1982年9月27日10时37分于安徽六安扬公庙(31°36.′8N,116°33.′1E)发生一次3.8级地震(Ms),震源深度为11公里,距合肥地震台68公里,合肥地区有感。该地震是合肥台历年来记录的最大的地方震。震前5天,即9月22日16时10分,合肥台一电磁信息监测装置记到一锯齿波信号,幅度析合输入端约1mv 左右,形态见图1。此信号是本套仪 At 3.837 on September 27, 1982, a magnitude 3.8 earthquake (MS) occurred at Anhui Liuan Yanggong Temple (31 ° 36.’8N, 116 ° 33.’1E) with a focal depth of 11 km. Taiwan 68 km, a sense of Hefei area. The earthquake is the largest recorded by Hefei Taiwan over the years. Five days before the earthquake, that is, at 16:10 on September 22, an electromagnetic information monitoring device of Hefei University recorded a sawtooth signal with an amplitude of about 1mv at the input of amplitude analysis. This signal is the instrument