At 1: 45 on January 8, 2022, an earthquake of magnitude 6.9 occurred in Menyuan County, Qinghai Province. The coseismic displacement field obtained from GNSS continuous observation data near the epicenter showed that the coseismic displacement of QHME station, which is closest to the epicenter, was the largest, reaching 20.31 mm in the east-west direction and -35.45 mm in the north-south direction.
The coseismic displacements of five stations near the epicenter reflected the characteristics of left-lateral coseismic rupture of the earthquake. The results of regional strain time series and baseline time series between GNSS stations showed that the crustal movement in the north section of Lenglongling fault is stronger than that in the south section, which corresponds to the area where the earthquake occurred. The results of dynamic GNSS strain field before the earthquake showed that the shear strain value in the study area was small, with a slight decreasing trend, but it was always at the edge of the high strain zone. The slip velocity of the seismogenic fault changed little, and the value first increased and then weakened. The degree of fault blocking increased before the earthquake, which may lead to the occurrence of the earthquake.