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利用区域宽频带数据反演鲁甸MS6.5级地震震源破裂过程

DOI: 10.6038/cjg20140927, PP. 3028-3037

Keywords: 鲁甸地震,区域宽频带数据,有限断层,破裂过程

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Abstract:

基于有限断层模型反演方法,我们利用区域宽频带数据反演得到了2014年8月3日鲁甸MS6.5级地震的震源破裂过程.反演结果显示:此次地震的发震断层走向为北北西向,破裂主要以左旋走滑为主,位移主要发生在震源左上方,最大滑动量为0.7m,模型显示断层破裂可能接近地表,破裂长度约10km.此次地震释放的标量地震矩为1.97×1018N·m,相当于矩震级为Mw6.1,地震能量主要在前15s释放.鲁甸地震有四个显著的特点:(1)位移主要集中在浅部,从11km起破点开始迅速向上传播,大部分位于10km以上且最大位移位于深度3km处,从模型来看,破裂可能接近地表,因此地表震动较为强烈;(2)应力降比较大,计算显示释放的同震静态应力降约为2.8MPa;(3)破裂速度较快,在地表附近超过了2.5km·s-1;(4)主震可能发生在一个共轭断层系上.这四个特点可能是导致此次地震造成如此重大人员伤亡和财产损失的最重要的原因.

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