1960年5月22日智利地震(8.9级),在它发生前大约15分钟美国帕萨迪纳台贝尼奥夫应变仪记到异乎寻常的长周期(300—600秒)波。这可能是震前予滑所引起的长周期波动。以往由于我国尚缺长周期地震仪,所以未能取得大震前予滑的仪器记录。近几年我们用地倾斜仪进行观测,记录到一些强震前发生的长 The Chilean earthquake of May 22, 1960, at 8.9 (8.9), reported an unusually long period (300-600 seconds) wave to the Beneteau Force Gauges of Pasadena, USA about 15 minutes before it occurred. This may be a long-term fluctuation caused by pre-earthquake slip. In the past, because of the lack of long-period seismographs in our country, it failed to obtain the record of the slippery instrument before the earthquake. In recent years we have used the tiltmeter to observe and recorded some of the long before the strong earthquakes occurred