摘要
井水位观测系统可作为一个天然体应变计,把体应变固体潮理论值作为系统的输入,把井水位观测值作为系统的输出,则井水位观测值的维尼迪柯夫调和分析结果即为系统的传递函数。取半日波的M2波的振幅比作为井水位观测系统的灵敏度,其倒数即为格值。在此基础上,可由井水位的分钟值计算出汶川Ms8.0地震激励出的水震波幅度。利用地震仪面波量测出瑞雷面波在径向和垂直向的位移最大幅度及其周期,根据位移散度公式就可计算出汶川地震所激励的地壳体应变波。计算结果表明,瑞雷面波激励出的体应变波比井水位得到的水震波约大1个数量级。
The well-water-level system is a natural body strain gauge. Taking the theoretical earth tide value of body strain as the input of the system and digital observations of well level of the system as the output, the harmonic analysis results of the digital observation of well level computed with Venidikov＇ s harmonic analysis method is transfer function （sensitivity） of the well level system. The paper takes the amplitude factor of wave M2 as the theoretical calibration value η of well level system. The water-level shock wave excited by Wenchuan Ms8.0 earthquake is calculated by use of the minute values of water level of five wells in May ,2008. Meanwhile, the Rayleigh wave data including the maximum amplitude of radial and vertical displacement and its periods, are recorded by seismograph. Body strain wave excited by Wenchuan earthquake is calculated with displacement divergence formula. The result is the volume strain from seismograph which is high frequency is ten times bigger than the one from well-water-level system which is low frequency. The difference between them is discussed at last.
出处
《大地测量与地球动力学》
CSCD
北大核心
2009年第3期28-33,共6页
Journal of Geodesy and Geodynamics
基金
中国地震局老专家科研基金
关键词
井水位
地震面波
格值
水震波
体应变波
well level
surface waves
theoretical calibration value
water-level shock wave
volume strain wave
