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<title lang=en>P-wave velocity structure of the southern Ryukyu margin east of Taiwan: Results from the ACTS wide-angle seismic experiment</title>
<creator>Klingelhoefer, F.</creator>
<creator>BERTHET, Theo</creator>
<creator>Lallemand, Serge</creator>
<creator>Schnurle, P.</creator>
<creator>Lee, C. -S.</creator>
<creator>Liu, C. -S.</creator>
<creator>Mcintosh, K.</creator>
<creator>THEUNISSEN, Thomas</creator>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Dynamique de la Lithosphere ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>National Taiwan Ocean University (NTOU)</contributor>
<contributor>Institute of Oceanography [Taipei] ; National Taiwan University [Taiwan] (NTU)</contributor>
<contributor>Institute of Geophysics, Univ. of Texas ; Université du Québec</contributor>
<contributor>Institut de recherche en astrophysique et planétologie (IRAP) ; Université Paul Sabatier - Toulouse 3 (UPS) - Observatoire Midi-Pyrénées (OMP) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0040-1951</source>
<source>EISSN: 1879-3266</source>
<source>Tectonophysics</source>
<publisher>Elsevier</publisher>
<identifier>hal-00795573</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00795573</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00795573</source>
<source>Tectonophysics, Elsevier, 2012, 578, pp.50-62. 〈10.1016/j.tecto.2011.10.010〉</source>
<identifier>DOI : 10.1016/j.tecto.2011.10.010</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.tecto.2011.10.010</relation>
<language>en</language>
<subject lang=en>Ryukyu Trench</subject>
<subject lang=en>Marine seismics</subject>
<subject lang=en>Wide-angle seismics</subject>
<subject lang=en>Subduction processes</subject>
<subject>[SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>An active seismic experiment has been conducted across the southern Ryukyu margin east of Taiwan over the whole trench-arc-backarc system in May 2009. Twenty-four ocean bottom seismometers (OBS) were deployed from the Ryukyu trench to the southern Okinawa trough over the Ryukyu arc and forearc. Wide angle seismic data were recorded by the OBS array while coincident reflection seismic data were acquired using a 6 km long streamer and a 6600 cubic inch seismic airgun array. Results from tomographic inversion of 21091 travel time picks along this line allowed us to image crustal structures of the Ryukyu margin down to a depth of 25 km. The transect has been designed to provide a better seismic velocity structure of the subduction zone in a highly deformed area that has produced an M8 earthquake in 1920. The line crosses a seismic cluster of earthquakes which source mechanisms are still poorly understood. The subducting oceanic crust of the Huatung Basin is about 5-6 km thick. The underlying mantle exhibits low seismic velocities around 7.8 km/s suggesting some hydrothermal alterations or alteration of the upper mantle through faults generated by the flexure of the subducting plate as it enters the subduction. Low velocities, up to 4.5 km/s, associated with the accretionary wedge are well imaged from the trench back to the Nanao forearc. A major result concerns the abrupt termination of the buttress at the rear of the accretionary wedge. Despite the low resolution of the tomographic inversion near the subduction interface, several lines of evidence supporting the presence of a low velocity zone beneath the toe of the forearc buttress could be established. The Moho beneath the Ryukyu non-volcanic arc is located at a depth around 25 km depth.</description>
<date>2012-11-20</date>
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