新疆中强地震序列特征参数与主震震级的统计关系

系统分析了1970~2007年间新疆境内70个5级以上地震序列的余震持续时间和余震区长轴与主震震级的统计关系,以及主震破裂方式对余震时空特征参数的影响。研究结果表明,新疆及分区地震带余震持续时间和余震区长轴分别与主震震级弱相关,主震震级较低时两者关系离散,震级较高时则呈线性增强。不同的地震带这种线性关系存在差异,对于相同的主震震级,天山地震带余震持续时间一般大于西昆仑地震带,而余震区长轴前者小于后者。新疆地区主震破裂方式对余震的持续时间影响不大,但对余震区长轴影响较大,走滑型主震余震区长轴一般大于逆断型地震。

STATISTICAL RELATION BETWEEN THE CHARACTERISTIC PARAMETERS OF MID-STRONG EARTHQUAKES SEQUENCE AND THE MAIN SHOCK MAGNITUDE

The author analyzed aftershock lasting time,the long axis of aftershock area and main shock magnitude of 70 M≥5earthquake sequences systematically,the mainshock failuremode influencing the time-space characteristic parameters.The result showed that there was weak correlation between the aftershock lasting time,the long axis of aftershock area and main shock magnitude in Xinjiang and different areas.As the magnitude becomes bigger,the linear relation strengthens and it is different in different earthquake belts.When the main shock magnitude doesn＇t change,the aftershock lasting time in Tianshan mountain earthquake belt is longer than that of west Kunlun mountain earthquake belt and the long axis of aftershock area smaller than the latter.The main shock failuremode doesn＇t affect the aftershock lasting time,but affect the long axis of aftershock area seriously.