摘要
基于约束条件下最小二乘原理及最速下降法,采用最小二乘配置拟合后的震间期GPS速度场作为约束,对安宁河—则木河断裂断层面滑动分布进行了反演。研究结果表明:由GPS资料计算所获取的断层面滑动分布,与地震地质研究中得到的断层面凹凸体分布具有较好的一致性,即安宁河断裂(西昌至冕宁以北)闭锁深度较深,强震危险性较大;而则木河断裂闭锁深度较浅,近期发生强震的可能性较小。
Based on the least squares principle with constraint conditions and the steepest descent method(SDM),the slip distribution on the fault plane was inversed along Anninghe-Zemuhe fault plane using the interpolated GPS velocity field from observation by the least squares principle.The results indicate that it is consistent between the fault plane slip and the location of asperity defined by seismic geological research.The locking depth of the Anninghe fault(Xichang to the north of Mianning)is big,with a high seismic risk.However,for the Zemuhe fault,the locking depth is small,with a low seismic risk in the short-term.
作者
朱良玉
蒋锋云
ZHU Liangyu;JIANG Fengyun(The Second Crust Monitoring and Application Center,China Earthquake Administration,Xi an 710054,Shaanxi,China)
出处
《地震研究》
CSCD
北大核心
2018年第3期354-360,共7页
Journal of Seismological Research
基金
中国地震局地震科技星火计划--基于InSAR的东昆仑断裂玛沁玛曲段地震危险性分析(XH17059)
汶川地震对川滇地区震后影响与观测异常研究(XH16058Y)
国家自然科学基金--基于三维地壳形变研究黄河断裂灵武段现今活动状态(41604015)
山西省科技攻关项目--基于InSAR技术的山西地震重点监视防御区现今地壳形变场监测与研究(20140313023-1)联合资助
