东川6.5级地震前的外部环境异常

1966年2月5日东川6.5级地震前3年震区周围降水量的大幅度涨落,震前1月内气温、地温的明显增高,震前1—2天霾和动物异常的出现。以及地震发生在近“望”时刻等环境变化,说明东川6.5级地震前既有地下热能输出,又受到地表动荷载和天体引潮力的激励,即东川6.5级地震是在地壳内外作用叠加下发生的。

EXTERNAL ENVIRONMENT ANOMALIES BEFORE DONGCHUAN EARTHQUAKE (M = 6.5)

Before the Feb. 5, 1966, Dongchuan earthquake (M = 6.5) there appeared various environmental variations, such as the large scale rainfall fluctuation around the seismic area in 3 years, obvious increment of atmospheric temperature and geotemperature in a month, haze and ancmalous animal behavior in 1-2 days, and a near "the 15th day of a lunar month" of its occurrence time. All those environmental variations showed that there existed not only the heat energy output from ground but also the excitement under surface loading and celestial tidal generating force before Dongchuan earthquake, i. e. the event occurred under the superposed action of both internal and external forces of the earth crust.