Origin of the southern Okinawa Trough volcanism from detailed seismic tomography - art. no. B08308

Type Article
Date 2007-08
Language English
Author(s) Lin Jing-Yi1, 4, Sibuet Jean-Claude1, Lee Chao-Shing2, Hsu Shu-Kun3, Klingelhoefer FraukeORCID1
Affiliation(s) 1 : IFREMER, Ctr Brest, Plouzane, France.
2 : Natl Taiwan Ocean Univ, Inst Appl Geophys, Chilung, Taiwan.
3 : Natl Cent Univ, Inst Geophys, Chungli 32054, Taiwan.
4 : Collège de France, Chaire de Géodynamique, Europôle de l'Arbois, Bat. Le Trocadéro - Aile Sud, BP 80, 13545 Aix en Provence cedex 4, France
Source Journal of Geophysical Research ( JGR ) - Solid earth (0148-0227) (American Geophysical Union), 2007-08 , Vol. 112 , N. B8 , P. NIL_13-NIL_32
DOI 10.1029/2006JB004703
WOS© Times Cited 32
Keyword(s) slab component volcanism, Vp/Vs tomography, Southern Okinawa Trough back arc basin
Abstract Magmatism associated with subducting plate edges or slab tears has been suggested in the southern Okinawa Trough. The cross back-arc volcanic trail, which consists of a cluster of about 70 seamounts, is located above a Ryukyu slab tear lying along the 123.3°E meridian. In November 2003, more than 3300 earthquakes recorded in this area by 15 ocean bottom seismometers and surrounding land stations during a period of 12 days were used to determine the three-dimensional Vp and Vs velocity structures and Vp/Vs ratios. A mantle inflow characterized by low Vp and Vs and high Vp/Vs passing through the slab tear is imaged. The fluid and/or melt component is rising obliquely from the slab tear in the directions of the cross back-arc volcanic trail, the northern slope of the southern Okinawa Trough and to north of Iriomote Island. The asthenospheric intake is also imaged by an inclined chip-like high Vp/Vs and low Vp and Vs body dipping northerly, which might be linked to the slab retreat. West of the slab tear, most of the earthquakes are located around low Vp and Vs and high Vp/Vs bodies, which suggests that the seismicity is related to magmatic and/or fluid activities. East of it, earthquakes are concentrated in an area characterized by high Vp and Vs velocities and low Vp/Vs, suggesting that the magma chamber is absent beneath the axial part of the trough and that normal faulting is the main factor controlling the seismicity.
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Lin Jing-Yi, Sibuet Jean-Claude, Lee Chao-Shing, Hsu Shu-Kun, Klingelhoefer Frauke (2007). Origin of the southern Okinawa Trough volcanism from detailed seismic tomography - art. no. B08308. Journal of Geophysical Research ( JGR ) - Solid earth, 112(B8), NIL_13-NIL_32. Publisher's official version : https://doi.org/10.1029/2006JB004703 , Open Access version : https://archimer.ifremer.fr/doc/00000/3032/