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2012年6月30日新疆新源—和静MS6.6地震发震构造初步研究

DOI: 10.6038/cjg20140211, PP. 449-458

Keywords: 新源—和静MS6.6地震,地震精定位,震源机制解,震源深度,发震构造

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Abstract:

2012年6月30日新疆维吾尔自治区新源—和静县交界发生MS6.6地震,该地震是2010年青海玉树7.1级地震和2013年4月20日四川芦山7.0级地震之间中国大陆发生的最大的地震.本文基于新疆数字地震台网记录的此次地震序列震相资料,分别用绝对和相对定位方法联合对其进行重新定位,重新定位后余震展布为NW向,主震位置为43.429°N,84.755°E,深度为21.8km.基于新疆地震台网记录6.6级地震波形数据,本文用CAP方法反演了震源机制解和震源深度.结果显示:MS6.6地震震源机制解:节面Ⅰ走向39°,倾角46°,滑动角12°,节面Ⅱ走向301°,倾角81°,滑动角135°;震源深度为21km,与利用地震震相到时确定的主震震源深度基本一致.主震震源机制解的节面Ⅱ与伊犁盆地北缘断裂走向和倾角基本一致,综合精确定位余震展布和伊犁盆地北缘断裂性质分析认为,新源—和静MS6.6地震发震构造是伊犁盆地北缘断裂,震源深度为21km左右,是一个高角的内陆倾滑地震.

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