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Plumb line variations(PLV) at Tangshan during the years of 1987―1998 are determined by using the 46 batch repeated gravity observations of the Beijing-Tangshan network.It has been found that PLV at Tangshan are related with the 38 earthquakes in this period.It appears that the time of an earthquake around Tangshan is usually quite the same when PLV at Tangshan begins moving in opposite direction.
Plumb line variations (PLV) at Tangshan during the years 1987-1998 are determined by using the 46 batch repeated gravity observations of the Beijing-Tangshan network. It has been found that PLV at Tangshan are related with the 38 earthquakes in this period. It appears that the time of an earthquake around Tangshan is usually quite the same when PLV at Tangshan begins moving in opposite direction.