| 鄂尔多斯地块周缘地区构造活动与应变积累特性研究 |
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| 引用本文： | 张希,贾鹏,张四新,李瑞莎.鄂尔多斯地块周缘地区构造活动与应变积累特性研究[J].大地测量与地球动力学,2018,38(4):331-337. |
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| 作者姓名： | 张希 贾鹏 张四新 李瑞莎 |
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| 作者单位： | 中国地震局第二监测中心 |
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| 摘 要： | 利用截至2016年底、约30 a的跨断层短水准流动观测资料，借助灰色关联度垂向综合指标提炼、年变速率与趋势累积率计算，分析鄂尔多斯地块周缘地区构造活动特性、水平及时空差异，以及与研究区内中强以上地震、区外大震孕育-发生或影响的关系。结果表明：1)断裂活动特性总体上与地质资料一致。2)研究区内MS5.8以上地震及区外汶川大震震前多出现异常。3)垂向断裂活动较快的是渭河盆地西部、六盘山构造区北部；较慢的是渭河盆地中部、海原断裂、六盘山构造区南部。山西断陷带、西秦岭构造区北部长期能量积累明显；六盘山构造区至渭河盆地西部两端活动、中间相对闭锁，尤其近几年。
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| 关 键 词： | 鄂尔多斯地块周缘 跨断层短水准 构造活动 应变积累 灰色关联度指标 |
Study on the Characteristics of Tectonic Activities and Strain Accumulation at the Surroundings of Ordos Block |
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| ZHANG Xi,JIA Peng,ZHANG Sixin,LI Ruisha.Study on the Characteristics of Tectonic Activities and Strain Accumulation at the Surroundings of Ordos Block[J].Journal of Geodesy and Geodynamics,2018,38(4):331-337. |
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| Authors: | ZHANG Xi JIA Peng ZHANG Sixin LI Ruisha |
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| Abstract: | Based on about 30 years mobile cross-fault short leveling data for at the surroundings of Ordos block up to the end of 2016, we compute the vertical synthetic norm of grey relation degree, annual velocity and trend accumulation rate.We analyze the characteristics, level and time-space differences of the tectonic activities. Furthermore, we consider possible relationships with the gestation-occurrence and the influence of strong earthquakes inside the monitoring area and great earthquakes outside the monitoring area. The results showed that: (1) the characteristics of fault activity are basically consistent with the geological data; (2) anomalies are found inside and outside the study area before most earthquakes with magnitude over Ms5.8 and the Wenchuan great earthquake; (3) vertical tectonic activitiesare faster in the western Weihe basin and the northern Liupanshan tectonic region, while slower in the central Weihe basin, the Haiyuan fracture and the southern Liupanshan tectonic region. Long-term energy accumulation is relatively obvious in Shanxi fault belt and the northern west Qinling tectonic region. Both ends are relatively active, while the center locked from Liupanshan tectonic region to the western Weihe basin, particularly in recent years. |
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| Keywords: | surroundings of Ordos block cross-fault short leveling tectonic activity strain accumulation grey relation norm |
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