山东地区近震地震波速与地壳结构  

SEISMIC WAVE VELOCITY OF LOCAL EARTHQUAKES AND CRUSTAL STRUCTRUE IN SHANDONG AREA

作　　者：林怀存[1] 

机构地区：[1]山东省地震局

出　　处：《华北地震科学》1989年第3期82-90,共9页North China Earthquake Sciences

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:V_p=6.18公里/秒,V_s=3.6公里/秒。 2、根据反射波P_(11)、S_(Pn)引折射波P_n、S_(Sn)的资枓,取单层地壳模型得到反射波和折射波的速度为:V_(p11)=6.43公里/秒,V_(S11)=3.72公里/秒,V_(pn)=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。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: V_p=0.18KM/S, V S= 3.0KM/S. 2. Based on reflection wave P_(11), S_(11) and refraction wave P_n、S_n, from a single-layer crust model, the velocity of refraction and reflection waves are obtained. V_(P11)=6.43KM/S, V_(S11)=3.72KM/S, V_(p_n)=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.

关 键 词：折射波 地壳结构 地震波速 近震 反射波 地壳模型 直达波 时距曲线 走时曲线 波振幅 

分 类 号：P315[天文地球—地震学]