摘要:
本文根据山东台网及邻省部分台站记录到的发生在本区的96个地震,得到以下结果: 1、由96个地震的直达波速度和震源深度分布得出山东地区地壳内具有多层构造的特征。直达波平均传播速度为:Vp=6.18公里/秒,Vs=3.6公里/秒。2、根据反射波P11、SPn引折射波Pn、SSn的资枓,取单层地壳模型得到反射波和折射波的速度为:Vp11=6.43公里/秒,VS11=3.72公里/秒,Vpn=8.02公里/秒。利用反射波和折射波资料,得到山东地区平均地壳厚度为36.0公里。通过对折射波进行单点计算,得出鲁西和鲁中部地区地壳厚度大,而沂沭带和沿海区地壳厚度相对较薄。
Abstract:
In this paper, based on 90 earthquakes oecured in Shandong area and recorded by Shandong seismic network and some other stations in its adjacent provinces, the following results are obtained: 1. The P wave velocity and focal depth distribution of the 96 earthquaken show that there is a characteristic of multylayer structure in the crust in Shandong area. The mean propagation velocity of wave is: Vp=0.18KM/S, VS=3.0KM/S. 2. Based on reflection wave P11, S11 and refraction wave Pn、Sn, from a single-layer crust model, the velocity of refraction and reflection waves are obtained. VP11=6.43KM/S, VS11=3.72KM/S, Vpn=8.02KM/S. The mean crustal thickness in Shandong area obtained by reflection wave and refraction wave data is 30.0KM. Through the single point caleutation for refraction wave, the crustal thickness obtained for western and central Shandong areas is large, while the crustal thickness for Yishu belt and the coastal area is relativety thin.
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