Abstract:Through the analysis of the data recorded by the Yry-4 component strain gauge, the water level gauge, and the seismograph at Linxia seismic station, it is found that before the Wenchuan MW7.9 earthquake on May 12, 2008, both of the pre-slip seismic phase Xp and the tremor seismic phase Tp were recorded by the above three instruments in a similar period. In this paper, based on the summary of the record characteristics of Xp and Tp phases, the physical mechanism of pre-slip and tremor phase recorded before the earthquake was confirmed and explained by the results of indoor small-scale stick slip experiments. The results showed that: on April 18 and May 6, 2008, two large-scale pre-slip dislocations occurred on the block where Linxia station is located, and N tremors were accompanied before and after the pre-slip. These two large-scale pre-slip dislocations may be related with the Wenchuan MW7.9 earthquake.