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| 西宁盆地浅层滑脱面与地震关系探讨 | |
| 引用本文： | 张军龙,田勤俭,李智敏,任治坤,郝凯.西宁盆地浅层滑脱面与地震关系探讨[J].地震,2008,28(1):114-120. |
| 作者姓名： | 张军龙 田勤俭 李智敏 任治坤 郝凯 |
| 作者单位： | 1.中国地震局地震预测研究所, 北京 100036; 2.中国地震灾害防御中心, 北京 100029; 3.青海省地震局, 青海 西宁 810001 |
| 基金项目： | “郯庐断裂带中段走滑活动与地震”项目 |
| 摘 要： | 滑脱面空间特征的研究可以反映次级浅断裂与区域深断裂之间的构造关系, 在西宁盆地中, 第三纪地层在NNE向区域挤压应力作用下, 沿近NW向发生弯曲褶皱变形。 利用平衡剖面方法, 通过对垂直构造走向的一条剖面进行反演, 得到西宁盆地的滑脱面深度在4~5 km, 并向南倾, 与物探资料得到的盆地沉积盖层的底界位置和形态基本相同。 因此得出盆地沉积盖层的变形方式以柔皱褶曲为主, 并沿沉积盖层底界进行滑脱。 同时根据区域地震背景分析, 认为在西宁盆地浅滑脱的结构面不具备强震的发震条件。 |
| 关 键 词： | 西宁盆地 滑脱面 平衡剖面 次级断裂 |
| 文章编号： | 1000-3274(2008)01-0114-07 |
| 收稿时间： | 2007-06-12 |
| 修稿时间： | 2007年6月12日 |
The relationship between detachment surface and seismicity in Xining basin |
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| ZHANG Jun-long,TIAN Qin-jian,LI Zhi-min,REN Zhi-kun,HAO Kai.The relationship between detachment surface and seismicity in Xining basin[J].Earthquake,2008,28(1):114-120. | |
| Authors: | ZHANG Jun-long TIAN Qin-jian LI Zhi-min REN Zhi-kun HAO Kai |
| Institution: | 1. Insititute of Earthquake Science, CEA, Beijing 100036; 2. China Earthquake Disaster Prevention Center, Beijing 100029; 3. Earthquake Administration of Qinghai Province, Xining 810001, China |
| Abstract: | The space features of the detachment surfaces show the tectonic connection between the shallow secondary faults and the regional deep faults.In the Xining basin,the Tertiary stratum deformation occurs along the direction of NW under action of the regional compressional stress along the direction of NNE.With the balanced profile technology,we draw a conclusion that the detachment surfaces in Xining basin is located at depth of 4~5 kilometers beneath the surface,and inclines towards south,the same result is obtained from the physical exploration data.We consider that the deformation pattern of the sediment cover in the basin is mainly folded,and surges along the bottom of the sediment cover.Based on the analysis above,it is concluded that the shallow detachment surfaces in Xining basin has no background for the strong shock occurrence. |
| Keywords: | Xining basin Detachment surface Balanced profile Secondary faults |
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