Data/hora: 04/06/2024 06:30:36

Provedor de dados: 	5	
País: 	France	
Título: 	Detection of microseismic compressional (P) body waves aided by numerical modeling of oceanic noise sources	
Autores: 	Obrebski, Mathias; Ardhuin, Fabrice; Stutzmann, Eleonore; Schimmel, Martin.	
Data: 	2013-08	
Ano: 	2013	
Palavras-chave: 	Compressionnal body waves; Noise source; Double frequency microseism; Numerical modeling.	
Resumo: 	Among the different types of waves embedded in seismic noise, body waves present appealing properties but are still challenging to extract. Here we first validate recent improvements in numerical modeling of microseismic compressional (P) body waves and then show how this tool allows fast detection and location of their sources. We compute sources at similar to 0.2 Hz within typical P teleseismic distances (30-90 degrees) from the Southern California Seismic Network and analyze the most significant discrete sources. The locations and relative strengths of the computed sources are validated by the good agreement with beam-forming analysis. These 54 noise sources exhibit a highly heterogeneous distribution, and cluster along the usual storm tracks in the Pacific and Atlantic oceans. They are mostly induced in the open ocean, at or near water depths of 2800 and 5600km, most likely within storms or where ocean waves propagating as swell meet another swell or wind sea. We then emphasize two particularly strong storms to describe how they generate noise sources in their wake. We also use these two specific noise bursts to illustrate the differences between microseismic body and surface waves in terms of source distribution and resulting recordable ground motion. The different patterns between body and surface waves result from distinctive amplification of ocean wave-induced pressure perturbation and different seismic attenuation. Our study demonstrates the potential of numerical modeling to provide fast and accurate constraints on where and when to expect microseismic body waves, with implications for seismic imaging and climate studies.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/00161/27251/25448.pdf

DOI:10.1002/jgrb.50233	
Editor: 	Amer Geophysical Union	
Relação: 	http://archimer.ifremer.fr/doc/00161/27251/

info:eu-repo/grantAgreement/EC/FP7/240009	
Formato: 	application/pdf	
Fonte: 	Journal Of Geophysical Research-solid Earth (2169-9313) (Amer Geophysical Union), 2013-08 , Vol. 118 , N. 8 , P. 4312-4324	
Fonte: 	2013. American Geophysical Union. All Rights Reserved.

info:eu-repo/semantics/openAccess