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用证实1960年智利大地震存在低频前驱震的方法处理了国际加速度仪布设(IDA)台站的1～6mHz段的数据,以确定近期22个大震和巨震的地震矩和矩心时间。这22个地震包括1989年马阔里海岭地震,据报道,该地震有低频前驱震(Imhlé et al.,1993)。在1～6mHz频段没有发现这些地震明显的前驱震证据。结果显示,给定断层类型的单侧破裂大地震的地震矩大致与持续时间的平方成正比。这个关系能很好地拟合这些数据。
Data from 1 to 6 mHz of the International Accelerometer (IDA) station were processed to confirm the presence of low-frequency pre-seismic shocks in the 1960 Chilean earthquake to determine the seismic moment and centroid time of the recent 22 major and major earthquakes. These 22 earthquakes included the 1989 Marquoll Ridge Earthquake, which was reportedly pre-damped at low frequency (Imhlé et al., 1993). In the frequency band of 1 ~ 6mHz, no obvious precursory shock evidence of these earthquakes was found. The results show that the seismic moment of a large unilateral rupture with a given fault type is approximately proportional to the square of the duration. This relationship fits well with these data.