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日本M9.0级巨震对山东地区地壳活动的影响研究

DOI: 10.6038/cjg20130508, PP. 1497-1505

Keywords: 日本地震,山东地区,GPS,运动轨迹,沂沭断裂带

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Abstract:

以山东地壳运动GPS观测网为基础,结合周边IGS提供的全球GPS观测资料,计算了2011年3月11日发生的日本9.0级巨震对山东所处地块产生的影响,并给出了该地区站点的真实运动轨迹和运动方式.结果显示:山东各GPS基准站受地震波影响产生的震时最大振幅超过0.2m,持续时间约160s;同震位移方向为东东南向,位移量最大超过10mm.日本9.0级地震对山东所在地块的影响主要是在水平方向,对垂直方向影响不大,它对山东主要断裂带-沂沭断裂带起到了拉张的作用,且N段幅度明显大于S段.根据地震前后站点时间序列的发展趋势来看,近期山东所处地块处于向西回调运动状态,推测震后3~5个月左右将恢复到震前的轨迹,为本地区的震情判定提供了可靠依据.

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