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依据日本防灾科学技术研究所(NIED)地震动数据库的宽频数字记录,统计地震波的傅立叶谱平均周期Tm和加速度反应谱平均周期Tr,分析长周期地震动的主要影响因素;并根据Tm的双拐点震源谱衰减计算式,统计分析地震动峰值加速度和峰值速度比xa/v与Tr之间的关系。结果表明,场地、震中距和震级是形成长周期地震动的主要因素,Tr适合用来评价长周期地震动,Tr和xa/v呈幂指数衰减,并分别给出了震级为6.1、7.2和9.0的三次地震的拟合系数。
The main influencing factors of long-period ground motions were analyzed according to the broad-band digital records of the Japan Earthquake Disaster Prevention Science and Technology Research Institute (NIED) ground motion database and the statistical period Tm of the seismic spectrum and the average period Tr of the acceleration response spectrum. Breakdown point source spectrum attenuation formula, statistical analysis of ground motion peak acceleration and peak velocity ratio xa / v and Tr between the relationship. The results show that the site, epicentral distance and magnitude are the main factors that lead to long-period ground motions. Tr is suitable for evaluating long-period ground motions and Tr and xa / v exponentially decay. The magnitude of the earthquakes is 6.1, 7.2 and Fitting coefficient of three earthquakes of 9.0.