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  沙海军,吕悦军,黄帅.2017年九寨沟7.0级地震断层破裂尺度初步研究[J].震灾防御技术,2018,(4):921-930, DOI:10.11899/zzfy20180419.

2017年九寨沟7.0级地震断层破裂尺度初步研究
摘要:    本文利用2017年九寨沟7.0级地震的余震序列数据,结合震源机制解确定的地震断层面,研究了地震断层的破裂尺度。基于余震序列在断层面上的投影,分析直接余震和间接余震以及不同起始震级条件下余震区的长度和震源深度分布,估算了地震断层破裂面的破裂长度和破裂深度,并探讨了地震断层破裂对地震烈度分布的影响。研究结果显示,九寨沟7.0级地震断层的破裂长度约33—35km,破裂深度约23—26km;地震断层破裂对Ⅷ度区分布有明显的控制作用,地震断层破裂长度接近Ⅷ度区的长度。
作者单位
沙海军 中国地震局地壳应力研究所, 北京 100085 
吕悦军 中国地震局地壳应力研究所, 北京 100085 
黄帅 中国地震局地壳应力研究所, 北京 100085 
关  键  词:九寨沟地震  地震断层  破裂尺度  余震序列
DOI:10.11899/zzfy20180419
基金项目:中国地震局地壳应力研究所基本科研业务费专项(ZDJ2017-14),北京自然科学基金项目(8174078)和国家自然科学基金项目(51708516)共同资助
收稿日期:2018-04-28
作者简介:沙海军,男,生于1976年。副研究员。主要从事地震活动性模型、地震危险性分析等方面的研究。E-mail:shjshare@163.com
通讯作者:
Preliminary Study of Fault Rupture Scale of the 2017 Jiuzhaigou MS 7.0 Earthquake
Abstract:      Using the aftershock sequence data of the Jiuzhaigou MS 7.0 earthquake in 2017 and the earthquake fault plane determined by the focal mechanism solution, the rupture scale of the earthquake fault was studied. Based on the projection of the aftershock sequence on the fault plane, the distribution of the length and focal depth of the aftershock zones under different initial magnitude conditions is analyzed for the direct and indirect aftershocks, the rupture length and rupture depth of the fault plane of the earthquake were estimated. Finally, the influence of earthquake fault rupture on the distribution of earthquake damage was discussed. The results show that the rupture length of Jiuzhaigou earthquake is about 33-35km, and the rupture depth is estimated to be 23-26km. The rupture of earthquake fault has significant control over the distribution of the Ⅷ degree zone, and the rupture length of the earthquake is close to the length of the Ⅷ degree zone.
Keywords:  The Jiuzhaigou earthquake  Earthquake fault  Rupture scale  Aftershock sequence
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