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  龚丽文,陈丽娟,刘琦,郑许东.基于形变仪器同震形变波衰减规律的研究[J].震灾防御技术,2018,(2):399-409, DOI:10.11899/zzfy20180215.

基于形变仪器同震形变波衰减规律的研究
摘要:    基于黔江台2套倾斜仪记录到的442次同震形变波,对比分析其波谱特征,分区域统计其振幅A与震级M的关系。研究发现:①垂直摆的震动周期和阻尼系数均较小,其波谱信息记录较丰富,适合波谱的时频分析;水管仪的基线较长,阻尼系数较大,抗干扰能力较强,其振幅记录较稳定,适合能量衰减分析;②垂直摆与水管仪的A-M关系均呈指数关系,随着震中距的增加,曲线的拟合程度增强,且指数系数b与lna呈负线性相关;③衰减因子k是用来量化同震形变波能量衰减的主要系数,它随着震中距(≤6000km)增加而增大,且各区域的衰减因子具有一定规律性,对后期建立巨大远震触发型地震模型及其参数设置具有一定指示意义。
作者单位
龚丽文 重庆市地震局, 重庆 401147 
陈丽娟 重庆市地震局, 重庆 401147 
刘琦 中国地震局地震预测研究所, 北京 100036 
郑许东 重庆市地震局, 重庆 401147 
关  键  词:水管仪  垂直摆  同震形变波  衰减因子  振幅-震级关系
DOI:10.11899/zzfy20180215
基金项目:2017年度震情跟踪定向工作任务(2017010231、162202)
收稿日期:2017-08-10
作者简介:龚丽文,男,生于1988年。助理工程师。主要研究方向:定点形变监测及前兆异常。E-mail:glw777@126.com
通讯作者:
Study on Attenuation Law of Co-seismic Deformation Waves Based on Instruments
Abstract:      For 442 co-seismic deformation waves recorded by two sets of inclinometers in Qianjiang station, we conducted comparison and analysis on the spectrum features, and the statistics relationship between amplitude A and magnitude M. The results are as follows:① Vertical pendulous, with smaller vibration period and damping coefficient, which can record abundant spectral information, is suitable for the time-frequency analysis for spectrum. Water-tube tilt, with longer baseline, bigger damping coefficient, and higher anti-interference capacity, which amplitude record is relatively stable, is suitable for analysis of energy attenuation. ② The amplitude-magnitude relationship is exponential, and the fitting degree of A-M curve increases with the epicenter distance. Whereas the index coefficient b is inversely proportional with the lna. ③ The coefficient (k) is the main factor used to quantify the energy attenuation of co-seismic deformation waves, and the earthquakes in different areas are with different attenuation coefficients that increase with the epicenter distance (D ≤ 6000km). The above results are of significance for constructing model of the earthquake induced by huge earthquake, as well as for determining its parameter settings.
Keywords:  Water-tube tilt  Vertical pendulous  Co-seismic deformation waves  Attenuation coefficient  Amplitude-magnitude relationship
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