基金项目: | Acknowledgements The groundwater level and bulk strain data are from the precursor observation networks in China. The authors sincerely thank Prof. Baoshan Wang and Dr. Weilai Wang and the two anony- mous reviews for their constructive suggestions. Thanks are given to Prof. Agnew for providing the "ERTID" program for calculating the theoretical Earth tides. This work was supported by the National Natural Science Foundation of China under grant 1Nos. 40674024 and 41040036 |