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One vertical component and two horizontal components of 27 ocean­ bottom seismometer (OBS) data sets along four profiles off eastern Taiwan were obtained using a large air-gun array of the RIV Maurice Ewing dur­ ing summer/fall 1995. From the horizontal components of the OBS data, we identify most refractions converted in the sediment and reflections con­ verted in the crust respectively as the first and later arrivals. These con­ verted arrivals are subsequently used for travel-time modeling of the sedi­ mentary and crustal Poisson's ratios. The overall results show differences of Poisson's ratios in the accretionary prism (0.28-0.3), the continental crust (0.25-0.29) and the oceanic slab (0.23-0.33), and these are associated with the different structural compositions and/or tectonic settings. OBS data modeling of profile EW9509-1, which covers the Ryukyu arc-trench system in the north-south direction, reveals relatively low Poisson's ratios in the northern portion of the Yaeyama accretionary prism (0.28) and in the south­ ern portion of the Ryukyu Arc basement (0.25). Anomalous Poisson's ra­ tios within the accretionary prism and the continental crust may be attrib­ uted to the fractures of the forearc compression beneath the Nanao Basin. From the east-west profiles of EW9509-14 and EW9509-16 across three forearc basins, we also find anomalously high Poisson's ratios (0.27-0.29) for the Ryukyu Arc basement beneath the Nanao Basin. High Poisson's ratios of the overlying plate suggest the presence of fluid-filled micro-cracks, which may be related to the northward movement of the Luzon Arc and the Ganga Ridge. Poisson's ratio decreases northwestward along profile EW9509-23 that is consistent with the increasing crustal thickness north­ westward in the P-wave modeling below the Huatung Basin.

Crustal Poissin's Ration Off Eastern Taiwan From OBS Data Modeling