新疆天山地区强震前地震条带不清晰的原因初探
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
新疆地区在强震前地震条带不明显。本文对比分析了新疆天山与川滇地区区域构造背景和地震震源机制解,得到:①新疆天山地区区域地震构造以逆冲型为主,而川滇地区区域地震构造以走滑型为主。②1970年以来的天山地区中强地震以逆断层和走滑型地震类型为主,走滑型地震多数包含较大的倾滑分量;而川滇地区6级强震以走滑型地震类型为主,地震主要以水平错动为主。认为弱震条带适用于以水平剪切错动为主的地震,而新疆天山地区地震倾滑分量较大,因此中强地震前弱震条带图像不清晰,中短期地震预报意义不显著。
The seismic belt before mid-strong earthquakes in Xinjiang Region is not clear.For this problem,the regional structure background and focal mechanism solutions of Tianshan Mountain area in Xinjiang are contrasted and analyzed with that in Sichuan and Yunnan provinces.The result shows: ① The regional earthquake structures in Tianshan Mountain area are mainly thrust faults,while ones in Sichuan andYunnan area are mainly strike-slip faults.② Since 1970,the focal mechanism solutions of mid-strong earthquakes were mainly reverse and strike-slip types in Tianshan Mountain area,and most of the strike-slip events contained lean components.While ones of MS6 strong earthquakes area were mainly the strike-slip types in Sichuan and Yunnan area,and the lean component were very small,mainly showed horizontal movement.The weak seismic belts should be applied to earthquakes which are horizontal shear movement in focal mechanism solution.Since the lean components of earthquakes were big in Tianshan Mountain area,the images of the seismic belt before mid-strong earthquakes were vague,and its significance for the earthquake forecast of mid-short term is not good.
引文
[1]刘蒲雄,陈章立.地震条带及其在地震预报中的应用[A]∥地震预报方法实用化研究文集(地震学专辑)[G].北京:学术书刊出版社,1989:63-84.
    [2]韩渭宾,席敦礼.四川地区地震活动条带预报效能的研究[A]∥地震预报方法实用化研究文集(地震学专辑)[G].北京:学术书刊出版社,1989:85-99.
    [3]周传荣,孙志昆.地震的条带分布[A]∥地震预报方法实用化研究文集(地震学专辑)[G].北京:学术书刊出版社,1989:100-110.
    [4]国家地震局科技监测司.地震学分析预报方法程式指南[M].北京:地震出版社,1990.
    [5]梅世蓉,冯德益,张国民,等.中国地震预报概论[M].北京:地震出版社,1993.
    [6]王海涛,杨立明,马文静,等.西北地区强地震短期前兆特征和预测方法研究[M].北京:地震出版社,2006.
    [7]邓起东,冯先岳,张培震,等.天山活动构造[A]∥中国活断层研究[G].北京:地震出版社,2000.
    [8]苏有锦,秦嘉政.川滇地区强地震活动与区域新构造运行的关系[J].中国地震,2001,17(1):24-34.
    [9]新疆通志.地震志,第十一卷[M].新疆:新疆人民出版社,2002.
    [10]苏乃秦.新疆北天山MS5.0地震前的中长期地震活动空间图像特征[J].内陆地震,2002,16(3):224-234.
    [11]王金周,刘文龙,陈宇卫,等.地震空区及条带附近地震破裂特征的震例研究[J].西北地震学报,2002,24(2):167-173.

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心