Data/hora: 07/06/2024 01:24:38

Provedor de dados: 	5	
País: 	France	
Título: 	Spatial variations in the frequency-magnitude distribution of earthquakes in the southwestern Okinawa Trough	
Autores: 	Lin, Jing-yi; Sibuet, Jean-claude; Lee, Chao-shing; Hsu, Shu-kun; Klingelhoefer, Frauke.	
Data: 	2007-05	
Ano: 	2007	
Palavras-chave: 	Magma chamber; Slab tear; Southern Okinawa Trough backarc basin; B Values.	
Resumo: 	The relations between the frequency of occurrence and the magnitude of earthquakes are established in the southern Okinawa Trough for 2823 relocated earthquakes recorded during a passive ocean bottom seismometer experiment. Three high b-values areas are identified: (1) for an area offshore of the Ilan Plain, south of the andesitic Kueishantao Island from a depth of 50 km to the surface, thereby confirming the subduction component of the island andesites; (2) for a body lying along the 123.3 degrees E meridian at depths ranging from 0 to 50 km that may reflect the high temperature inflow rising up from a slab tear; (3) for a third cylindrical body about 15 km in diameter beneath the Cross Backarc Volcanic Trail, at depths ranging from 0 to 15 km. This anomaly might be related to the presence of a magma chamber at the base of the crust already evidenced by tomographic and geochemical results. The high b-values are generally linked to magmatic and geothermal activities, although most of the seismicity is linked to normal faulting processes in the southern Okinawa Trough.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/2007/publication-3036.pdf	
Editor: 	TERRAPUB	
Relação: 	http://archimer.ifremer.fr/doc/00000/3036/	
Formato: 	application/pdf	
Fonte: 	Earth, Planets and Space (1343-8832) (TERRAPUB), 2007-05 , Vol. 59 , N. 4 , P. 221-225	
Fonte: 	2007 TERRAPUB