美国纽约州立大学吴大铭教授于1981年4月22日至25日访问了国家地震局地震研究所。 吴大铭教授在汉期间,作了关于维那滤波法分析形变前兆资料的学术报告。报告介绍了利用我国大灰厂、牛口峪、香河等台站所取得的形变资料,对降雨、温度干扰因素进行滤波排除。报告指出,通过滤波法,排除了噪声之后,结果发现均有前兆异常现象, Professor Wu Daming from New York State University visited the Institute of Earthquake Research of the State Seismological Bureau from April 22 to April 25, 1981. During his stay in China, Prof. Wu Daming made an academic report on the analysis of the precursor of deformation by the Weiner filtering method. The report introduced the use of deformation data obtained from the stations of China’s large gray factory, Niu Kouyu and Xianghe, filtering and eliminating the interference factors of rainfall and temperature. The report pointed out that by filtering, excluding the noise, the results showed that there are precursory anomalies,