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三分量旋转地震动是目前地球物理研究重点之一.利用爆炸震源的平动地震仪观测资料,通过间接计算获得三分量旋转地震动.利用了3炮500kg炸药的观测资料,3个爆炸点到观测台阵的距离分别是1.8、2.8和8.9km,计算得到了台阵相对于这3个爆炸点的旋转地震动,其最大峰值旋转角速度分别是41.65、21.98和0.29μrads/s,与国际同行的旋转地震动结果量级接近.地震动峰值随震中距的衰减是地震工程中关注的问题.提取出三分量的旋转角速度峰值,利用指数函数对三分量的峰值进行拟合,初步得到三分量的旋转地震动角速度峰值随震中距的衰减关系.衰减曲线的主要特征是,1~3km旋转角速度能量迅速衰减,大于5km以后衰减逐渐减慢,随着震中距增大曲线的变化越来越趋于平缓.
The three-component rotary ground motion is one of the most important researches in geophysics.Using the observational data of the translational seismograph of the explosive source and obtaining the three-component rotational ground motion by indirect calculation, the observation data of 500kg explosives with 3 guns and 3 explosive points are used The distance of the observing array is 1.8, 2.8 and 8.9 km respectively. The rotational ground motions of the array with respect to the three explosion points are calculated. The maximum peak rotational angular velocities are 41.65, 21.98 and 0.29 murads / s, respectively. Is close to earthquakes.The attenuation of ground motion peak with the epicentral distance is a concern in seismic engineering.A three-component rotational angular velocity peak is extracted and the peak value of the three components is fitted by means of exponential function to obtain three components The main characteristic of the decay curve is that the energy of 1 ~ 3km rotational speed decays rapidly, and the decay gradually slows down when the rotational speed is greater than 5km. As the epicenter distance increases, the curve changes more and more In the gentle.