2014年新疆于田M_S7.3地震序列特征及早期趋势判断

Characteristics of Seismic Sequence and Early Tendency Judgment for Yutian M_S7. 3 Earthquake in 2014

介绍了2014年2月12日新疆于田MS7.3地震的基本参数、发震构造和地震序列特征,并与2008年于田MS7.3地震序列特征进行对比分析。结果显示,2014年于田MS7.3地震有MS5.4直接前震,序列强余震频次低、余震衰减较快,目前最大余震震级为MS5.7;通过分析历史地震序列类型、计算于田单台序列的h值、b值、主震释放的能量与序列能量的比值等参数,初步判断于田MS7.3地震序列为"前震—主震—余震型"。

The basic parameters, seismogenic structure and seismic sequences characteristic of Yutian Ms7.3 earthquake on Feb. 12, 2014 are introduced, and are compared with Yutian Ms7. 3 earthquake in 2008. The results show that the Ms5.4 earthquake is regarded as an immediate foreshock of Yutian Ms7.3 main shock. The frequency of strong aftershock sequences was low and the number of them declined quickly, the maximum aftershock is Ms5.7 earthquake. According to analyzing the historical earthquake sequence type, and parameter of hvalue, b-value and energy release ratio between main shock and sequence etc. , we got the preliminary conclusion which is the type of Yutian Ms7.3 earthquake sequence in 2014 belongs to foreshock-main shock-aftershock type.