【摘要】 2003年4月17日青海省德令哈市西北发生6.6级地震。该地震发生在具有强烈活动特征的大柴旦—宗务隆山断裂带上,震前地震活动表现出明显的大面积ML4级地震平静,而震中附近则同时出现了高频次、高GL值异常以及ML3级地震平静—活跃、ML4级地震平静等异常现象。对省内及甘肃省前兆观测资料进行追踪分析,认为震前有4项前兆测项呈现出中期和短期异常特征。更多还原

【Abstract】 Delingha Ms6.6 earthquake occurred on April 17,2003 in Qinghai province in Dacaidan-Zongwulong fault which is more active,but no ML4 earthquakes in this large area before the event,and in the epicenter,it appeared more anomalies,such as high frequency,high GL value,ML3 earthquakes from quiet to active and no ML4 earthquakes.According to the provincial and neighboring areas(Gansu province) data,there were four precursory observation items appeared middle-term and short-term anomalies before the event.更多还原