【摘要】 根据龙门山构造带上的跨断层水准测量资料,计算了龙门山断裂带1986年至2008年1月的垂直活动速率、断层形变异常强度及测线的月变化率,研究了龙门山断裂带1986至2008年初的异常变化。结果表明,龙门山断裂带的垂直活动速率不大,在1 mm/a以下。但是在大震发生前的1～3 a,断层活动加速,在形变异常强度图上变化显著,在月变率统计图上,也有明显的异常。龙门山断裂带的断层形变异常对于南北地震带上600余公里以内的3次7级以上大震均有反映,对本区的地震反映更明显。更多还原

【Abstract】 Based on the cross-fault leveling data in Longmenshan tectonic belt,we calculated the vertical activity rates of Longmenshan fault zone within 1986-2008,anomaly intensities of fault deformation and monthly variation rates of the survey line and studied the anomalies of Longmenshan fault zone within 1986-2008.The result shows that the vertical activity rates of Longmenshan fault zone are not high and below 1mm/a,however,during one to three years before the large MS8.0 earthquake,the fault activity was increasing,which exhibited remarkable changes on the anomaly intensities of deformation and monthly variation rates.Three big earthquakes with magnitude larger than MS7 which occurred within 600km of the North-South seismic belt are reflected by the anomalies of fault deformations of Longmenshan fault zone,and the reflection is more noticeable when earthquakes occurred locally.更多还原