| 天水-礼县地区地壳速度结构 |
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| 引用本文： | 李清河,闵祥仪,郭建康,魏德晴,侯晓钰.天水-礼县地区地壳速度结构[J].西北地震学报,1990,12(2):49-58. |
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| 作者姓名： | 李清河 闵祥仪 郭建康 魏德晴 侯晓钰 |
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| 作者单位： | 国家地震局兰州地震研究所
(李清河，闵祥仪，郭建康，魏德晴)，国家地震局兰州地震研究所(侯晓钰) |
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| 摘 要： | 1984—1985年,利用厂坝铅锌矿工业爆破,在天水—礼县地区布设测线进行了大范围的地震测深工作。对该地区的地壳速度结构的研究结果表明,该地区沉积层平均厚度为2.5km,速度为4.0km/s(P波);地壳平均厚度为43.68km,平均速度为6.20km/s;徽县—礼县地壳速度剖面可分为5层,其中在24—29km深处有一低速层,基底深度变化较大,在礼县地壳浅部发现一断层。对天水—礼县地区还进行了P波、S波联合反演,获得了该区P波与S波速度结构,其地壳范围内的平均波速比为1.73。
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| 关 键 词： | 地壳 速度 结构 爆破 地震波 |
| 收稿时间： | 1988/9/19 0:00:00 |
THE CRUSTAL VELOCITY STRUCTURE IN TIANSHUI-LIXIAN REGION |
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| Li Qinghe,Min Xiangyi,Guo Jiankang,Wei Deqing and Hou Xiaoyu.THE CRUSTAL VELOCITY STRUCTURE IN TIANSHUI-LIXIAN REGION[J].Northwestern Seismological Journal,1990,12(2):49-58. |
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| Authors: | Li Qinghe Min Xiangyi Guo Jiankang Wei Deqing and Hou Xiaoyu |
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| Institution: | Earthquake Research Institute of Lanzhou, SSB, Gansu, China,Earthquake Research Institute of Lanzhou, SSB, Gansu, China,Earthquake Research Institute of Lanzhou, SSB, Gansu, China,Earthquake Research Institute of Lanzhou, SSB, Gansu, China and Earthquake Research Institute of Lanzhou, SSB, Gansu, China |
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| Abstract: | The line has twice laid out to sound the crustal velocity structure in Huixian-Lixian region by means of industrial blasts of Changba Lead-Zinc Mine in 1984 and 1985, especially, the explosion of 500 ton charge on Dec. 30, 1985 supports us to interprete a large scope crustal velocity structure. The parts of DSS data obtained by DSS Cooperation Group, SSB, in 1986 were supplemented.The velocity structure in Tianshui-Lixian region are following:1.The average thickness of sedimentary layer is about 2.5km, average velocity is 4km/s (P-wave).2.The average thickness of crust is 43.6km, average velocity is 6.2km/s.3.There are five layers from surface to Moho. There is a low-velocity layer in depth 24-29 km. The shape of base is rising and falling.A fault in Lixian was found.4.The joint inversion of P-wave and S-wave was put forward, and P-wave velocity structure and S-wave velocity structure were obtained, The average velocity ratio of crust is 1,732, |
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