【摘要】 2006年6月21日甘肃文县5.0级地震的地震序列余震发育,判定为主震-余震型。之前该地区100多年中强地震平静;震前一年ML3.0以上地震频次增高、地震连发;震前一月ML3.0地震活动平静。没有孕震空区和条带存在。更多还原

【Abstract】 In the earthquake sequence of Wenxian MS5.0 event on Jun.21,2006,in Gansu province,the aftershocks were rich,so the type of shock is mainshock-aftershock sequence.No moderate or strong earthquakes occurred in 100 years before the event,but ML≥3.0 events had increased and occurred one after another with groups in one year before the mainshock.Until one month before,the seismic activity went quiet.No seismic gap and belt is formed.更多还原