摘要
为了研究华北平原中部地区的深部地壳结构,进行了地壳测深的剖面工作。该剖面西起河北省元氏县,东至山东省山东大学郊,全长达270余公里。 全线分布九个爆炸点,构成了相遇和追逐的连续观测系统。根据波的运动学和动力学特点记到了很多一次反射波和一次首波,同时亦存在着多次波。该区地壳分为七个层次,且由高低速相间的介质组成。地壳的平均厚度为35—36公里,上覆介质的平均速度为6.0公里/秒,上地幔顶部介质的层速度为8.1公里/秒。 该区地壳为不均匀的多层结构,并存在着高速梯度夹层。 文中最后给出了地壳和上地幔顶部的综合速度分布和地壳模型。
In order to study the deep crustal structure of the Central part of North China Plain,a profile of deep seismic sounding has been made.This profile starts from Yuanshih Hsien(元氏县),Hopei Province,at its west end and Tsinan,Shantung Province at its east end.The total length is about 270 km.On the profile are 9 shooting points,constituting a continuous system of observations by correlative meeting and pursuing recording.Based on the kinematic and dynamic characteristics of the waves,we can recognize many primary reflected and head waves,together with multiple reflected waves.In this region,the crust can be divided into seven layers of alterate higher and lower velocities.The overage thickness of the crust is 35-36 km.The overlying material has an average velocity of 6.0 km/sec,while the layer velocity of the top of upper mantle is 8.1 km/sec.In this region,the crust is composed of an inhomogeneous medium of many layers.It consists of intercalated layers of high velocity gradients.Finally,it is given here the velocity distribution in the crust and in the upper mantle together with a model of the crust.
作者
滕吉文
冯炽芬
李金森
陈学波
闻昆娣
张家茹
熊成君
TENG CHI-WEN;FENG CHIN-FEN;LI KIN-SUN;CHEN HSUEH-PO;WEN KUN-TI;CHANG KIA-JU;HSING CHENG-CHUN
出处
《地球物理学报》
1974年第4期255-271,共17页
Chinese Journal of Geophysics
