Publication: Estudio de la fuente sísmica con estaciones en tierra y mar
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2021-09-17
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Universidad Complutense de Madrid
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Abstract
Los parámetros focales de los terremotos con foco en mar están generalmente determinados con incertidumbres muy grandes, debido a la ausencia de estaciones sísmicas en tierra cercanas al epicentro. El uso de redes con estaciones en tierra en combinación con sismómetros de fondo marino, ayuda a reducir la distancia epicentral y la brecha acimutal, mejorando de este modo la estimación de los parámetros focales de los terremotos. Un segundo factor muy importante que mejora la precisión de las localizaciones hipocentrales, es el uso de un modelo de Tierra específico para la zona de estudio y en especial modelos 3D. Aunque, actualmente existen numerosos modelos de Tierra 1D globales, es difícil encontrar modelos 3D para determinadas regiones y que además tengan una resolución valida, para poder ser utilizados como modelos en las localizaciones hipocentrales de terremotos. Además de estos factores, es importante utilizar un método de búsqueda hipocentral que sea robusto, como es el caso de los métodos actuales de localización no lineal, y que se pueda aplicar con modelos de Tierra 3D...
The focal parameters of earthquakes with an offshore focus are generally determined with very large uncertainties, due to the absence of seismic stations on land, close to the epicenter. The use of networks with ground stations in combination with ocean bottom seismometers helps to reduce the epicentral distance and the azimuthal gap, thus improving the estimation of the focal parameters of earthquakes. A second important factor that improves the precision of hypocentral locations is the use of a specific Earth model for the study area and especially 3D models. Although there are currently numerous global 1D Earth models, it is difficult to find 3D models for certain regions and that also have a valid resolution, to be able to be used as models in hypocentral earthquake locations. In addition to these factors, it is important to use a hypocentral search method that is robust, as is the case with current non-linear location methods, and can be applied with 3D models...
The focal parameters of earthquakes with an offshore focus are generally determined with very large uncertainties, due to the absence of seismic stations on land, close to the epicenter. The use of networks with ground stations in combination with ocean bottom seismometers helps to reduce the epicentral distance and the azimuthal gap, thus improving the estimation of the focal parameters of earthquakes. A second important factor that improves the precision of hypocentral locations is the use of a specific Earth model for the study area and especially 3D models. Although there are currently numerous global 1D Earth models, it is difficult to find 3D models for certain regions and that also have a valid resolution, to be able to be used as models in hypocentral earthquake locations. In addition to these factors, it is important to use a hypocentral search method that is robust, as is the case with current non-linear location methods, and can be applied with 3D models...
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Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Físicas, Departamento de Física de la Tierra y Astrofísica, leída el 05-05-2021