华莹山断褶带地震活动的新特点及内因初探
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摘要
华莹山断褶带的地震活动在中国的地震活动进入第Ⅴ个活跃幕以来非常活跃 ,频次高 ,强度大 ,与四川西部地区连续 11年无 Ms6 0级以上强震形成鲜明对比。其地震活动呈现 6个新特点 :第一 ,频次增高、强度增大 ;第二 ,地震活动有从北向南逐步迁移的特点 ;第三 ,华莹山断褶带的地震活动多双震或震群型 ;第四 ,华莹山断褶带上的地震活动都有较明显的震兆异常 ;第五 ,震级都有逐步增大 ,直接达到或超过历史地震最高水平的过程 ;第六 ,与川滇南北地震带的强震活动有较强的呼应关系。这些新特点既与华莹山断褶带的断裂力学性质有关 ,又与印度板块向北俯冲亚洲板块的方向、力度、角度改变有关。部分地区如宜宾、荣昌等地震活动非常活跃 ,与当地采气注水也有一定关系。
The Huayingshan fault fold belt is very active since the fifth active period in China earthquake history.The seismic frequency and intensity in these regions are higher than that in western regions of Sichuan.Six new characteristics about Huayingshan fault areas are summarized:1 High frequency and intensity.2 earthquakes migrate from north to south.3 Earthquakes appeared mainly as swarms.4 There were obvious seismic abnormal before earthquake.5 The seismic magnitude becomes bigger and bigger and finally reaches its peak of earthquake history.6 There is a better connection with the strong earthquakes happened in Sichuan-Yunnan block.All these phenomena result from the mechanics of Huayingshan fault fold belt and its direction,intensity and the angle which India plate interpose into Asian plate. Meanwhile the seismic activities in some areas such as Yibing,Rongchang counties may be caused by the nature gas drilling and the injection of water.
引文
[1]国家地震局 .中国地震简目 [M].北京 :地震出版社 ,1997.
    [2 ]罗灼礼 ,韩渭宾 ,等 .四川省地震前兆预报方式实用化研究成果汇编之一 [J].四川地震 ,1989( 3) .
    [3]陈立德 .强震中短期前兆异常的共性特征 [J].地震 ,2 0 0 0 ( 2 ) .
    [4 ]国家地震局科技监测司 .地震学分析预报方式程式指南 [M].北京 :地震出版社 ,1990

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