【摘要】 统计2009年1月1日至2011年10月30日四川青川县内8 000多个M_L≥1.0地震,研究汶川地震后青川县内小震活动的日频次变化和前兆起伏加剧、突跳,与其后48小时内发生的M_L≥4.0中强震的对应关系,结果对青川县中强地震发生时间、空间范围的预报分析有一定意义。更多还原

【Abstract】 In this article the minor earthquakes M_L≥1.0 in Qingchuan during the period from January 2009 to October 2011 was statistically studied.The result indicates that before a main shock of M_L≥4.0,a series of minor events in the 48 hours and distances away from epicenters for the M_L≥4.0 events performance anomaly of daily frequency and premonitory fluctuation aggravation.The results show that the mutual features exist aboard in special,temporal and intensity before the main shock,and they have a practice value for analysis and diagnosis in local earthquake prediction in Qingchuan.更多还原