| 2022年青海门源地震震源机制与同震滑动分布研究 |
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| 引用本文： | 于 仪,李 雪,孙 振,刘珠妹,张朝阳.2022年青海门源地震震源机制与同震滑动分布研究[J].大地测量与地球动力学,2023,43(1):46-51. |
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| 作者姓名： | 于 仪 李 雪 孙 振 刘珠妹 张朝阳 |
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| 摘 要： | 采用Sentinel-1A卫星提供的升降轨雷达影像数据研究门源地震同震形变及震源机制。首先利用合成孔径雷达差分干涉（D-InSAR）技术获得门源地震的同震形变场；然后以升降轨同震形变场为源数据，利用弹性半空间位错模型进行反演，确定地震的断层几何参数和滑动分布；最后基于同震滑动模型对升降轨同震形变场进行正演。结果表明，沿雷达视线方向的升轨和降轨同震形变场最大抬升形变量分别为39 cm和58 cm，最大沉降形变量均为56 cm。此次门源地震为左旋走滑型地震事件，发震断层方向为NWW-SEE、走向为109°、倾角为86°，主要集中在地下2~6 km处，最大滑动量为4.2 m，释放的地震距为8.22×1018 Nm（MW6.6）。正演结果表明，本文滑动分布模型准确可靠。
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| 关 键 词： | 青海门源地震 D-InSAR 同震形变场 震源参数 断层滑动分布 |
Investigation on Focal Mechanism and Coseismic SlipDistribution for Menyuan Earthquake in 2022 |
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| YU Yi,LI Xue,SUN Zhen,LIU Zhumei,ZHANG Chaoyang.Investigation on Focal Mechanism and Coseismic SlipDistribution for Menyuan Earthquake in 2022[J].Journal of Geodesy and Geodynamics,2023,43(1):46-51. |
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| Authors: | YU Yi LI Xue SUN Zhen LIU Zhumei ZHANG Chaoyang |
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| Abstract: | Adopting the radar image of ascending and descending orbit provided by Sentinel-1A satellite, we study the coseismic deformation and focal mechanism of Menyuan earthquake. Firstly, based on D-InSAR technology, we obtain the coseismic deformation field of Menyuan earthquake. Then, taking the coseismic deformation field of ascending orbit and descending orbit as source data, we inverse fault parameters and slip distribution using the Okada uniform elastic semi-infinite dislocation model. Finally, the coseismic deformation field is forward modelled based on the coseismic sliding model. Experimental results show the maximum uplift deformations of ascending and descending coseismic deformation field along the radar line of sight are 39 cm and 58 cm, respectively. The maximum subsidence deformations of ascending and descending coseismic deformation field along the radar line of sight are all 56 cm. The earthquake is a left-handed strike-slip seismic event. The fault strikes along the NWW-SEE direction with the strike of 109° and dip of 86°. The maximum slip of 4.2 m, which is mainly concentrated in the underground 2 to 6 km. The released seismic distance of this earthquake is 8.22×1018 Nm(MW6.6). The forward results verify that the sliding distribution model is accurate and reliable. |
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| Keywords: | Menyuan earthquake in Qinghai D-InSAR coseismic deformation field focal parameter fault slip distribution |
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