsunamis which are discussed in detail in this paper. To do this, we proceed to numerically model the generation, propagation and impact on the coast of the associated tsunamis through a software based on the equations of Boussinesq wave propagation incorporating nonlinear and dispersive terms.In addition, considering that the main mechanism triggering submarine landslides corresponds to earthquakes of medium to high intensity, it is included a modeling scenario combining the co-seismic deformation caused by the earthquake 27F 2010 with one of the landslides studied.The results show a large variability in response, with some cases causing potentially devastating tsunamis locally, giving a general idea of the behavior of tsunamis generated by submarine landslides, which are mainly characterized by large and high frequency waves locally.However, the variable of the associated return periods makes their incorporation in systematically study threats still a challenge.
Description
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Keywords
CHILE , DESLIZAMIENTO , TSUNAMI