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本文对比研究了平原地区井下和地面的地震波记录特征,对其走时关系和振幅关系进行了推导,得出: 1.在层状均匀介质条件下,在地面记录到的地震波走时t_c大于在井下记录到的地震波走时t_h,二者之差为 △t=t_c—t_h=cosi_c/V_c·h与此相应,地面震相观测到时T_c滞后于井下震相观测到时T_h,其到时差为△T。 2.定义地面振幅A_c与井下振幅A_h之比为 K=A_c/A_h在特定的条件下,K>1。因而称K为地面振幅相对于井下振幅的放大因子。 分析了静海地震台井下和地面的地震观测资料,得到单台的△T和K的对比结果,并将其记录特征分别与基岩地震台的记录特征进行了比较,认为: 1.对于运动学参数,井下较之地面,更逼近于基岩地区的情况。 2.对于动力学参数,统计得出基岩地震台的地动振幅Aμ与A_h,A_c的关系: Aμ=3.50A_h Aμ=0.34A_c。
In this paper, we compared the seismic record features of downhole and ground in plain area and deduced the relationship between traveltime and amplitude. The conclusions are drawn as follows: 1. The seismic traveltime t_c recorded on the ground under stratified homogeneous media is larger than that recorded downhole The arrival time of seismic wave t_h, the difference between the two is Δt = t_c-t_h = cosi_c / V_c · h Correspondingly, when the surface seismic phase observation T_c lags behind when the underground seismic phase observation T_h, the arrival time difference △ T . 2. Define the ratio of ground amplitude A_c to downhole amplitude A_h as K = A_c / A_h Under certain conditions, K> 1. Thus K is the amplification factor of the ground amplitude relative to the downhole amplitude. The seismic observation data of Jinghai Seismostation downhole and ground are analyzed and the results of comparison between △ T and K are obtained. The recorded features are compared with those of bedrock seismograph respectively. The results are as follows: 1. For the kinematics Parameters, downhole than the ground, closer to the bedrock situation. 2. For the kinetic parameters, the relationship between the ground motion amplitude Aμ and A_h, A_c of the bedrock station is obtained: Aμ = 3.50A_h Aμ = 0.34A_c.