【摘要】 利用周边国家天山地震目录、中国天山地震目录及USGS地震目录,对天山地震带强震活动的时、空分布特征进行了分析讨论。结果表明,在研究时段内,天山地震带的强震在空间分布上有西强东弱、西密东疏且在40°<φN<42°范围出现强震的空白区并存在特殊的易发震地区。强震在南、北天山之间有往复迁移的特征,并在迁移的过程中有单发—双发—群发,但未出现过单发迁移后出现群发的过程。在时间分布上有较明显的周期特征及南、北天山交替发生的特征。在强度上,7级以上地震主要沿天山构造带分布,而6级地震不但有沿天山分布的还有沿斜切天山带的次级构造分布的,且6级以上地震出现高频地区,集中在东经77°±1°的天山地区。更多还原

【Abstract】 The Tienshan earthquake catalogue of peripheral countries,China and USGS were used to analyze the temporal and spatial distribution characteristics of strong earthquake activity in Tienshan seismic belt.The results showed the strong earthquake activity in Tienshan seismic belt appeared "powerful in the West and weak in the East","dense in the West and sparse in the East" in local area and there was a strong seismic gap in the 40°<φN<42°area and formed a latent earthquake region.The strong earthquakes migrated to and fro between north and south Tienshan and appeared single-double-cluster,never appeared "cluster" after migration of "single".There was obvious periodic characteristic or alternating between north and south Tienshan in time distribution.Most MS>7 earthquakes distributed along Tienshan structural belt,while MS>6 earthquakes distributed not only along Tienshan structural belt,but the secondary structure zone angle cutting Tienshan,and MS>6 earthquakes gathered in λE 77°±1°area of Tienshan.更多还原