Artículos científicos

URI permanente para esta colecciónhttp://10.0.96.45:4000/handle/11056/14610

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Factores que influyen en la forma de la cola de un tsunami
(Universidad Nacional (Costa Rica), 2009) Chacon-Barrantes, Silvia
The propagation speed of a tsunami depends on the depth of the ocean in which it propagates. As the tsunami crosses the abyssal plain, it suffers modifications in its form due to change in the depths of the ocean bottom. When the tsunami is reflected on coasts, islands or bathymetric discontinuities, the reflected wave is added to the original form of the tsunami. In this work it is identified how several factors affect the wave-form of a tsunami during its propagation through abyssal plains, by numerical simulations of a tsunami´s propagation from Alaska to Hawai.
Importancia de la batimetría de las planicies abisales en la propagación de tsunamis transoceánicos
(Ciencia y tecnología Vol.25,No.1-2 22-33, 2007) Chacon-Barrantes, Silvia
The initial form of a tsunami originated by an homogeneous seismic source consists on a simple wave front. While the tsunami propagates in deep water, this simple form suffers several modifications by the tsunami’s interaction with the ocean basin’s bathymetry. When the tsunami climbs the continental slope, it suffers more modifications due to the bathymetry and topography of the coastal region. The manner in which these local features modify the tsunami’s form depends on the tsunami’s form itself, i.e., different tsunamis arriving at the same location do not have the same form, though resemblances can be identified among them, and also among the same tsunami arriving to different regions. In this paper the importance that these modifications on the tsunami’s form acquires when it approaches to the coast, is identified for the arrival of the Alaska 1964’s tsunami to Hilo Bay in Hawaii and of the Indonesia 2004 and 2005’s tsunamis to Colombo in Sri Lanka.
Modeling a tsunami from the Nicoya, Costa Rica, seismic gap and its potential impact in Puntarenas
(Elsevier (Países Bajos), 2011) Chacon-Barrantes, Silvia; Protti, Marino
Although subduction zones around the world are known to be the source of earthquakes and/or tsunamis, not all segments of these plate boundaries generate destructive earthquakes and catastrophic tsunamis. Costa Rica, in Central America, has subduction zones on both the Pacific and the Caribbean coasts and, even though large earthquakes (Mw = 7.4–7.8) occur in these convergent margins, they do not produce destructive tsunamis. The reason for this is that the seismogenic zones of the segments of the subduction zones that produce large earthquakes in Costa Rica are located beneath land (Nicoya peninsula, Osa peninsula and south of Limón) and not off shore as in most subduction zones around the world. To illustrate this particularity of Costa Rican subduction zones, we show in this work the case for the largest rupture area in Costa Rica (under the Nicoya peninsula), capable of producing Mw ∼ 7.8 earthquakes, but the tsunamis it triggers are small and present little potential for damage even to the largest port city in Costa Rica.The Nicoya seismic gap, in NW Costa Rica, has passed its ∼50-year interseismic period and therefore a large earthquake will have to occur there in the near future. The last large earthquake, in 1950 generated a tsunami which slightly affected the southwest coast of the Nicoya Peninsula. We present here a simulation to study the possible consequences that a tsunami generated by the next Nicoya earthquake could have for the city of Puntarenas. Puntarenas has a population of approximately eleven thousand people and is located on a 7.5 km long sand bar with a maximum height of 2 m above the mean sea level. This condition makes Puntarenas vulnerable to tsunamis.
Simulación rápida de la propagación del tsunami de Chile de 1960 hasta la Bahía de Hilo en Hawaii
(Tecnológico de Costa Rica (TEC) (Costa Rica), 2007) Chacon-Barrantes, Silvia
En este trabajo se simula la propagación del tsunami de Chile de 1960, desde su región de generación hasta la bahía de Hilo en Hawái, empleando un método híbrido que permite obtener resultados en un intervalo relativamente pequeño. Los resultados de este método son comparados con resultados de un modelo numérico en aguas profundas, y con mediciones directas del nivel de mar en la bahía de Hilo. Este método fue diseñado con el propósito de evaluar alertas tempranas y no de reproducir exactamente el registro de un tsunami y los resultados obtenidos son aceptables para este propósito.

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