| 云南通海盆地的浅层速度结构 |
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| 引用本文： | 何正勤,胡刚,鲁来玉,张维,叶太兰,沈坤.云南通海盆地的浅层速度结构[J].地球物理学报,2013,56(11):3819-3827. |
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| 作者姓名： | 何正勤 胡刚 鲁来玉 张维 叶太兰 沈坤 |
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| 作者单位： | 1. 中国地震局地球物理研究所, 北京 100081;2. 中国地震局地震观测与地球物理成像重点实验室, 北京 100081;3. 中石油集团川庆钻探工程有限公司, 成都 610051;4. 云南省玉溪市防震减灾局, 云南玉溪 653100 |
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| 基金项目： | 中国地震局地球物理研究所基本业务费专项“通海—江川盆地浅层速度结构探测”(DQJB11C13);地震行业科研专项“中国地震科学台阵探测——南北地震带南段”(201008001)共同资助 |
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| 摘 要： | 为了研究通海盆地的地震动场地效应,在强地面运动的数值模拟计算中需要提供该地区的浅层速度结构模型.为此,在通海盆地开展了10 km高分辨率反射地震勘探和30个测点的面波联合勘探工作.综合本次探测结果与褐煤普查中的电测深和钻孔资料,得到了通海盆地的基岩埋深分布图.结果表明,在通海盆地中部,新生界厚度为100~300 m,整体表现出西南厚东北薄的趋势,盆地沉积层厚度变化明显受到小江断裂南段分支断裂的控制.浅层速度随深度分布表现出在深度相同的情况下,盆地边缘的速度高于盆地中部.
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| 关 键 词： | 通海盆地 地震勘探 面波勘探 速度结构 |
| 收稿时间： | 2013-04-16 |
The shallow velocity structure for the Tonghai basin in Yunnan |
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| HE Zheng-Qin,HU Gang,LU Lai-Yu,ZHANG Wei,YE Tai-Lan,SHEN Kun.The shallow velocity structure for the Tonghai basin in Yunnan[J].Chinese Journal of Geophysics,2013,56(11):3819-3827. |
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| Authors: | HE Zheng-Qin HU Gang LU Lai-Yu ZHANG Wei YE Tai-Lan SHEN Kun |
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| Institution: | 1. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;2. Key Laboratory of Seismic Observation and Geophysical Imaging, CEA, Beijing 100081, China;3. Chuanqing Drill Engineering Company, CNPC, Chengdu 610051, China;4. Earthquake Disaster Mitigation Bureau of Yuxi, Yunnan Yuxi 653100, China |
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| Abstract: | In order to study the site effect on the ground motion in Tonghai basin, the model with shallow layer velocity structure must be provided for the simulation of strong ground motion. To this end, reflection surveys with high resolution along 10 km profile combined with the surface wave exploration at 30 observations are carried out in Tonghai basin. Integrating the existing data from borehole and electrical sounding performed before for lignite prospecting, the depth distribution of the bedrock is figured out by analyzing the measured data. Results show that the thickness of Cenozoic is 100~300 m in the centre of the basin and exhibit an overall trend of thick in southwest and thin in northeast. The variation of the sediment thickness is apparently controlled by the branch fault in the south of Xiaojiang fault. The shallow layer velocity at the edge of the basin is larger than that in the centre for the same depth. |
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| Keywords: | Tonghai basin Seismic exploration Surface wave exploration Velocity structure |
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