摘要
分析了南天山东段的强震活动时空分布规律及其应变释放特征。结果表明,该区6级以上强震活动具有准周期性,平均时间间隔约10年,且有间隔愈来愈小的趋势。强震活动的空间分布表现为有规律的纬向往返迁移;6级以上地震发生前存在若干年的应变释放加速和中强地震活动增强的预释放时段,并出现明显的背景性地震空区、空段等趋势异常。
The laws of tempral and spatial distribution and the strain release characteristic of strong earthquakes in east part of South Tianshan are analysed in the paper. The result shows: the strong earthquake activity (Ms≥6) in this area has paraperiodicity; The average time interval is about 10 years, and has a tendency of becoming shorter. The spatial distribution of the strong earthquake activity shows that the epicenters migrate in latitude direction with regularity. There are pre-release time interval of strain release acceleration and increasing of medium-strong earthquake activity before occurrence of earthquakes with magnitude over 6 . Meanwhile, the seismic gap and segment and other tendentious anomaly also appear clearly.
出处
《内陆地震》
1991年第2期119-125,共7页
Inland Earthquake
关键词
地震活动性
强震
新疆
南天山地区
East part of South Tianshan Strong earthquake activity Repetition interval Epicenter migration
