1976年7月28日唐山发生7.8级大地震,震前地磁偏角有没有异常?现就我们收集到的观测资料,谈一点粗浅的认识。 资料选择及异常识别 唐山地震前,在唐山及其周围布设了比较多的陶瓷偏角仪。我们共收集到15个观测点的资料,根据观测时间长、曲线变化较平稳、观测条件符合规范要求等原则,选用其中8个点的资料进行分析。 July 28, 1976 Tangshan 7.8 magnitude earthquake occurred before the earthquake magnetic declination there is no exception? Now we collected the observations, to talk a little superficial understanding. Data Selection and Abnormal Recognition Before the Tangshan earthquake, more ceramic densometers were laid in and around Tangshan. We collected a total of 15 observation points of information, according to the observation time, the curve changes more smoothly, the observation conditions in line with regulatory requirements and other principles, the selection of 8 points of the data for analysis.