Nonlinear response characteristics of seafloor ground motions to 2016 off-Mie <em>M</em>.<sub>w</sub>5.8 earthquake in Japan

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (19) : 157-163.

Nonlinear response characteristics of seafloor ground motions to 2016 off-Mie M._w5.8 earthquake in Japan

HU Jinjun1,2, ZHOU Xutong1,2

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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 (fpeak) and peak value (Apeak) 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 fpeak 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; Apeak 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 fpeak and Apeak 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 fpeak does not recover.

Key words

seafloor ground motion / DONET1 / Off-Mie Mw5.8 earthquake in Japan / long period / nonlinear response

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HU Jinjun, ZHOU Xutong. Nonlinear response characteristics of seafloor ground motions to 2016 off-Mie M._w5.8 earthquake in Japan[J]. Journal of Vibration and Shock, 2021, 40(19): 157-163

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