Abstract
Shallow S-Wave Velocity Structures in the Western Coastal Plain of Taiwan
Highlights
The western coastal plain of Taiwan is an important economic zone with a large population
Array measurements of microtremors were conducted at seven sites throughout the western coastal plain to obtain shallow S-wave velocity structures
Because the Maximum Likelihood Method (MLM) applies weighting functions known as maximum likelihood filters to suppress other waves of different wavenumbers, it shows a higher resolution than BeamForming Method (BFM) for the estimation of the F-K spectrum when the incoherent noise is much smaller than the power of the propagating waves (Capon 1969; Liaw and McEvilly 1979; Zerva and Zhang 1996)
Summary
The western coastal plain of Taiwan is an important economic zone with a large population. It is necessary to conduct site-effect estimations, theoretical simulations of strong motion, and seismic hazard assessments For these forgoing works, important information about the subsurface structure, especially the shallow S-wave velocity is essential. A Rayleigh-wave inversion technique using array records of microtremors has been emphasized as a useful method for obtaining S-wave velocity structures (e.g., Horike 1985; Matsushima and Okada 1990; Sato et al 1991; Kawase et al 1998; Satoh et al 2001a). Two average S-wave velocity structures (including those of the western coastal plain and the Western Foothills) of the shallow crust in southwestern Taiwan were inverted and confirmed by 2D finite-element strong motion simulations. Array measurements of microtremors were conducted at seven sites throughout the western coastal plain to obtain shallow S-wave velocity structures. The structural contour map of the top of the Pliocene formations outlined in Fig. 1 exhibits the influences of the Peikang Basement High on the depth of interfaces above that
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