青海可可西里地区的活动构造与地震
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摘要
青海可可西里地区是青藏高原腹地，自有仪器记录以来，共发生Ｍｓ≥６．０级地震８次，是海省中强地震的主要发震场所之一。本文根据对青海可可西里地区活动断裂的野外考察，较为详细地研究了该区五条活动断裂的几何形态、空间分布及动力学特征。对该区地震活动与构造应力场的关系进行了探讨。结果表明：青海可可西里地区的活动断裂为继承性全新世活动断裂，多发育着史前和现代地震破裂形变带，是该区的主要发震断裂。其中乌兰乌拉湖─岗齐曲活动断裂带是现代地震的主要发震断裂，地表出露有１９８８年４月５日唐古拉Ｍｓ＝７．０级地震的破裂形变带，长达９公里。通过对可可西里地区的野外考察，未发现国外报道的１９７３年７月１６日青海可可西里地区火山活动的事实。
Kekexili area of Qinghai province is in hinterland of Qinghai-Xizang Plateau, eight earthquakes occurred there since the beginning of recorded earthquake by instrument. It is major one of seismo-genie place of medium-strong earthquake in Qinghai province.Based on the field survey of active fault in Kekexili of Qinghai, the geometric shape. spatial distribution and kinetic characteristics of five active faults was detailed studied,the relationship between seismicity and tectonic stress field was approached in this paper. The results shdw that: the active faults of Kekexili in Qinghai are succession in Holocene and have prehistorical and recent seismic repture deformation zones, are major triggering seismic fault, in it, Wulanwulahu-Gangqiqu active fault is major triggering seismic fault of recent earthquake and has 9km long repture deformation of Tanggula earthquake with Ms=7.0 on April, 5, 1988.Through field survey, the author didn' t find volcanic activity on July, 16, 1973 was reported by abroad.
Kekexili area of Qinghai province is in hinterland of Qinghai-Xizang Plateau, eight earthquakes occurred there since the beginning of recorded earthquake by instrument. It is major one of seismo-genie place of medium-strong earthquake in Qinghai province.Based on the field survey of active fault in Kekexili of Qinghai, the geometric shape. spatial distribution and kinetic characteristics of five active faults was detailed studied,the relationship between seismicity and tectonic stress field was approached in this paper. The results shdw that: the active faults of Kekexili in Qinghai are succession in Holocene and have prehistorical and recent seismic repture deformation zones, are major triggering seismic fault, in it, Wulanwulahu-Gangqiqu active fault is major triggering seismic fault of recent earthquake and has 9km long repture deformation of Tanggula earthquake with Ms=7.0 on April, 5, 1988.Through field survey, the author didn' t find volcanic activity on July, 16, 1973 was reported by abroad.
引文
［1］青藏高原构造演化，地质出版社，北京，1990［2］N．E．古宾．松田时颜，活断层研究，地震出版社，北京，1983［3］常承法，青藏高原碰撞后构造与上尔其－伊朗高原比较（I），地震地质译丛，第8卷，第2期［4］陈国星等，阿尔金断裂东段第四纪活动的时空特征，中国地震，第3卷，增刊，1987［5］何永年等，古地震微观标志研究及其意义，中国地震，第1卷，第3期，1985［6］杨主恩，活断层活动相对年代的一种新判别方法－断层泥中石英碎砾的显微风化形貌测定法，地震地质译丛，第7卷，第1期，1985［7］叶洪等，喜马拉雅弧形山系及其邻近地区现代构造应力场分析，地质科学，NO．1，1975［8］刘增乾等，青藏高原大地构造与形成演化，地质出版社，北京，1990［9］李吉均等，青藏高原隆起的时代幅度和形式的探讨，中国科学，第6期，1979［10］张诚等，中国地震震源机制，学术书刊出版社，北京，1990
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