| 唐山滦县震区的三维地震透射研究──中、上地壳速度层析成像 |
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| 引用本文： | 张先康,杨玉春.唐山滦县震区的三维地震透射研究──中、上地壳速度层析成像[J].地球物理学报,1994,37(6):759-766,T002. |
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| 作者姓名： | 张先康 杨玉春 |
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| 作者单位： | 国家地晨局地球物理勘探大队, 郑州 450003 |
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| 摘 要： | 利用布设在唐山滦县震区３０ｋｍ×４０ｋｍ范围内的由８８台数字和模拟地震仪组成的临时台阵，接收来自不同方向６个炮点激发产生的莫霍界面反射波走时，重建了台阵下１-９ｋｍ深度的Ｐ，Ｓ波速度和Ｖｐ／Ｖｓ图像．结果表明。中、上地壳结构存在明显的横向不均匀性．北北东走向的滦县-卢龙断裂自地表向下至少延伸到８ｋｍ深度处，并向北西方向倾斜．中、上地壳存在着近东西向的低速异常条带．这两组构造控制着该区的地震活动．
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| 关 键 词： | 唐山滦县震区 三维地震透射 层析成像 地壳不均匀性 |
| 收稿时间： | 1993-03-19 |
THREE-DIMENSIONAL SEISMIC TRANSMISSION EXPERIMENT IN THE LUANXIAN EARTHQUAKE REGION OF NORTH CHINA:TOMOGRAPHIC DETERMINATION OF THE UPPER AND MIDDLE CRUST STRUCTURE |
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| ZHANG XIAN-KANG,YANG YU-CHUN,ZHAO PING,ZHAO JIN-REN,LUO LI-LEI,WANG CHUN-LIN,SONG JIAN-LI.THREE-DIMENSIONAL SEISMIC TRANSMISSION EXPERIMENT IN THE LUANXIAN EARTHQUAKE REGION OF NORTH CHINA:TOMOGRAPHIC DETERMINATION OF THE UPPER AND MIDDLE CRUST STRUCTURE[J].Chinese Journal of Geophysics,1994,37(6):759-766,T002. |
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| Authors: | ZHANG XIAN-KANG YANG YU-CHUN ZHAO PING ZHAO JIN-REN LUO LI-LEI WANG CHUN-LIN SONG JIAN-LI |
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| Institution: | Geophysical Prospecting Brigade, SSB, Zhengzhou 450003 |
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| Abstract: | A temporary seismic station array,consisting of 88 analogue and digital recorders with three components,was arranged in a 30km×40km region for receiving the PmP and SmS waves reflected from the Moho at the critical distances generated by 6 shots from different azimuths.The travel-time residuals are used for the reconstruction of the P and S velocity structures and Vp/Vs distribution under the seismic array from the depth off km until the depth of 9 km.The results reveal that the velocity structures of the upper and middle crust in this region are laterally heterogeneous.The Lulong fault in NNE strike direction extends downwards at least to the depth of 8 km with northwestward inclination. The strip-shaped low-velocity distribution in EW direction exists in the upper and middle crust of this region.These two tectonic features play a controlling role in the seismicity of this area. |
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| Keywords: | Luanxian earthquake region Three-dimensional seismic transmission Travle-time tomography Hetrogeneity in the crust |
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