1976年唐山7.8级地震前,滦县榛子镇(距震中约20公里)粮站地震测报员担水时,发现水桶里有很多栉水蝨(当地俗称“湿湿虫”),当时深感奇怪,因为通常很少能在水面上捞到它。大震后才醒悟到这一现象可能与唐山地震有关。 从1977年2月起,对该观察井每天进行三次定时观察。通过三年连续观察资料的统计分 Before the Tangshan earthquake of magnitude 7.8 in 1976, an earthquake observer at the grain station in Hazelzi Town, Luanxian County (about 20 km from the epicenter) was carrying water and found that there were many water bugs (commonly known as “wet insects”) in the bucket. At that time, It is rarely found on water. After the earthquake only wake up to this phenomenon may be related to the Tangshan earthquake. From February 1977 onwards, the observation wells were regularly observed three times a day. Through three years of continuous observation of statistical data points