基于改进JMA烈度的脉冲型地震强度预测方法研究  

Research on prediction method of pulse type earthquake intensity based on improved JMA intensity

作　　者：洪志湖 邹德旭 朱龙昌 周仿荣 代维菊 严敬义 闵青云 朱登杰 王闯 HONG Zhihu;ZOU Dexu;ZHU Longchang;ZHOU Fangrong;DAI Weiju;YAN Jingyi;MIN Qingyun;ZHU Dengjie;WANG Chuang(Electric Power Research Institute of Yunnan Power Grid Co.,Ltd.,Kunming 650217,Yunnan,China;CSG Electric Power Research Institute,Guangzhou 510663,Guangdong,China)

机构地区：[1]云南电网有限责任公司电力科学研究院,云南昆明650217 [2]南方电网科学研究院有限责任公司,广东广州510663

出　　处：《建筑科学与工程学报》2024年第4期181-190,共10页Journal of Architecture and Civil Engineering

基　　金：南方电网公司科技项目(YNKJXM20220019)。

摘　　要：为解决中国强震观测台网布设稀疏、脉冲型地震记录少、难以评估某一地区脉冲地震烈度大小的问题,提出了一种预测脉冲型地震烈度的方法,根据历史地震情况、场地条件、地质情况,采取人工合成的方法生成脉冲型地震,研究日本气象厅计测烈度(JMA烈度)与脉冲地震的相关性,并利用中国地震仪器烈度滤波器对JMA烈度方法进行修正。通过算例计算了鲁甸地震53QQC台站的JMA烈度,并绘制了鲁甸地震和汶川地震的烈度分布云图;选取汶川地震部分台站,对比分析改进JMA烈度与典型烈度计算方法。结果表明:从历史地震数据中提取的高频成分与根据场地、地质情况等生成的低频脉冲成分相叠加,可实现脉冲型地震动的人工合成;随着脉冲速度不断增大,JMA烈度呈增大趋势,回归分析结果表明JMA烈度与脉冲速度的对数呈线性关系;随着脉冲周期的不断增大,JMA烈度呈上升趋势,回归分析结果同样显示为线性关系,可见JMA烈度与脉冲地震有较强的关联性,可以用来衡量脉冲型地震动强度;相较于原滤波器,改进后的滤波器有效频带明显更宽,有效频带在0.3~3 Hz之间,能够涵盖中国绝大部分工程结构的卓越频率,有效频带内部更加平坦,而在有效频带外部则呈现更陡峭的响应,更接近理想滤波器的特性。In order to solve the problems that the strong earthquake observation network was sparse in China,the pulse type earthquake records were few,and it was difficult to evaluate pulse type earthquake intensity in a certain area,a method to predict the pulse earthquake intensity was proposed.According to the historical earthquake situation,site condition and geological condition,impulsive earthquakes were generated through the utilization of artificial synthesis.The correlation between Japan Meteorological Agency(JMA)intensity and pulse type earthquakes was studied,and the JMA intensity method was modified by using the intensity filter of China seismic instrument.The intensity of 53QQC station of Ludian earthquake was calculated by an example,and the intensity distribution cloud maps of Ludian earthquake and Wenchuan earthquake were drawn.Utilizing seismic stations from the Wenchuan earthquake,a comparative analysis was conducted between the improved JMA intensity calculation method and conventional intensity calculation methods.The results show that the high frequency components extracted from the historical seismic data are superimposed with the low frequency pulse components generated according to the site and geological conditions,and the artificial synthesis of pulsed ground motions can be realized.With the increasing of pulse speed,the JMA intensity exhibits an increasing trend.Regression analysis indicates a strong linear relationship between the logarithm of the pulse speed and JMA intensity.Simultaneously,as the pulse period progressively increases,JMA intensity shows an ascending trend.Regression analysis for pulse period and JMA intensity also reveals a linear relationship.It is evident that JMA intensity is closely related to pulse seismic and can be utilized for measuring pulse ground motion intensity.In comparison to the original filter,the improved filter features a significantly wider effective bandwidth.The effective frequency band is between 0.3-3 Hz,which can cover the excellent frequency of most en

关 键 词：仪器烈度 带通滤波器 脉冲型地震 地震强度 地震动合成 

分 类 号：P315[天文地球—地震学]