@article{fdi:010058230,
  title = {{C}rustal deformation at the southernmost part of the {R}yukyu subduction ({E}ast {T}aiwan) as revealed by new marine seismic experiments},
  author = {{T}heunissen, {T}. and {L}allemand, {S}. and {F}ont, {Y}vonne and {G}autier, {S}. and {L}ee, {C}. {S}. and {L}iang, {W}. {T}. and {W}u, {F}. and {B}erthet, {T}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he southernmost part of the {R}yukyu subduction, where the {P}hilippine {S}ea {P}late is subducting under the {E}urasian {P}late, is known to be a very seismically active region of transition from a north-dipping subduction along the {R}yukyu subduction to an similar to {SE}-{NW} collision along the {T}aiwanese orogenic wedge. {I}n this paper, we will focus on the {R}yukyu forearc area close to {T}aiwan where the deformation is paroxysmal. {I}n order to decipher the nature of the seismic deformation in this region, a three month passive experiment, combining 22 {O}cean {B}ottom {S}eismometers and 51 onland stations, has been led. {S}tarting from an a-priori heterogeneous model, we have obtained 801 well-located earthquake hypocenters, a precise {P}-wave tomography model and 14 focal mechanisms. {T}he seismicity along the {R}yukyu forearc is mainly located not only in the vicinity of the {I}nterplate {S}eismogenic {Z}one ({ISZ}) but also within both the subducting {PSP} and the overriding plate. {S}eismicity within the upper-plate is essentially localized east of {N}anao basin where {NW}-{SE} extension occurs, and northwest of the {H}oping basin where strike-slip dominates. {A}s revealed by both the {P}-wave velocity structure and the newly derived seismicity, we argue that a sub-vertical step offsetting the subducting {PSP} around 10 km may support the presence of a trench-parallel tear. {T}he {PSP} also undergoes extension in its upper part that is probably caused by buckling and slab pull. {T}he {P}-wave velocity structure reveals three other major features: (1) a continuity between the {C}entral {R}ange and the {R}yukyu {A}rc with a shallower {M}oho (similar to 30 km depth) between similar to 122.3 degrees {N} and similar to 122.5 degrees {N} along the {R}yukyu {A}rc, (2) high {P}-wave velocities along the eastern side of the {C}entral {R}ange and, (3) two bodies with similar high crustal velocities (6.5-7.0 km/s) at 12-18 km depths, embedded within the {R}yukyu arc basement, just north of {H}oping {B}asin and north of the {N}anao {B}asin.},
  keywords = {{P}assive experiment {RATS} ({R}yukyu {A}rc: {T}ectonics and {S}eismology) ; {C}ollision-{S}ubduction transition east of {T}aiwan ; {R}yukyu forearc ; {A}bsolute earthquake location ; {F}ocal mechanisms ; 3{D} approach (a priori 3{D} {P}-wave velocity model) ; {PHILIPPINES} {MER}},
  booktitle = {},
  journal = {{T}ectonophysics},
  volume = {578},
  numero = {{SI}},
  pages = {10--30},
  ISSN = {0040-1951},
  year = {2012},
  DOI = {10.1016/j.tecto.2012.04.011},
  URL = {https://www.documentation.ird.fr/hor/fdi:010058230},
}