Based on the cave strain observation data in 2013 at Taian seismic station,we use the Venedikov harmonic analysis method to calculate the cave strain measurement and phase lag of the tide factor, and
The data recorded during the site survey in the Zhangzhou area in Fujian Province between October 23, 2007 and December 3, 2007 was analyzed. The main methods adopted for the noise level of this area