2016门源6.4级地震前祁连山—海原断裂的活动速率反演  

Inversion of fault slip rate before the 2016 Menyuan 6.4 magnitude earthquake

作　　者：柳新强 王燕 胡泊 Liu Xinqiang;Wang Yan;Hu Bo(Shaanxi Railway Institute,Weinan 714099,China;Weinan Urban and Rural Planning Surveying and Mapping Service Center,Weinan 714000,China;Yellow River Conservancy Vocational and Technical College,Kaifeng 475003,China)

机构地区：[1]陕西铁路工程职业技术学院,陕西渭南714099 [2]渭南市城乡规划测绘服务中心,陕西渭南714000 [3]黄河水利职业技术学院,河南开封475003

出　　处：《工程勘察》2018年第9期49-52,共4页Geotechnical Investigation & Surveying

基　　金：陕西省高等教育教学改革研究项目(17GY022);陕西铁路工程职业技术学院科研基金项目(KY2016-47)

摘　　要：利用青藏高原东北缘1999~2013年的GPS观测速率,基于负位错模型,采用粒子群算法,反演计算了2016门源6.4级地震前祁连山—海原断裂的滑动速率和闭锁速率。结果显示,祁连山断裂整体北向逆冲伴有较小的左旋走滑速率,平均挤压速率超过3mm/a。海源断裂整体左旋走滑为主,兼有一定挤压运动,左旋速率达3~4mm/a左右,挤压速率相对较小,不到2mm/a。祁连山断裂在倾向方向上锁定速率明显,达到2mm/a以上,区域在2016门源6.4级地震前呈较强的闭锁程度。海原断裂在走滑方向均上有较明显锁定速率,达1~2mm/a,具备发生走滑型地震的背景条件。Using GPS observations in the northeastern margin of the Tibetan Plateau during 1999 ~ 2013 and particle swarm optimization method, the fault slip rate of Qilianshan-Haiyuan fault and block movement rate before the 2016 Menyuan 6. 4 magnitude earthquake are inversed based on negative dislocation model. The results show that Qilianshan fault mainly thrusts to the north with smaller sinistral slip,the average rate of extrusion is more than 3 mm/a. Haiyuan fault is mainly with sinistral movement,the left slip rate is up to about 3 ~ 4 mm/a,and the extrusion rate is relatively small,less than 2 mm/a.Qilianshan fault in the dip direction locking rate is significant,reaching more than 2 mm/a,shows a strong degree of regional lock before the 2016 Menyuan 6. 4 earthquake. There is an obvious locking rate,up to1 ~ 2 mm/a,in the strike direction of Haiyuan fault,presents a background conditions for the occurrence of strike slip earthquake.

关 键 词：负位错模型 粒子群算法 GPS 

分 类 号：P315[天文地球—地震学]