Spatial variations in the frequency-magnitude distribution of earthquakes in the southwestern Okinawa Trough

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• 作者：Jing-Yi Lin ; Jean-Claude Sibuet ; Chao-Shing Lee ; Shu-Kun Hsu…
• 关键词：b ; Values ; southern Okinawa Trough backarc basin ; slab tear ; magma chamber
• 刊名：Earth, Planets and Space
• 出版年：2007
• 出版时间：April 2007
• 年：2007
• 卷：59
• 期：4
• 页码：221-225
• 全文大小：407KB
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• 作者单位：Jing-Yi Lin (17) (47)
  Jean-Claude Sibuet (17)
  Chao-Shing Lee (27)
  Shu-Kun Hsu (37)
  Frauke Klingelhoefer (17)
  
  17. Ifremer, Centre de Brest, B.P. 70, 29280, Plouzané, France
  47. Chaire de Géodynamique, Collège de France, Europ?le de l’Arbois, Bat. Le Trocadé ro - Aile Sud, BP 80, 13545, Aix en Provence cedex 4, France
  27. Institute of Applied Geophysics, National Taiwan Ocean University, 2 Pei-Ning Road, Keelung, 202, Taiwan
  37. Institute of Geophysics, National Central University, Chung-Li, 32001, Taiwan
  
• 刊物类别：Earth Sciences, general; Geology; Geophysics/Geodesy;
• 刊物主题：Earth Sciences, general; Geology; Geophysics/Geodesy;
• 出版者：Springer Berlin Heidelberg
• ISSN：1880-5981

文摘

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°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. Key words b-Values southern Okinawa Trough backarc basin slab tear magma chamber