@article{fdi:010052973,
  title = {{T}he largest instrumentally recorded earthquake in {T}aiwan : revised location and magnitude, and tectonic significance of the 1920 event},
  author = {{T}heunissen, {T}. and {F}ont, {Y}vonne and {L}allemand, {S}. and {L}iang, {W}. {T}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {R}yukyu subduction is known to generate very few earthquakes in its central segment contrarily to its two extremities. {W}e focus in this study on the southernmost part of the {R}yukyu subduction zone offshore east {T}aiwan. {O}ur first task was to build a homogeneous earthquake catalogue for the period 1900-2007. {T}he new catalogue provides homogenized {M}'({W}) magnitudes and shows that several {M}'({W}) >= 7.0 earthquakes occurred offshore {H}ualien and {S}uao cities. {W}e then focused on the 1920 {J}une 5 earthquake (reported surface wave magnitude 8.1) previously located beneath the accretionary prism. {T}he revised moment magnitude has been estimated in our catalogue at 7.7 +/- 0.2. {I}t is the biggest earthquake ever recorded in the {T}aiwan area but the fault that has produced this earthquake has not yet been identified with confidence. {W}e relocated this event using regional phases (seismological bulletins archived at the {C}entral {W}eather {B}ureau of {T}aiwan) about 50 km {NNE} and shallower of its former location, that is, within the {R}yukyu {A}rc basement. {A}ccording to earthquake bulletin information, revised magnitude, new hypocentral determination and known regional faults, we propose four potential active faults as candidates for the slip associated to this event: (1) the interplate seismogenic zone ({ISZ}), (2) an out-of-sequence thrust cutting through the forearc and branching on the {ISZ}, (3) a {NS} strike-slip fault cutting through the {R}yukyu arc and (4) a {N}-{S}, westward dipping thrust fault, affecting the {P}hilippine {S}ea {P}late east of the {L}uzon {A}rc. {T}he best compromise is to consider a rupture along the {ISZ} with a shallow nucleation possibly along a splay-fault followed by a downward and lateral propagation of the rupture that would explain the lack of significant seafloor motion and subsequent tsunami. {W}e also estimate the maximum seismic coupling of the {ISZ} in the region east of {T}aiwan to about 0.4. {I}n parallel, the evidences of aseismic slip occurring along the {ISZ} allow us to conclude that this region should only be affected by {M} < 8 earthquakes.},
  keywords = {{S}eismicity and tectonics ; {S}ubduction zone processes ; {C}ontinental ; margins: convergent ; {D}ynamics: seismotectonics},
  booktitle = {},
  journal = {{G}eophysical {J}ournal {I}nternational},
  volume = {183},
  numero = {3},
  pages = {1119--1133},
  ISSN = {0956-540{X}},
  year = {2010},
  DOI = {10.1111/j.1365-246{X}.2010.04813.x},
  URL = {https://www.documentation.ird.fr/hor/fdi:010052973},
}