Analysis on some strong ground motion records from the 2016 Kumamoto earthquake series

2018 2nd International Workshop on Renewable Energy and Development

能源学;经济学

Song, Yana^1 ; Tao, Zhengru^1

Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, China^1

关键词: Directivity effect;    Distribution characteristics;    Earthquake sequences;    Earthquake series;    Fourier amplitudes;    Predominant frequency;    Spectrum ratio;    Strong ground motion;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/153/6/062022/pdf
DOI  :  10.1088/1755-1315/153/6/062022

来源: IOP

【 摘 要 】

The 2016 Kumamoto earthquake sequence started with an MJMA 6.5 earthquake in Kumamoto Prefecture on April 14, 2016, which is the foreshock. And a larger earthquake of MJMA 7.3 occurred on April 16, which is the mainshock. We analyzed the data of K-NET stations to get the distribution characteristics of PGA[3]. The characteristics of foreshock and mainshock is a little different. This phenomenon may be caused by fault directivity effect. We selected strong motion recordings and calculated the curve based on the fourier amplitude H/V spectrum ratio method [2], then identified the predominant frequency to analyze the nonlinear site effect.