HR: 1340h
AN: OS53A-0972    [Abstracts]
TI: Tectonics of the northwestern corner of the West Philippine Basin: results from new bathymetry and magnetic data
AU: * Hsu, S
EM: hsu@ncu.edu.tw
AF: Institute of Geophysics, National Central University, 300 Chung-Da Road, Chung-Li, 32001, Taiwan
AU: Tsai, C
EM: s0642002@gmail.com
AF: Institute of Geophysics, National Central University, 300 Chung-Da Road, Chung-Li, 32001, Taiwan
AU: Doo, W
EM: wenbindoo@gmail.com
AF: Institute of Geophysics, National Central University, 300 Chung-Da Road, Chung-Li, 32001, Taiwan
AU: Lee, C
EM: leecs@ntou.edu.tw
AF: Institute of Applied Geosciences, National Taiwan Ocean University, 2, Pei-Ning Road, Keelung, 20224, Taiwan
AU: Chang, T
EM: tonycmc@gmail.com
AF: Institute of Geophysics, National Central University, 300 Chung-Da Road, Chung-Li, 32001, Taiwan
AB: In order to meet the requirement of the Law of the Sea, we have conducted a survey of multi-beam bathymetry and magnetic data during a continental shelf survey in northwestern corner of the West Philippine Basin. The bathymetric images show obvious fracture zones trending NE-SW. Post-spreading volcanism is found in this region; some sea-mounts are across a fracture zone but some are truncated by a fracture zone. It suggests in fact the different stages of volcanism. In addition to obvious spreading fabrics, overlapping spreading features are also found in the northern part of the study area. The bathymetric depressions close to the Gagua Ridge in the west and Ryukyu Trench in the north are filled by deep-sea sediments. We have compiled the newly collected magnetic data and reduced the data by IGRF model. The magnetic data are then inverted to get the equivalent magnetization distribution of the study region. We have also conducted an age model simulation to infer the probable age of the oceanic crust of the northwestern corner of the West Philippine Basin.
DE: 3000 MARINE GEOLOGY AND GEOPHYSICS
DE: 3040 Plate tectonics (8150, 8155, 8157, 8158)
DE: 3045 Seafloor morphology, geology, and geophysics
SC: Ocean Sciences [OS]
MN: 2007 Fall Meeting