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阿里亚斯烈度是表征地震潜在破坏的重要地震动参数。使用台湾集集MW7.6地震的强地震动记录,分析了水平、竖直、平行断层及垂直断层分量阿里亚斯烈度的空间分布特征;考察了断层上盘效应对地震动的影响;建立了考虑场地条件的阿里亚斯烈度与峰值地动加速度(PGA)的经验转换关系;通过本次地震阿里亚斯烈度观测值和目前常用阿里亚斯烈度衰减关系预测值的对比,探讨了经验衰减关系的适用性。结果表明:整体上阿里亚斯烈度竖向分量远小于水平分量,接近90%的台站竖向与水平向比值介于0.1~0.6;断层距约40km范围内阿里亚斯烈度垂直断层分量约高出平行断层分量20%;断层上盘阿里亚斯烈度值系统性地高于断层下盘,显示出强烈的上盘效应;场地条件对阿里亚斯烈度与峰值地动加速度相关性具有显著影响,阿里亚斯烈度随峰值地动加速度的增大和场地VS30的降低而增大;整体上,断层距40km内的C类场地及80km内的D类场地上阿里亚斯烈度观测值小于经验衰减关系的预测均值,而当断层距>80km时,D类场地观测值远大于预测均值,考虑到地震的特性差异,Travasarou等(2003)和Lee等(2012)的衰减模型及Stafford等(2009)的模型4预测值与观测值较为接近。
Arias intensity is an important ground motion parameter characterizing the potential damage of the earthquake. Based on the records of strong earthquakes in Taiwan Ji-Ji-MW7.6 earthquake, the spatial distribution characteristics of Ariasian intensity of horizontal, vertical, parallel faults and vertical fault components are analyzed. The effect of the hanging wall effect on ground motion is investigated. The relationship between Arias intensity and peak ground motional acceleration (PGA) considering the site conditions is empirically converted. Based on the comparison between the predicted Arial intensities observed in this earthquakes and the current predictions of Arial’s intensity decay, the relationship between empirical decay Applicability. The results show that the vertical component of Ariyas intensity is much smaller than the horizontal component, and the vertical and horizontal ratios of stations near 90% are between 0.1 and 0.6. The vertical fault component of Ariyas intensity is about high Out of parallel fault component 20%; Ariyas intensity value of the upper section of the fault is systematically higher than that of the lower fault, showing a strong hanging wall effect; site conditions have a significant effect on the correlation between the Arias intensity and the peak ground motion acceleration, The intensity of Arias increases with the increase of peak ground acceleration and the decrease of site VS30. On the whole, the observed Arial intensities of the Classes within the distance of 40km and the D within 80km are less than those of the empirical attenuation Predict the mean, and when the distance between faults is more than 80km, the observed values in Class D sites are far greater than the predicted mean values. Taking into account the characteristics of the earthquakes, the attenuation models of Travasarou et al. (2003) and Lee et al. (2012) and the model of Stafford et al. 4 The predicted value is close to the observed value.