地震研究

采用D-InSAR技术得到2018年云南墨江MS5.9地震的同震形变场,以此为约束,利用SDM程序反演同震形变场和发震断层面的滑动分布,并讨论了此次地震的发震构造。结果表明:墨江地震造成地表LOS向最大形变量约为6 cm,同震形变场呈对称分布。发震断层以右旋走滑运动为主,符合区域构造的运动性质。断层面的最大滑动量为0.19 m,大约分布在沿断层走向10～13 km、且沿倾向向下3～6 km处。断层在近地表处滑动量较小,同震错动未破裂至地表。

Taking the coseismic deformation of Yunnan Mojiang MS5.9 earthquake in 2018 obtained from D-InSAR technology as a constraint,we inversed the slip distribution of the fault plane along the region tectonic by the steepest descent method(SDM)and discussed the seismogenic structure of the earthquake. The results indicate that the maximum deformation in LOS-trending caused by the Mojiang earthquake is about 6 cm,and the distribution of co-seismic deformation field is symmetrical. The seismic fault is dominated by right-lateral slip,which is consistent with the dextral tectonic movement background of the regional tectonic. The largest slip achieves 0.19 m,which is distributed about 10～13 km along the fault strike and 3～6 km down along the dip direction. The slip of fault near surface is small,and the coseismic displacement does not break to the surface.

引言
1 构造背景
2 D-InSAR同震形变结果
3 断层滑动反演及发震构造讨论
4 结论

表1 墨江MS5.9地震参数<br/>Tab.1 Parameters of MS5.9 MoJiang earthquake

表1 墨江MS5.9地震参数
Tab.1 Parameters of MS5.9 MoJiang earthquake

图1 2018墨江MS5.9地震区域构造背景<br/>Fig.1 Tectonic setting of epicenter region for 2018 Mojiang MS5.9 earthquake

图1 2018墨江MS5.9地震区域构造背景
Fig.1 Tectonic setting of epicenter region for 2018 Mojiang MS5.9 earthquake

表2 SAR卫星数据参数<br/>Tab.2 Parameters of SAR images

表2 SAR卫星数据参数
Tab.2 Parameters of SAR images

图2 2018年墨江MS5.9地震同震形变场与均匀滑动反演结果<br/>Fig.2 Coseismic deformation and uniform slip inversion of 2018 Mojiang MS5.9 earthquake

图2 2018年墨江MS5.9地震同震形变场与均匀滑动反演结果
Fig.2 Coseismic deformation and uniform slip inversion of 2018 Mojiang MS5.9 earthquake

图3 2018年墨江MS5.9余震序列总体展布(a)与其在NE向(b)及NW向(c)的展布<br/>Fig.3 The distribution of aftershock sequence(a)and its distribution along the NW(b)and NE(c)directions

图3 2018年墨江MS5.9余震序列总体展布(a)与其在NE向(b)及NW向(c)的展布
Fig.3 The distribution of aftershock sequence(a)and its distribution along the NW(b)and NE(c)directions

表3 2018年墨江MS5.9地震断层参数及其标准误差<br/>Tab.3 Fault parameters and their standard deviation for 2018 Mojang MS5.9 earthquake

表3 2018年墨江MS5.9地震断层参数及其标准误差
Tab.3 Fault parameters and their standard deviation for 2018 Mojang MS5.9 earthquake

图4 粗糙度与拟合残差关系<br/>Fig.4 Relationship between the roughness of the slip model and the model misfit with SAR data

图4 粗糙度与拟合残差关系
Fig.4 Relationship between the roughness of the slip model and the model misfit with SAR data

图5 2018年墨江MS5.9地震同震形变场降采样数据与分布式滑动反演<br/>Fig.5 Coseismic deformation down sampling data and model for the distributed slip inversion of 2018 Mojiang MS5.9 earthquake

图5 2018年墨江MS5.9地震同震形变场降采样数据与分布式滑动反演
Fig.5 Coseismic deformation down sampling data and model for the distributed slip inversion of 2018 Mojiang MS5.9 earthquake

图6 2018年墨江MS5.9地震同震断层面滑动分布<br/>Fig.6 Slip distribution of co-seismic fault surface for 2018 Mojiang MS5.9 earthquake

图6 2018年墨江MS5.9地震同震断层面滑动分布
Fig.6 Slip distribution of co-seismic fault surface for 2018 Mojiang MS5.9 earthquake

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备注

引言

1 构造背景

2 D-InSAR同震形变结果

3 断层滑动反演及发震构造讨论

4 结论

期刊信息