Shear-wave velocity structure of upper mantle under Taiwan from the array analysis of surface waves

A one-dimensional shear-wave velocity structure in the top 200 km of upper mantle under the Central Range (CR) of Taiwan was proposed from inversion of fundamental-mode Rayleigh-wave phase velocity, which is determined from array analysis. Crust under CR has relatively low velocities with the thickness of 40 - 50 km when comparing with other regions in Taiwan. This might imply the existence of a mountain root. Upper-mantle low velocity zone with S-wave velocities of about 4.25 similar to 4.4 km/sec is also derived. The thin lid (similar to 30 km) with a relatively high velocity of 4.90 km/sec reveals the probable connection with the lithosphere of the Eurasian plate. The overall thickness of lithosphere under CR is about 80 km, which is approximate to those under the adjacent sea areas of China. In other words, the upper mantle beneath CR is a part of the Eurasian plate.