| 滇西北下关跨断层场地形变异常调查与机理分析 |
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| 引用本文： | 李腊月,薄万举,陈宗时,邵德盛,陆明勇,王晓强.滇西北下关跨断层场地形变异常调查与机理分析[J].大地测量与地球动力学,2019,39(1):77-83. |
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| 作者姓名： | 李腊月 薄万举 陈宗时 邵德盛 陆明勇 王晓强 |
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| 作者单位： | 中国地震局第一监测中心,天津市耐火路7号,300180;中国地震局第二监测中心,西安市西影路316号,710054;云南省地震局,昆明市北辰大道148号,650041;中国地震应急搜救中心,北京市玉泉西街1号,100049;新疆维吾尔自治区地震局,乌鲁木齐市科学二街388号,830011 |
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| 基金项目： | 中国地震局三结合课题;中国地震局地震科技星火计划;国家科技基础性工作专项 |
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| 摘 要： | 对滇西北下关跨断层场地形变异常进行实地调研和考察，分析原始观测曲线，计算断层水平扭错、水平张压和垂直升降相对变化的累积量，讨论形变异常机理。结果表明： 1）下关场地观测点位稳定，观测环境较好，无人为破坏或干扰现象，场地观测数据连续可靠；2）下关场地跨断层观测反映的断层背景活动方式为右旋活动，近期有所增强；3）下关场地断层形变中的压性异常波动与周边中强震、远场大地震有一定的对应关系；4）跨断层基线得到的水平张压累积量显示，地表断层存在持续的拉张活动，水准得到的垂直升降累积量显示，断层存在持续压性(逆断)活动,二者可以在统一的机理下得到解释,这对解释跨断层场地观测中存在的大量矛盾现象具有重要的参考价值。
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| 关 键 词： | 下关场地 异常调查 形变异常 断层活动参数 形变机理 |
Investigation and Mechanism Study of Deformation Anomaly of Xiaguan Fault Site in Northwest Yunnan Province |
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| LI Layue,BO Wanju,CHEN Zongshi,SHAO Desheng,LU Mingyong,WANG Xiaoqiang.Investigation and Mechanism Study of Deformation Anomaly of Xiaguan Fault Site in Northwest Yunnan Province[J].Journal of Geodesy and Geodynamics,2019,39(1):77-83. |
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| Authors: | LI Layue BO Wanju CHEN Zongshi SHAO Desheng LU Mingyong WANG Xiaoqiang |
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| Abstract: | In this paper, on-the-spot investigation and inspection is carried out for the fault deformation anomaly on Xiaguan site, northwest Yunnan province, and the original observation curves are analyzed. Furthermore, the accumulation of 3 parameters: the relatively horizontal torsion, the relatively horizontal movement and the relatively vertical variation of the fault, are calculated respectively; and the mechanism of deformation anomalies is discussed. The results are: (1) the observation position of the Xiaguan site is stable, the observation environment is good, there is no artificial disturbance or interference phenomenon, and the observation data is continuous and reliable; (2) the cross-fault observation of the Xiaguan site shows the fault has been being active as a right lateral slip, which has been enhanced recently; (3) there is a corresponding relationship between the abnormal compressional fluctuation of the fault deformation and strong earthquakes in the surrounding area; (4) the accumulation of horizontal compressional deformation from baselines across the fault shows that there is constant surface tensional fault activity. The accumulation of relative vertical deformation of the fault from leveling shows that the fault has a persistence of compressional fault (inverse) activities, and both can be explained under the mechanism of unity, which is of important reference value to explain the large number of contradictory phenomena in the observation of the cross-fault site. |
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| Keywords: | Xiaguan site anomaly investigation deformation anomaly parameters of fault activity deformation mechanism |
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