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《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:

39

期数:

2016年04期

页码:

527-536

栏目:

出版日期:

2016-10-30

文章信息/Info

Title:

Discussion about Several Issues on Dien Bien Phu Fault & North-South Seismic Belt

作者:

张建国¹; 丁志峰²

(1.云南省地震局,云南 昆明 650224; 2.中国地震局地球物理研究所,北京 100081)

Author(s):

ZHANG Jianguo¹; DING Zhifeng²

(1.Earthquake Administration of Yunnan Province,Kunming 650224,Yunnan,China)(2.Institute of Geophysics,CEA,Beijing 100081,China)

关键词:

南北地震带;  奠边府断裂;  古陆核;  侧向挤出;  低速带

Keywords:

North-south seismic belt;  Dien Bien Phu Fault;  craton;  lateral extrusion;  low velocity zone

分类号:

P315.2

DOI:

-

摘要:

纵贯中国大陆的南北地震带以其巨大规模和频繁的大震活动而长期备受关注,然而它延向何方?终止于何处?原因是什么?这些问题关乎能否全面、完整地了解南北地震带大震活动的特征,进而能否不断深化对南北地震带大震活动动力学过程与机理的认识。处于南北地震带南段的中国—东南亚毗邻区,展布着一系列与大震活动相关的大型走滑断裂带,跨越中国、越南、老挝和泰国国境的奠边府断裂就是其中之一。以往国内外对奠边府断裂的关注和研究相对较少,但以鲜水河—小江—奠边府断裂为外边界,围绕东喜马拉雅构造结存在大规模顺时针旋转运动的现象被揭示以来,关于奠边府断裂的地位、作用及其与小江断裂、红河断裂的关系等问题吸引了越来越多的关注。从区域大地构造基本格局的形成与演化、晚新生代活动的运动学与动力学特征、浅表运动状态与深部介质性质等方面,本文对与奠边府断裂相关的研究动态和进展进行了综述,结合以往相关研究的积累,认为奠边府断裂可能是南北地震带的南端边界。

Abstract:

The North-South Seismic Belt(NSSB)distributed through the mainland China have been paid a great deal of attention for a long term because of its huge scale and very frequent activity of big earthquake.However,where does the NSSB extend and end?Why?All of these questions concern the more important issues such as the possibility to understand the features,the geodynamic process and mechanism of big earthquake in the NSSB better.On the other hand,there are a series of large scale strike-slip active faults in the border area between mainland China and Southeast Asia,the southern segment of NSSB,such as Dien Bien Phu Fault.The survey and study related to Dien Bien Phu Fault were no so much in the past at home and abroad,but more and more attention has been attracted to the issues such as the status,the role of the Dien Bien Phu Fault,the possible relationships among the Dien Bien Phu Fault,Red River Fault and Xiaojiang Fault since the phenomenon of the large scale clockwise rotation movement and deformation around the Eastern Himalayan Syntaxis revealed by GPS observation that take the Xianshuihe-Xiaojiang-Dien Bien Phu Fault system as outer limitation.Based on the review on the studies about the formation and evolution of regional geotectonic framework,the kinematic and dynamic characters of fault activity in late Cenozoic,and the relation between the active situation on the surface and the medium property in the deep,and combining with the studies accumulated in the past,we proposed that the Dien Bien Phu Fault could be taken as the southern end of the NSSB.

参考文献/References:

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备注/Memo

备注/Memo:

收稿日期:2016-07-24
基金项目:国家国际科技合作专项项目“中国—东南亚毗邻区大震活动地球动力学研究”(2015DFA21260)资助.

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更新日期/Last Update: 2016-10-30