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玛沁-兰州-靖边地震测深剖面地壳速度结构的初步研究
引用本文:李松林,张先康,张成科,赵金仁,成双喜.玛沁-兰州-靖边地震测深剖面地壳速度结构的初步研究[J].地球物理学报,2002,45(2):210-217.
作者姓名:李松林  张先康  张成科  赵金仁  成双喜
作者单位:中国地震局地球物理勘探中心,郑州450002
基金项目:国家重点基础研究专项经费资助项目 (G1 9980 4 0 70 2 ),中国地震局地球物理勘探中心论著号 : RCEG2 0 0 1 0 3
摘    要:为研究青藏高原块体和鄂尔多斯地块间的相互作用和构造变形的深部驱动机制,布设了1000km长的玛沁-兰州-靖边综合地球物理探测剖面.本文只介绍由人工地震观测资料所得到的初步结果.地壳分层性明显,以C界面为界,总体上可分为上、下地壳两大部分,每个部分又包含一些次一级的界面;横向变化的总趋势是从东北至西南地壳逐渐变厚,地壳厚度的变化主要由下地壳厚度的变化所引起;地壳平均速度,总的变化趋势是自东北向西南逐渐降低,其中在泽库以西和海原地区的速度值明显偏低;在泽库以西存在多个壳内低速层,在海原附近存在一个低速层;壳内反射界面,沿测线由东北至西南逐步增多;从地震反射波形来看,在海原地区Pc波非常强,且延续时间长;另外,在海原地区和泽库以西地区Pm波的复杂性系数很大,远远大于其他地段的值.以上结果表明,泽库以西地区和海原地区地壳-上地幔存在着明显结构异常,反映了巴颜喀拉地块和柴达木地块、祁连地块和鄂尔多斯地块间的相互作用

关 键 词:地震测深  地壳结构  玛沁-兰州-靖边剖面.``  
文章编号:0001-5733(2002)02-0210-08
收稿时间:2000-12-05

A PRELIMINARY STUDY ON THE CRUSTAL VELOCITY STRUCTURE OF MAQIN-LANZHOU-JINGBIAN BY MEANS OF DEEP SEISMIC SOUNDING PROFILE
LI SONG,LIN,ZHANG XIAN,KANG,ZHANG CHENG,KE,ZHAO JIN,REN,CHENG SHUANG,XI.A PRELIMINARY STUDY ON THE CRUSTAL VELOCITY STRUCTURE OF MAQIN-LANZHOU-JINGBIAN BY MEANS OF DEEP SEISMIC SOUNDING PROFILE[J].Chinese Journal of Geophysics,2002,45(2):210-217.
Authors:LI SONG  LIN  ZHANG XIAN  KANG  ZHANG CHENG  KE  ZHAO JIN  REN  CHENG SHUANG  XI
Institution:Research Center of Exploration Geophysics, CSB, Zhengzhou 450002, China
Abstract:A 1000km long comprehensive geophysical profile was deployed along Marqin-Lanzhou-Jingbian for studying interaction between the Qinghai Xizang plateau block and the Ordos block and for studying the deep driving mechanism of tectonic deformation. A preliminary result is presented in this paper on the basis of deep seismic sounding (DS) data. The crust is clearly stratified. On the whole, it can be divided into two parts, i.e. the upper crust and the lower crust. Each on the two parts contains a number of secondary interfaces. The crust becomes gradually thicker from northeast to southwest mainly due to the variation in the depth of the lowr crust. The average crustal velocity becomes gradually lower from northeast to southwest-velocity is obviously low in the west of Zeku and in Haiyuan region. A number of low velocity layers exist in the west of Zeku, and another low velocity layer exists near Haiyuan. The number of reflecting horizons increases gradually from northeast to southwest. As seismic reflection waveform shows, Pc wave is very strong and lasts long at Haiyuan. Besides, the complexity coefficients of Pm wave in Haiyuan and in the west of Zeku are, much larger than those in other parts. The above results clearly show that anomalous structures exists in the crust and upper mantle in the west of Zeku and in Haiyuan region, which reflects the interaction between BayanHar block and Chaidamu block as well as between Qilian block and Ordos block.
Keywords:Deep seismic sounding  Crustal structure  Maqin-Lanzhou-Jingbian profile
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