Information theory and earthquakes: Depth propagation seismicity in northern Chile

Primer Autor
Pasten, Denisse
Co-autores
Saravia, Gonzalo
Vogel, Eugenio E.
Posadas, Antonio
Título
Information theory and earthquakes: Depth propagation seismicity in northern Chile
Editorial
PERGAMON-ELSEVIER SCIENCE LTD
Revista
CHAOS SOLITONS & FRACTALS
Lenguaje
en
Resumen
Mutability is an information theory tool intended to characterize sequences of non-linear phenomena (e.g., earthquakes). In this study, we used mutability to identify and analyze the depth propagation of seismicity in northern Chile. During March/April 2014, several important earthquakes struck northern Chile, including one of magnitude 8.1, producing intense but short-lived aftershock regimes. To better understand this behavior, we used data from the Integrated Plate Boundary Observatory Chile (IPOC) catalog. In a first approach, we considered 101,601 earthquakes registered from January 1, 2007 to December 31, 2014 within a rectangle defined by the coordinates 68 W-72 W and 18S-22S. Based on Gutenberg-Richter analysis, earthquakes with magnitudes of >2.3 (a subset of 79,321 seisms) were selected for further analysis and were grouped by depth into overlapping bins in order to identify the depth propagation of the aftershock regimes. The largest two March 2014 earthquakes produced responses from near the surface to similar to 18 km depth. The largest two early April earthquakes had deeper aftershock regimes. In addition, using static information theory, we performed a detailed layer-by-layer analysis that shows that the March 2014 activity had larger response towards the surface, while the April 2014 activity showed larger activity towards the inner layers. To reach more recent years data from Centro Sismologico Nacional (CSN) covering from 2012 to the end of 2021 as used. The results show a similarity between the mutability and dynamic average depths of seismicity from 2012 to 2021. The mutability of recent years is slightly less than the historic average, which can be interpreted to reflect relaxing mechanisms that are postponing the expected megathrust event in this zone.
Fecha Publicación
2022
Tipo de Recurso
artículo original
doi
10.1016/j.chaos.2022.112874
Formato Recurso
PDF
Palabras Claves
Mutability
Non-linear phenomena
Earthquakes
Information theory
Ubicación del archivo
http://dx.doi.org/10.1016/j.chaos.2022.112874
Categoría OCDE
Matemáticas
Física
Materias
Mutabilidad
Fenómenos no lineales
Temblores
Teoría de la información
Identificador del recurso (Mandatado-único)
artículo original
Versión del recurso (Recomendado-único)
versión publicada
License
CC BY NC-ND 4.0
Condición de la licencia (Recomendado-repetible)
CC BY NC-ND 4.0
Derechos de acceso
acceso abierto
Access Rights
acceso abierto
Id de Web of Science
WOS:001002661900011
ISSN
0960-0779
Tipo de ruta
verde# hibrido
Categoría WOS
Matemáticas
Física
Referencia del Financiador (Mandatado si es aplicable-repetible)
ANID 1190036
CE-DENNA AFB180001
Junta de Andalucia RNM194
Colecciones
Colección Publicaciones Científicas
Colección ANID
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