martes, abril 25, 2006

Pelicula Poseidon....

El otro día fui al cine y me encontré con el trailer de una pelicula llamada "Paseidón" la cual consistía (por lo que pude ver en el trailer) en un gran barco de crucero que está en medio del océano y de pronto se lo engulle una gran ola (parece ser un Tsunami)... me quedé tan parada que no sabía que decir. (http://raincloud.warnerbros.com/wbmovies/poseidon/trailer2/trailer2_med.mov).

Ya sé que se trata de una película como "El dia de mañana" y este tipo de peliculas...pero aún así, me parece una exageración (no sé si estaré equivocada o no).

La manifestación en la costa de los moviminetos sísmicos son los Tsunamis (TSU = grande ; NAMI = ola). Se generan por la localización submarina de un epicentro sísmico. Las costas son los lugares más vulnerables a tsunamis. Generalmente en origen suelen tener un metro de diámetro (el punto mayor de ondas se alcanza en las costas). Su imporatcia viene dada por el desarrollo en profundidad. Se va desplazando hacia la costa, y a medidad que se hacerca más a ella, va perdiendo profundidad y la ola va ganando altura















Pueden alcanzar alturas de hasta 30 metros en la costa.
Un tsunami tectónico producido en un fondo oceánico de 5 km de profundidad removerá toda la columna de agua desde el fondo hasta la superficie. El desplazamiento vertical puede ser tan solo de centímetros pero si se produce a la suficiente profundidad la velocidad será muy alta y la energía transmitida a la onda será enorme. Aun así, en alta mar la ola pasa casi desapercibida ya que queda camuflada entre las olas superficiales. Sin embargo, destacan en la quietud del fondo marino, el cual se agita en toda su profundidad.

La zona más afectada por este tipo de fenómenos es el Océano Pacífico debido a que en él se encuentra la zona más activa del planeta, el cinturón de fuego. Por ello, es el único océano con un sistema de alertas verdaderamente eficaz.
Históricamente el término tsunami también sirvió para referirse a las olas producidas por huracanes y temporales ("tidal waves") que, como los tsunamis, podían entrar tierra adentro pero estas no dejaban de ser olas superficiales producidas por el viento, aunque un viento excepcionalmente poderoso.
Tampoco se deben confundir con las "olas de marea", pues estas últimas están relacionadas con un desbalance oceánico producido por la atracción gravitacional que ejercen los planetas, especialmente, la Luna y el Sol sobre la Tierra. Este es un fenómeno regular y mucho más lento, aunque en algunos lugares estrechos y de fuerte desnivel se pueden llegar a crear fuertes corrientes.



De ahi que, como bien he dicho antes, no me parezca la forma más a decuada de ver hundir un barco... Las posibilidades de que ocurra por un tsunami son realemente remotas....

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