Abstract: We collected and processed multi-source observational data, including high-rate GNSS, near-field strong motion, and InSAR data, from the area surrounding the epicenter of the 2022 Menyuan M_W6.6 earthquake, to reveal the preliminary results of coseismic displacement waveforms and InSAR deformation fields. Using high-rate GNSS data to quickly obtain fault rupture characteristics, we found that the earthquake was left-lateral strike-slip. The Lenglongling fault exhibited a maximum slip of 3.9 m at a depth of approximately 1 km, while the Tuolaishan fault had a maximum slip of 2.1 m at a similar depth. By combining high-rate GNSS, near-field strong motion, and InSAR data in a joint inversion, the Lenglongling fault’s maximum slip was determined as 3.8 m at a depth of 3.2 km, and the Tuolaishan fault’s maximum slip was 1.2 m at a depth of 2 km. The inclusion of near-field strong motion data in the multi-source joint inversion provided more accurate results compared to existing inversions using only high-rate GNSS and InSAR data. Analysis of the rupture process and source time function indicated that the earthquake lasted 14 seconds, with energy release concentrated in the first 9.5 seconds. The seismic moment release rate peaked at 5 seconds and then gradually slowed down, with a total release of 1.33×10¹⁹ N·m, corresponding to a moment magnitude M_W6.63.

Key words: The 2022 Menyuan M_W6.6 earthquake, High-rate GNSS, Multi-source data, Rupture process