| 西-海-固地区垂直形变分析及地震趋势研究 |
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| 引用本文： | 张四新,张希,陈兵,薛富平. 西-海-固地区垂直形变分析及地震趋势研究[J]. 地震, 2000, 20(3): 48-52 |
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| 作者姓名： | 张四新 张希 陈兵 薛富平 |
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| 作者单位： | 中国地震局第二地形变监测中心,陕西 西安 710054 |
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| 基金项目： | 中国地震局“九五”科研攻关项目!( 95-0 4 -0 6-0 3 ) |
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| 摘 要： | 通过对西（吉）-海（原）-固（原）地区垂直形变场的演化分析表明:①90年代以来,垂直形变场升降差异运动减弱;②现今青藏亚板块对鄂尔多斯地块西南缘（西-海-固地区） 的 NE 方向挤压应力有所减弱,华北亚板块 SW 方向挤压应力有所加强;③鄂尔多斯块体周缘小震出现的活跃状态,可能是由于青藏亚板块挤压应力的减弱而造成鄂尔多斯块体水平挤压应力场的“失稳”,以及华北亚板块挤压应力相对增强的结果。
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| 关 键 词： | 垂直形变 海原断裂带 地震活动 西-海-固地区 |
| 收稿时间： | 1999-08-17 |
| 修稿时间： | 2000-02-02 |
Analysis of vertical crust deformation and study on the trend of earthquakes in Xiji-Haiyuan-Guyuan area |
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| ZHANG Si-xin,ZHANG Xi,CHEN Bing,XUE Fu-ping. Analysis of vertical crust deformation and study on the trend of earthquakes in Xiji-Haiyuan-Guyuan area[J]. China Earthguake Engineering Journal, 2000, 20(3): 48-52 |
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| Authors: | ZHANG Si-xin ZHANG Xi CHEN Bing XUE Fu-ping |
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| Affiliation: | The Second Crustal Deformation Monitoring Center, CSB, Xi'an 710054, China |
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| Abstract: | By analyzing the evolution of vertical deformation field in Xiji-Haiyuan-Guyuan area,the following results are obtained: ① Since1990,the differential movement of vertical deformation field has decreased.Today,activity of Liupan mountain fault zone is low.② The compressional stress from Qinghai-Tibet sub-plate to the southwestern border of Ordos Massif along NE direction has become weak,but the compressional stress from North China sub-plate along SW direction becomes stronger.③ The reason why appears activity of small earthquakes,may be instability of horizontal stress field of Ordos block,due to adjustment of compressional stress form Qinghai-Tibet plate and relative strengthening of compressional stress from North China sub-plate. |
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| Keywords: | Vertical crust deformation Hai Yuan fault zone Seismicity Xi Hai Gu area |
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