[S07-P] Poster

[S07-P-03] Strong Ground Motion Simulation by Combining Stochastic Green's Function Method with Hybrid Slip Model for February 6, 2016 Meinong, Taiwan Earthquake

^○Cheng-Feng Wu, Huey-Chu Huang (National Chung Cheng University, Chiayi, Taiwan)

A damage earthquake (Mw 6.53), which has struck the southern Taiwan, occurred in Meinong District of Kaohsiung City on February 6, 2016 (February 5 07:57:26.1 UTC). According to the relevant reports, many buildings collapsing during the seismic shakings were caused by local site effect in Tainan. To investigate the effect of shallow velocity structure on seismic ground motion, we calculate the broadband ground motions between 0.1-10 Hz by using the stochastic Green's function method. In this study, the velocity structures are established by integrating the crustal velocity structures and the near-surface velocity structures (0-1500 m) estimated from the microtremor array data. About the source model, we adopt a hybrid k-squared slip model with an asperity covering 1/4 of the fault area. The shallow velocity structures can well improve the synthetic results including amplitudes and phases and the directivity pulses are successfully reproduced at many stations. They indicate that the possible reasons for the earthquake disasters in Tainan are associated with a combination of forward-directivity and soil amplification effects. Thus, it is feasible to do the 1-D broadband strong motion simulations at the area using the stochastic Green's function method with hybrid k-squared slip distribution.