| 鄂尔多斯地块周围的现代地壳应力场 |
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| 引用本文： | 薛宏运,鄢家全.鄂尔多斯地块周围的现代地壳应力场[J].地球物理学报,1984,27(2):144-152. |
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| 作者姓名： | 薛宏运 鄢家全 |
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| 作者单位： | 国家地震局地球物理研究所 |
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| 摘 要： | 根据近十年来区域台网的P波初动方向观测资料,得到了鄂尔多斯地块周围13个分区的综合地震节面解;结合已有的结果进行分析,地块周围确实存在有别于华北地区地壳应力场基本情况的小区域应力场:地块西南边缘的六盘山褶皱带处于北东东向的水平挤压应力状态;地块边缘的断陷盆地处于北西向的水平拉张应力状态,尤其是渭河盆地到临汾盆地的主压应力轴已近于直立;地块西北角和东北角处于北西向的水平拉张与北东向的水平挤压共同作用的应力状态;在地块的西面与北面,从北到南和由西往东,主压应力轴的走向由北北东向逐渐转变为近东西向。 此外,还对本文结果在板内动力学中的意义进行了简要的讨论。
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| 关 键 词： | 地壳应力场 鄂尔多斯地块 综合节面解 主压应力轴 地震 褶皱带 断裂活动 主张应力 六盘山 小震 |
| 收稿时间： | 1982-04-08 |
THE CONTEMPORARY CRUSTAL STRESS FIELD AROUND THE ORDOS BLOCK |
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| XUE HONG-YUN,YAN JIA-QUAN.THE CONTEMPORARY CRUSTAL STRESS FIELD AROUND THE ORDOS BLOCK[J].Chinese Journal of Geophysics,1984,27(2):144-152. |
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| Authors: | XUE HONG-YUN YAN JIA-QUAN |
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| Institution: | Institute of Geophysics, State Seismological Bureau |
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| Abstract: | The present study gives the synthetic seismic nodal plane solutions for 13 separate areas surrounding the Ordos block on the basis of the last 10 year of obserations of P wave onsets available from the regional seimic network. There indeed exist some locally small crustal stress fields different from that of the North China region. The Liupanshan folded zone, southwest edge of the block, is under the compression of the NEE horizontal stress field; the faulted basins in the margins of the block are acted by the NW horizontal tensional stress field, especially the principal compressional stress axis from the Weihu basin to the Linfen basin is almost vertical; the northwest and northeast corners of the block are under the joint action of the NW horizontal tensional and NE horizontal compressional stress fields; in the West and the north of the Ordos block, the strikes of the principal compressional stress axes from north to south and west to east, turn gradually from NNE to nearly EW direction.A brief discussion is made on the importance of the results obtained in this study in intraplate dynamics. |
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