四川长宁地区宽频带数字近震记录特征
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摘要
通过对2008年1月至2013年10月四川省长宁地区ML≥3.5的20个近震重新进行分析后发现,在ML≥4.0时,该地区近震面波发育,ML震级略大于MS震级;100~160 km以内的部分台站即可清晰记录到上地壳绕射波Pb,也可清晰记录到下地壳反射波Pm P;在研究时间段内,该地区仅发生1次ML≥5.0地震,用波形记录测定出有两个不同的破裂点。
According to the seismic phase observation data of 20 near earthquakes of ML≥3. 5 occurred in Changning area,Sichuan Province,between January 2008 and October 2013,we summarize the law of seismic wave phases. In Changning area the seismic surface wave of near earthquakes are rich and the seismic magnitude determined from the body wave is slightly larger than the magnitude determined from surface wave. The seismic waves Pm P refracted from the upper crust and lower crust interfaces are observed clearly by stations located within radius range from 100 to 180 km. During the study period,only one ML≥5. 0 earthquake occurred in the area,two epicenters were determined by the seismic wave form recording.
引文
[1]中国地震局监测预报司.实用数字地震分析[M].北京:地震出版社,2009.
    [2]中国地震局监测预报司.地震学与地震观测[M].北京:地震出版社,2007.
    [3]阮祥,程万正,张永久,等.四川长宁盐矿井注水诱发地震研究[J].中国地震,2008,24(3).
    [4]朱元清,佟玉霞,于海英,等.数字化台网的近震震相自动识别[J].西北地震学报,2002,24(1):5-12.
    [5]王海军,靳平,刘贵忠,王晓明.区域震相初至估计[J].西北地震学报,2003,4(2).
    [6]吴建平,黄媛,张天中,等.汶川Ms8.0级地震余震分布及周边区域P波三维速度结构研究[J].地球物理学报,2009,52(2).
    [7]王卫民,赵连锋,李娟,等.四川汶川8.0级地震震源过程[J].地球物理学报,2008,51(5).

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