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陕西地区地壳厚度初探
引用本文:姜家兰,黄长林. 陕西地区地壳厚度初探[J]. 地震工程学报, 1986, 8(4): 43-51
作者姓名:姜家兰  黄长林
作者单位:陕西省地震局(姜家兰),陕西省地震局(黄长林)
摘    要:本文利用陕西测震台网记录到的七次人工爆破与邻区10个中强地震资料,利用由莫霍界面的首波P_n的走时数据,采用改进的时间项法[1]和相对时间项法[3][4]计算了各测点的时间项b_j和v_(pn),最后得出40个测点的地壳厚度。陕西地区地壳厚度的总趋势是东面较薄,西面较厚。陕北地壳较厚,约为41~43公里,陕南秦岭断块地区地壳厚度约为40公里,而渭河盆地地壳较薄,平均约为36公里。研究结果表明,地壳深部结构与地震活动存在着一定的联系。

收稿时间:1985-02-13

A PRELIMINARY STUDY ON THE CRUSTAL THICKNESS IN SHANXI REGION
Jiang Jialan and Huang Changlin. A PRELIMINARY STUDY ON THE CRUSTAL THICKNESS IN SHANXI REGION[J]. China Earthguake Engineering Journal, 1986, 8(4): 43-51
Authors:Jiang Jialan and Huang Changlin
Affiliation:Seismological Bureau of Shaanxi Province and Seismological Bureau of Shaanxi Province
Abstract:From the data of 7 artificial explosions and 10 moderate strong earthquakes of nearby regions recorded by the Shaanxi Seismic Network and also the data of head wave pn from Moho, the time-term bi and vpn for each observation spot and the crustal thickness beneath 40 observation sots are determined by use of the improved time-term method[1] and relative time-term method[3],[4]. Generally speaking, the crustal thickness in Shaanxi region is thinner in the east and thicker in the west. The crust in northern Shaanxi is relatively thick, about 41-43kin. For faulted regions in the Qinling Mountains, it is about 40 kin. The crust in the weihe Basin is relatively thin, about 36 km on ae average. The results suggest that there exist a certain relation between deep crustal structure and seismic activity.
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