Variations of b-values at the western edge of the Ryukyu subduction zone, north-east Taiwan

Type Article
Date 2008-04
Language English
Author(s) Lin Jing-Yi1, 2, Sibuet Jean-Claude2, Hsu S3
Affiliation(s) 1 : Coll France, Chaire Geodynam, Europole Arbois, F-13545 Aix En Provence 4, France.
2 : IFREMER, Ctr Brest, DRO GM, F-29280 Plouzane, France.
3 : Natl Cent Univ, Inst Geophys, Chungli 32001, Taiwan.
Source Terra Nova (0954-4879) (Blackwell science), 2008-04 , Vol. 20 , N. 2 , P. 150-153
DOI 10.1111/j.1365-3121.2008.00801.x
WOS© Times Cited 3
Abstract Using earthquakes relocated in north-east Taiwan, we estimated b-value distribution along a cross-section located near the Ryukyu slab edge, and four b-value anomalous areas are evidenced: (1) a high b-value body lying on top of a low Vp, low Vs and high Vp/Vs sausage-like body was considered as a region of enhanced partial melt or water supply above which seismicity occurs; (2) beneath the Ilan Plain, an anomalous area characterized by b-values slightly higher than 1.1 might give evidence to the magma conduits to the Kueishantao Island; (3) above the Ryukyu Wadati-Benioff zone, at depths ranging from 90 to 110 km, a high b-value anomaly might correspond to the depth where dehydration occurs in the subducting oceanic plate; and (4) a low b-value area located within the Ryukyu slab, at depths ranging from 70 to 90 km, might be linked to the compressive mechanisms shown by focal mechanisms and the bending of the subducting plate.
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