2016年日本Off-Mie <em>M</em><sub>w</sub> 5.8级地震的海底地震动非线性反应特征

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (19) : 157-163.

论文

2016年日本Off-Mie M_w 5.8级地震的海底地震动非线性反应特征

胡进军1,2，周旭彤1,2

作者信息 +

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

HU Jinjun1,2, ZHOU Xutong1,2

Author information +

文章历史 +

摘要

近年来全球频繁发生的海域地震对海洋工程的抗震设计提出了新的要求。为了研究海底地震动的非线性反应特性，基于日本Nankai海域DONET1海底台站记录的2016年Off-Mie Mw 58级地震的近场地震动数据，采用水平（horizontal)和竖直(vertical)方向傅里叶谱比(H/V)方法分析了具有强烈非线性反应特征的4个台站的主频(fpeak)和峰值(Apeak)随时间的变化规律、评估了此次地震海底场地非线性响应恢复时间。研究结果表明：部分海底台站基于H/V识别的fpeak在S波到时出现明显下降，S波结束后趋于平稳且低于P波到时呈现的非线性反应特征；H/V识别的Apeak则呈指数式上升趋势。通过对产生强烈非线性反应台站的震后地震动谱比分析，表明fpeak和Apeak在震后20 d左右恢复到震前参考值，个别台站由于遭受强烈非线性反应可能导致速度结构的改变致使fpeak没有恢复。

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.

导出引用

胡进军，周旭彤. 2016年日本Off-Mie M_w 5.8级地震的海底地震动非线性反应特征[J]. 振动与冲击, 2021, 40(19): 157-163

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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