摘要
利用邢台地震序列震源机制解反演邢台老震区分时段应力场,并对震源机制和应力场结果进行分析。研究结果显示:邢台老震区的震源错动类型以走滑类型为主,遍布整个震源区;序列整体和3个时段的应力场反演结果基本一致,且与华北地区其他强震的应力方向相同,表明邢台地震的发生受华北区域构造应力场控制;应力场反演得到的邢台地震序列现今的摩擦系数显示处于拜尔利摩擦系数的范围,区域应力方向有利于断层活动,而地震活动频度和强度偏低,推断目前震源区处于某种平衡状态,需要进一步研究震源区深浅应力状态的耦合关系。
In the study, the st ress fields of Xingtai earthquake region in different periods is inversed on ba-sis of focal mechnism solutions of the Xingtai earthquake sequence, the analysis of the ocal mechnism solu-tions and the stress field shows that the earthquake source faults of the Xingtai earthquake sequence are mainly of strike-slip type faults and spread all over the Xingtai earthquake source region. Stress field in-versed using the whole sequence are basically consistent with the stress field that inversed using focal mechanism solutions in 3 periods and also consistent with the stress field direction of other strong earth-quakes in North China area, which indicates that the occurrence of Xingtai earthquake is in the control of the tectonic stress field of North China. Friction coefficient of the Xingtai earthquake sequence inversed in the stress fields are within the limits of the？ Byerlee’s law, regional stress field direction is beneficial to fault activity and the frequency and active intensity of earthquake are relatively low which indicate that, the earthquake source region are in a kind of balance and further study on coupling of stress fields statement of deep crust and that of shallow crust is need.
出处
《华北地震科学》
2017年第1期17-23,共7页
North China Earthquake Sciences
基金
河北省地震局地震科技星火计划重点项目"晋冀蒙交界地区典型盆地孕震动力学模型构建"(DZ20160621076)
关键词
邢台地震序列
震源机制解
应力场反演
摩擦系数
Xingtai earthquake sequence
focal mechanism solution
stress field inversing
friction coeffi-cient
