【摘要】 根据流动台网对九江-瑞昌地震序列的定位结果,采用单台波速比方法,计算各流动台的波速比变化,得出以下结果:①各台波速比存在一定幅度的变化,但变化形态不一致,这可能与震源区应力调整有关;九江台和武蛟台的波速比在2006年4月下中旬至6月中旬这段时间较明显处于低值区间,相应的主余震的M-T图显示余震活动在该段时间内强度和频度有较明显的增强。②沿以武蛟和狮子洞两台连线的NW走向的波速比最小,结合主-余震北西向较优势分布和震源机制解的其中一组NW向节面,推断北西向断裂可能是九江一瑞昌5.7级主震的发震构造。更多还原

【Abstract】 According to the seismic localization result from the mobile observation arrays,the Vp/VS ratios can be calculated by using single station method.The calculation results are shown as follows: ①The Vp/VS ratios from mobile observation arrays vary in a certain extent,but their change tendency is different,this may be relevant to stress adjustment in the seismogenic faults.From mid-April to mid-June in 2006,the Vp/VS ratios of JUJ and WUJ stations are in the lower level,and the seismic activities show obviously enhancement during that time according to the aftershocks M-T chart.②The Vp/VS ratios in the northwest direction along the WUJ to SZD are least.So it is concluded that the fault with northwest strike may be the seismogenic structure of the Jiujiang-Ruichang M5.7 earthquake with the north-west predominated spatial distribution of the earthquake sequence and NW zone from focal mechanism solutions.更多还原