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

Earth, Planets and Space volume 59, pages 221–225 (2007)Cite this article

Abstract

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.

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Authors and Affiliations

  1. Ifremer, Centre de Brest, B.P. 70, 29280, Plouzané, France

    Jing-Yi Lin, Jean-Claude Sibuet & Frauke Klingelhoefer

  2. Institute of Applied Geophysics, National Taiwan Ocean University, 2 Pei-Ning Road, Keelung, 202, Taiwan

    Chao-Shing Lee

  3. Institute of Geophysics, National Central University, Chung-Li, 32001, Taiwan

    Shu-Kun Hsu

  4. Chaire de Géodynamique, Collège de France, Europôle de l’Arbois, Bat. Le Trocadé ro - Aile Sud, BP 80, 13545, Aix en Provence cedex 4, France

    Jing-Yi Lin

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  1. Jing-Yi Lin
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  2. Jean-Claude Sibuet
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  4. Shu-Kun Hsu
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  5. Frauke Klingelhoefer
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Correspondence to Jing-Yi Lin.

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Lin, JY., Sibuet, JC., Lee, CS. et al. Spatial variations in the frequency-magnitude distribution of earthquakes in the southwestern Okinawa Trough. Earth Planet Sp 59, 221–225 (2007). https://doi.org/10.1186/BF03353098

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