@article{fdi:010054253,
  title = {{R}upture at the flank of the subducted {G}agua ridge : the 18 {D}ecember 2001 earthquake ({M}w 6.8) offshore eastern {T}aiwan},
  author = {{K}onstantinou, {K}. {I}. and {L}ee, {S}. {J}. and {F}ont, {Y}vonne and {K}ao, {H}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he southern {R}yukyus represents an area where different tectonic stress regimes result in high seismicity and increased seismic hazard for nearby areas such as {T}aiwan. {O}n 18 {D}ecember 2001 at 04:03 ({GMT}) a strong earthquake ({M}w 6.8) occurred in the forearc area of the southern {R}yukyu subduction zone. {R}evised moment tensor solutions published by {GCMT} and {BATS} groups show a normal faulting mechanism with some strike-slip component and also point to a shallow focal depth (similar to 12 km). {W}e use arrival times picked at both {T}aiwanese and {J}apanese stations along with a 3{D} geo-realistic a priori velocity model in order to obtain accurate absolute locations for the mainshock and 153 of its aftershocks. {L}ocations are derived by using the {M}aximum intersection ({MAXI}) algorithm which has been used in many previous seismicity studies in the southern {R}yukyus. {T}hese improved locations indicate that the mainshock was caused by the failure of a {NE}-{SW} oriented fault that extends from the edge of the {N}anao forearc sedimentary basin to the {R}yukyu arc basement. {F}ar-field {P} and {SH} waveforms of the mainshock recorded at stations surrounding the source and at distances 30-100 degrees, were inverted for the purpose of investigating its rupture process. {A} non-negative least-squares inversion technique utilizing multiple time windows was used to derive the spatio-temporal slip distribution. {T}he preferred slip distribution model shows that there is one large area of high slip (similar to 0.9 m) at 5-15 km depth that essentially represents the crystalline rocks of the {R}yukyu arc basement. {A}nother smaller area with lower slip (similar to 0.4 m) extends at 10-15 km depth beneath the {N}anao basin. {M}ost aftershocks are located in areas of low slip (< 0.4 m) filling the regions of slip deficit. {I}t is likely that the 18 {D}ecember 2001 earthquake was caused by a stress field interaction generated by the oblique subduction of the {G}agua ridge and the gravitational forces acting at its landward flank.},
  keywords = {{R}yukyu subduction ; {T}aiwan ; {G}agua ridge ; {S}lip distribution ; {S}eamount},
  booktitle = {},
  journal = {{P}hysics of the {E}arth and {P}lanetary {I}nteriors},
  volume = {189},
  numero = {1-2},
  pages = {80--91},
  ISSN = {0031-9201},
  year = {2011},
  DOI = {10.1016/j.pepi.2011.07.010},
  URL = {https://www.documentation.ird.fr/hor/fdi:010054253},
}