摘要： •Resolving 1-D crustal and upper mantle Vs structures across the Taiwan Strait.•Rayleigh wave phase velocity dispersion curves derived by combining two methods.•The significant differences of the Vs structures are in the shallow crust.•The overall crustal thickness is approximately 30km. Although orogeny tapers off in western Taiwan large and small earthquakes do occur in the Taiwan Strait, a region largely untouched in previous studies owing mostly to logistical reasons. But the overall crustal structure of this region is of particular interest as it may provide a hint of the proto-Taiwan before the orogeny. By combining time domain empirical Green’s function (TDEGF) from ambient seismic noise using station-pairs and traditional surface wave two-station method (TS) we are able to construct Rayleigh wave phase velocity dispersion curves between 5 and 120s. Using Broadband Array in Taiwan for Seismology (BATS) stations in Taiwan and in and across the Strait we are able to derive average 1-D Vs structures in different parts of this region. The results show significant shear velocity differences in the upper 15km crust as expected. In general, the highest Vs in the upper crust observed in the coastal area of Mainland China and the lowest Vs appears along the southwest offshore of the Taiwan Island; they differ by about 0.6–1.1km/s. For different parts of the Strait, the upper crust Vs structures are lower in the middle by about 0.1–0.2km/s relative to those in the northern and southern parts. The upper mantle Vs structure (Moho – 150km) beneath the Taiwan Strait is about 0.1–0.3km/s lower than the AK135 model. The overall crustal thickness is approximately 30km, much thinner and less variable than under the Taiwan Island. The inversion of seismic velocity structures using shorter period band dispersion data in the sea areas with water depth deeper than 1000m should take water layer into consideration except for the continental shelves. 出版者： Elsevier Ltd 出版日期： 2014-02-25 出處： Journal of Asian earth sciences, 2014-02, Vol.81, p.38-52 資源來源： ScienceDirect (Elsevier) Journals 版權： 2013 Elsevier Ltd 識別號： ISSN: 1367-9120 識別號： EISSN: 1878-5786 識別號： DOI: 10.1016/j.jseaes.2013.11.023
