| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Spatial variations in the frequency-magnitude distribution of earthquakes in the southwestern Okinawa Trough
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| Autores: |
Lin, Jing-yi
Sibuet, Jean-claude
Lee, Chao-shing
Hsu, Shu-kun
Klingelhoefer, Frauke
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| Data: |
2007-05
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| Ano: |
2007
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| Palavras-chave: |
Magma chamber
Slab tear
Southern Okinawa Trough backarc basin
B Values
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| 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.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/2007/publication-3036.pdf
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| Editor: |
TERRAPUB
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| Relação: |
http://archimer.ifremer.fr/doc/00000/3036/
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| Formato: |
application/pdf
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| Fonte: |
Earth, Planets and Space (1343-8832) (TERRAPUB), 2007-05 , Vol. 59 , N. 4 , P. 221-225
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| Direitos: |
2007 TERRAPUB
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