The 2-D lithosphere model for Taiwan using geodetic data
Speaker: Chi-Fang Lee Adviser: Wu-Lung Chang
Abstract
While recent geophysical measurements, including Global Positioning System (GPS) and precise leveling surveys, have clarified the mechanisms of active mountain building in the Taiwan arccontinent collision, the geometry of faults beneath the island remains unclear. The leveling and GPS vertical velocities generally reveal a dome‐shaped pattern with uplift of ∼0.2–18.5 mm/yr in the interior of the mountain range and subsidence on the flanks of the mountains and coastal plains. In this talk, I will introduce two kinematic models which invert the fault geometry and slip rates using different geodetic data. First model only used GPS data, and the model produce a combined slip rate of 27–41 mm/yr on the frontal thrusts in western Taiwan and 37–48 mm/yr of slip on the Longitudinal Valley Fault. Another used GPS and leveling data, the model suggests a combined slip rate of 40 mm/yr on the frontal thrusts and 45 mm/yr on the Longitudinal Valley fault. In addition, leveling data improved spatial resolution, so they regarded the model requires an additional source of crustal thickening under the Central Range to match the observed high spatial distribution uplift rates.
Reference
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Ching, K. E., M. L. Hsieh, K. M. Johnson, K. H. Chen, R. J. Rau, and M. Yang (2011), Modern vertical deformation in Taiwan: Precise leveling measurements and continuous GPS observations, 2000‐2008, Journal of Geophysical Res.-Solid Earth, 116, B08406, doi:10.1029/2011JB008242.