新疆天山主要活断层的分段及其在地震区划中的运用

STUDY ON THE MAIN ACTIVE FAULT DIVISION AND ITS APPLICATION TO SEISMIC REGIONALIZATION

对天山地区活动断裂不同地段的几何形态、运动方式、地震活动特征存在的差异进行了分析研究。提出了活断层分段的标准和几种用于活断层分段的地震活动性指标:给出了活断层分段的标志点特征,并对新疆天山地区13条活断层进行了分段,讨论了分段结果在地震区划潜在震源区划分及其地震活动性参数确定中的应用。结果表明:通过活断层分段使潜在震源区的划分更准确、恰当,使地震活动性参数的确定更能反映出地震活动的时空不均匀性。

After analyzing the geometric patterns,motion modes,and difference of the seismic features for different active faults at each segment in Tianshan area, the normalization for the active fault division and some indexes of the seismicity in use have been put forward, indicating the key feature of active fault division. While in the mean time the author made a division for thirteen active faults in Tianshan and a discussion on its result applying to seismic regionalization, potential sources determination and seismicity parameters making. Finally, the results showed that through the division of the active faults,we can make the work in focal sources determination more correct and suitable, and the work of the parameters making in reflecting the inhomogeneity of seismicity in time and space more desirable.