利用爆炸震源资料获得三分量旋转地震动

发布时间：2018-05-16 10:57

本文选题：地震学 + 平动速度　；参考：《地球科学》2017年04期

【摘要】：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.
[Abstract]:Three component rotational ground motion is one of the key points in geophysics. Using the observational data of the translational seismograph of the explosion source, three component rotational ground motion is obtained by indirect calculation. Using the observation data of 500kg explosive, the distance between the three explosion points and the observation array is 1.8 and 8.9 km, respectively. The rotational ground motion of the array relative to these three explosion points is calculated. The maximum angular velocities of rotation are 41.65U 21.98 and 0.29 渭 rads / s, respectively, which are close to those of the international counterparts. The attenuation of the peak value of ground motion with epicentral distance is an important problem in seismic engineering. The peak value of rotation angular velocity of three components is extracted, and the peak value of three components is fitted by exponential function, and the attenuation relation of angular velocity peak of three components of rotational ground motion with epicenter distance is preliminarily obtained. The main characteristic of the attenuation curve is that the energy of rotation angular velocity of 3km is rapidly decaying, and the attenuation gradually slows down after the attenuation is larger than 5km, and the variation of the curve tends to be more and more gentle with the increase of epicentral distance.
【作者单位】：中国地震局地球物理勘探中心;
【基金】：国家自然科学基金项目(Nos.41374099,41074069)
【分类号】：P315.7

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