[S03-P] Poster

[S03-P-06] Comparison three applications of microtremor analysis for investigating shallow S-wave velocity structure in the Western plain of Taiwan

^○Chun-Te Chen¹, Kuo-Liang Wen² (1.Academia Sinica, Taipei, Taiwan, 2.National Central University, Chungli, Taiwan)

We had conducted forty-five array measurements of microtremors and applied GA-Haskell calculation for more than one thousand microtremors H/V measurements in order to investigate the shallow S-wave velocity structure in the Western plain of Taiwan. The microtremor array measurements are reliable to obtain shallow velocity S-wave structure. However, the interval of measurement is about 15 km due to the limitation of economic and manpower issue. GA-Haskell method applies for one thousand microtremors H/V measurements so as to improve the survey interval to about 2 km. Nevertheless, the velocity structure calculated by GA-Haskell method is difficult to quantify the misfit. Hence, we utilize the H/V inversion approach to the same sites of microtremors measurements. The objective of this study is to compare three different methods and figure out the skill of three methods in estimate the shallow velocity. The suspension PS-logging profiles are using to validate our calculations. After the verification, the Horizontal-to-vertical spectral ratios of microtremors (MHVRs) are hence applying to investigate the shallow S-wave velocity structure in Taiwan.