Nonlinear response characteristics of seafloor ground motions to 2016 off-Mie M.w5.8 earthquake in Japan
HU Jinjun1,2, ZHOU Xutong1,2
1. Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China;
2. Key Laboratory of Earthquake Engineering and Engineering Vibration, China Earthquake Administration, Harbin 150080, China
Abstract:In recent years, frequent sea area earthquakes in the world have put forward new requirements for aseismic design of marine engineering. Here, to study nonlinear response characteristics of seafloor ground motion, based on the near-site seismic data of 2016 off-Mie Mw5.8 earthquake recorded by DONET1 seafloor station in Nankai sea area of Japan, variation laws of dominant frequency (fpeak) and peak value (Apeak) with time change of 4 stations with strong nonlinear response characteristics were analyzed by using the horizontal and vertical Fourier spectral ratio (H/V) method, and the nonlinear response recovery time of the seafloor site after this earthquake was evaluated. The results showed that fpeak values based on H/V identification of some seafloor stations decrease obviously during arrival of S wave, they tend to be stable after S wave is over, and they are lower compared with nonlinear response characteristics during arrival of P wave; Apeak values based on H/V recognition are increasing exponentially. Through analyzing seismic dynamic spectral ratios of stations with strong nonlinear responses, it was shown that fpeak and Apeak return to the reference value before earthquake about 20 days after earthquake; velocity structure of very few stations may change due to strong nonlinear response, so fpeak does not recover.
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