Steel moment - resisting frames with welded beam - to - column connections were traditionally regarded as having excellent performance , and widely adopted in steel constructions , but this opinion changed after the 1994 northrige earthquake and the 1995 hyogoken - nanbu earthquake . these earthquakes also arouse engineers to resurvey the behavior of end - plate connections 传统观点认为，梁柱焊接刚性连接具有较好的抗震性能，因此在工程中得到了广泛地应用，但1994年的northrige地震和1995年的阪神地震改变了这种传统观点，这两次地震也引起了工程技术人员对端板连接的再审视。
There are two important questions : one is what is the properties of the seismicity before the earthquake , the other is about the character of the aftershock sequence . the completeness of the catalogue of earthquakes with magnitude over 3 . 0 can be confirmed by different independent tests such as minimum magnitude distribution , frequency - magnitude distribution and the rydelek - sacks test 本文用最低震级分布、震级频度分布和rydelek - sacks检验等方法分析了格尔木单台、青海省地震台网和格尔木台阵记录到的本次地震的余震序列，确认余震的记录对于m _ l3 . 0级以上的地震是完整的。
Using the arrival times of 197 earthquakes well recorded by the beijing seismic network and the china - germany cooperative yanqing digital seismic array in the period from october of 2001 to december of 2005 , we accurately relocate these earthquakes by the joint - inversion program for hypocentralr position and 3 - d velocity structure 摘要利用首都圈地震台网和中德合作延庆数字地震台阵2001年10月2005年12月获得良好记录的197次地震到时，运用地震震源位置和三维地壳速度结构联合反演程序对这些地震实行精确定位。
