2022年9月5日四川省甘孜州泸定县发生MW 6.6地震，利用国家烈度速报与预警工程项目建成的基本站强震动数据，使用迭代反褶积和叠加法（IDS）进行破裂过程反演。反演所得破裂模型显示，破裂面呈NNW—SSE走向，破裂持续时间为15 s，分为4个阶段：首个阶段发生在震后3 s，破裂朝着断层面上倾方向以及SE侧传播；第二阶段为震后6—9 s，破裂继续向SE侧传播并在震中SE侧10 km处迅速加剧，此时破裂滑动速率达到峰值；第三阶段在震后9—12 s，破裂能量继续在SE侧释放，破裂滑动速率逐渐减小，破裂静态滑动累积量达到峰值并趋于稳定；第四阶段在震后12—15 s，破裂能量基本释放完毕，破裂结束。整个破裂由震中向SE方向延伸，由深部向浅部扩展。最大破裂点位于震中SE向10 km附近地下5 km处，最大滑动量为0.8 m，破裂可能出露地表。
On September 5, 2022, an MW 6.6 earthquake occurred in Luding County, Ganzi Prefecture, Sichuan Province. We used the strong motion data of the basic stations built by the National System for Fast Seismic Intensity Report and Earthquake Early Warning Project to carry out an inversion for the rupture process using the iterative deconvolution and stacking method (IDS). The inverted rupture model shows that the rupture plane is in an NNW-SSE trend and the rupture duration is 15 s, which is divided into four stages. The first stage occurred 3 s after the earthquake, and the rupture propagated towards the up-dipping direction of the fault plane and the southeast side. The second stage is 6 to 9 s after the earthquake. The rupture continued to propagate to the southeast and intensified rapidly at 10 km to the southeast of the epicenter. At this time, the rupture slip rate reached its peak. In the third stage, 9 to 12 s after the earthquake, the rupture energy continued to release in the southeast, the rupture slip rate gradually decreased, and the accumulated amount of rupture static slip reached the peak and became stable. In the fourth stage, 12 to 15 s after the earthquake, the rupture energy is basically released and the rupture is over. The whole rupture extends from the epicenter to the southeast and from deep to shallow. The maximum rupture point is located 10 km southeast of the epicenter and 5 km underground. The maximum sliding amount is 0.8 m. The rupture may be exposed to the surface.
2022,43（5）: 186-192 收稿日期：2022-09-28
DOI：10.3969/j.issn.1003-3246.2022.05.023
基金项目：中国地震局地震应急青年重点任务（项目编号：CEA_EDEM-2022）
作者简介：戴丹青(1990-),男,工程师,主要从事地震预警运维和震源破裂过程研究工作。E-mail:daidanqing@seis.ac.cn
*通讯作者：孙丽(1983-),女,高级工程师,主要从事地震速报预警方法研究与台网管理工作。E-mail:sunli@seis.ac.cn
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