Insight into the preparation of the 2016 M6.4 Menyuan earthquake from terrestrial gravimetry-derived crustal density changes.

Geophysical processes of the pre-earthquake activities are difficult to be determined since less pre-seismic signal is observed directly. Crustal density changes derived from the periodical terrestrial gravimetry may provide meaningful deep information for the pre-earthquake cue. In this study, the crustal density changes following the 2016 M6.