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一、环球性征兆 1755年里斯本大地震时,远离震中3000公里的北欧湖水有一米起伏振动;1976年龙陵、唐山、平武大震期间,湖北有一个井的水位一直有规律地变化。这种几千公里之外的水位变化无法用地倾斜观点解释。 1977年6月22日汤加岛发生8.1级地震前,北京密云水库按装的激光锁相应变仪在固体潮背影上记录到应变波动曲线。这现象也无法从地应力传递得到回答。
I. GLOBAL SYMPTOMS During the Lisbon earthquake in 1755, a one-meter fluctuating vibration was found in the Nordic lake far away from the epicenter 3,000 kilometers. During a 1976 Longling, Tangshan and Pingwu large earthquakes, the water level in one well in Hubei had been regularly changing. This thousands of kilometers away from the water level changes can not be tilted point of view. Before the 8.1 magnitude earthquake on Tonga Island on June 22, 1977, the strain fluctuation curve was recorded on the solid tidal background by the laser-locked strain gauges mounted on the Miyun Reservoir in Beijing. This phenomenon can not be answered from geostress.