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| 岷山断块的发震构造与地震活动性分析 | |
| 引用本文： | 万森林,张军龙,刘明军,贺为民,李海龙,郭长宝,李智敏.岷山断块的发震构造与地震活动性分析[J].地震,2020,40(2):49-70. |
| 作者姓名： | 万森林 张军龙 刘明军 贺为民 李海龙 郭长宝 李智敏 |
| 作者单位： | 1.中国地震局地震预测研究所, 北京 100036; 2.中国地震局地球物理勘探中心, 河南 郑州 450002; 3.中国地质科学院地质力学研究所, 北京 100081; 4.青海省地震局, 青海 西宁 810001 |
| 基金项目： | 国家自然基金项目(41372215, 41174078, 41872223); 中国地质调查局项目(DD20160271); 地震行业专项(201408023); 山西省联合研究基金项目(2012012003); 地震科技星火计划攻关项目(XH19060); 青海省科技计划项目(2017-ZJ-775) |
| 摘 要： | 岷山断块位于中国南北强震构造带的中段, 区域地质构造复杂, 活动断裂众多, 强震频发。 4条不同走向的活动断裂NE向龙门山构造带的茂汶断裂、 NWW向东昆仑断裂带的塔藏断裂、 近NS向的岷江断裂和NNW—NS向的虎牙断裂构成岷山断块的南北西东边界。 638—2017年该区域共发生了10次6级以上破坏性地震, 2017年九寨沟7.0级地震就是其中之一。 结合区域构造背景, 对岷山断块所发生的6级以上地震的发震构造特征、 地震活动特性进行归纳总结, 综合分析该区域地震地质特征及地震危险性, 得出以下认识: ① 地震分布空间分区特征显著, 破坏性强震发震构造多为活动性较强的岷山断块东西边界断裂, 震中位置多位于两组或多组活动断裂构造的交会或穿切部位; ② 地震分布时间特征表现为随着时间发展具有迁移回返和原地复发性等特点; ③ 岷山断块东西边界断裂破坏性地震的发生具有一定的时间关联性, 东边界虎牙断裂1973—2017年的地震序列为西边界岷江断裂1933—1960年地震序列约40年后的地震构造响应; ④ 未来岷山断块仍应是继续关注的强震潜在危险区, 岷江断裂中北段的强震潜在危险区是近期值得深入研究的地区之一。 |
| 关 键 词： | 岷山断块 地震活动性 地震关联性 巴颜喀拉块体 青藏高原 |
| 收稿时间： | 2019-06-15 |
Seismogenic Structure and Seismic Activity Analysis of Minshan Block |
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| WAN Sen-lin,ZHANG Jun-long,LIU Ming-jun,HE Wei-Min,LI Hai-long,GUO Chang-bao,LI Zhi-min.Seismogenic Structure and Seismic Activity Analysis of Minshan Block[J].Earthquake,2020,40(2):49-70. | |
| Authors: | WAN Sen-lin ZHANG Jun-long LIU Ming-jun HE Wei-Min LI Hai-long GUO Chang-bao LI Zhi-min |
| Institution: | 1.Institute of Earthquake Forecasting, CEA, Beijing 100036, China; 2.Geophysical Exploration Center, CEA, Zhengzhou 450002, China; 3.Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China; 4. Qinghai Earthquake Agency, Xining 810001, China |
| Abstract: | The Minshan block is located in the middle of South-North Seismic Structural Belt in China with complex regional geological structures, numerous active faults and frequent strong earthquakes. Maowen fault, Tazang fault, Minjiang fault and Huya fault are the main active faults in different directions constitute the boundary of the Minshan block. From 638 to 2017, 11 powerful earthquakes of magnitude 6 or above occurred in this region, and the 2017 Jiuzhaigou MS7.0 earthquake is one of them. Based on the regional tectonic background, this paper summarizes the structural characteristics and seismicity characteristics of strong earthquakes occurring in Minshan block.and comprehensively analyses the seismogeological characteristics and seismic hazards in this area. It is concluded that: ① The spatial distribution of earthquakes is characterized by obvious zoning, the most destructive strong earthquake generating structures are the East-West boundary fault areas of Minshan block with strong activity, and the epicenter is located at the intersection or cutting position of two or more groups of active fault structures. ② the temporal distribution of earthquakes is characterized by migration and return and in-situ recurrence with the development of time. ③ The occurrence of destructive earthquakes along the East-West boundary of Minshan block has a certain time correlation. The seismic sequence of Huya fault in the east boundary from 1973 to 2017 is the seismic structural response of Minjiang fault in the west boundary from 1933 to 1960 about 40 years later. ④ Minshan block should be the potential danger area of strong earthquake in the future, and the potential dangerous area of strong earthquakes in the north-central section of Minjiang fault is the area worthy of further study in the near future. |
| Keywords: | The Minshan block Seismicity Seismic correlation The Bayan Har block The Tibetan Plateau |
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