Publication: ANÁLISIS DE LA INFLUENCIA DEL CATÁLOGO SÍSMICO EN LA ESTIMACIÓN DE LA RECURRENCIA DE TERREMOTOS
Date
2019
Authors
PINILLA MANCILLA, DIANA ADELA
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Abstract
Un catálogo sísmico representa la agrupación de los eventos ocurridos
durante un determinado tiempo en una región. La descripción de estos
eventos en Chile data desde los tiempos de la colonia. Se han llevado a
cabo múltiples esfuerzos (Carvajal et al. (2017), Cisternas (2012)) por interpretar
esas descripciones que se obtienen de periódicos, crónicas de viaje,
y más recientemente, de institutos sismológicos que monitorean la actividad
sísmica a nivel local y global.
Pese a esfuerzos previos (Ruiz & Madariaga, 2018), es conocido que el
registro de los terremotos chilenos, particularmente de eventos históricos,
presenta errores de tamaño, de ubicación y principalmente de completitud.
En este trabajo se confeccionó un catálogo sísmico basándose en el publicado
por NEIC (Comcat, USGS) para terremotos a partir de 1950. Para
eventos anteriores, se hizo una revisión más detallada, utilizando diferentes
catálogos y recti ficando información a partir de artículos y publicaciones.
Las magnitudes contenidas en los catálogos usados como base de datos,
son heterogéneas. Los sismos se registraron con magnitud de ondas superfi ciales (Ms), magnitud de ondas de cuerpo (mb), magnitud local (Ml),
magnitud de duración (Md) y la magnitud con la que se estimará la recurrencia,
la magnitud de momento (Mw). El proceso de homologación para
las magnitudes mb y Ms se hizo mediante regresiones ortogonales, porque
consideran errores asociados tanto a la variable dependiente como a la
independiente.
Además de que las regresiones de este estudio presentan un comportamiento
similar a las regresiones globales propuestas por Scordilis (2006), pero al obtenerse con información del dominio de análisis, podrían considerar
efectos locales que omiten las regresiones globales. Para las magnitudes
Ml y Md, se usaron las relaciones propuestas por Contreras (2009), ya que
no se obtuvo un número de sismos representativo para generar regresiones
adecuadas.
Seismic catalogs grouped events that have occurred during a certain time in a particular region or even in a global scale. The description of these events in Chile dates back to colonial times. Multiple e orts have been made (Carvajal et al. (2017), Cisternas (2012)) to interpret those descriptions obtained from newspapers, travel chronicles, and more recently, seismic institutes that monitor seismic activity at a local and global level. Despite previous e orts (Ruiz & Madariaga, 2018), it is known that the record of Chilean earthquakes has errors in size, location and mainly completeness. In this work a seismic catalog was prepared based on the one published by NEIC (Comcat, USGS) for earthquakes since 1950. For previous events a more detailed review was made using different catalogs and rectifying information from articles and publications. The homologation process for the Mb and Ms magnitudes was made by orthogonal regressions, because they consider errors associated to both the dependent and the independent variables, in addition to presenting behavior similar to the global regressions of Scordilis (2006) and for the magnitudes Ml and Md, the relationships proposed by Contreras (2009) were used due to lack of information.
Seismic catalogs grouped events that have occurred during a certain time in a particular region or even in a global scale. The description of these events in Chile dates back to colonial times. Multiple e orts have been made (Carvajal et al. (2017), Cisternas (2012)) to interpret those descriptions obtained from newspapers, travel chronicles, and more recently, seismic institutes that monitor seismic activity at a local and global level. Despite previous e orts (Ruiz & Madariaga, 2018), it is known that the record of Chilean earthquakes has errors in size, location and mainly completeness. In this work a seismic catalog was prepared based on the one published by NEIC (Comcat, USGS) for earthquakes since 1950. For previous events a more detailed review was made using different catalogs and rectifying information from articles and publications. The homologation process for the Mb and Ms magnitudes was made by orthogonal regressions, because they consider errors associated to both the dependent and the independent variables, in addition to presenting behavior similar to the global regressions of Scordilis (2006) and for the magnitudes Ml and Md, the relationships proposed by Contreras (2009) were used due to lack of information.
Description
Keywords
CATALOGOS SISMICOS , TASAS DE RECURRENCIA , ARBOL LOGICO , TSUNAMIS EN CHILE