A Crustal Deformation Pattern on the Northeastern Margin of the Tibetan Plateau Derived from GPS Observations

The northeastern margin is a natural experimental field for studying crustal extrusion and expansion mechanisms. accurate deformation pattern key point in the analysis of regional mechanisms seismic hazard research judgment. In this paper, present-day GPS velocity on Tibetan Plateau was obtained from encrypted observations around Haiyuan–Liupanshan fault zone, combined with 2010 to 2020. Firstly, we divided study area into three relatively independent blocks: ORDOS block, Alxa Lanzhou block; secondly, distribution zone taken account obtain optimal inversion model; finally, using block back-slip dislocation model, slip rate distribution, locking depth, deficit each fault. results indicate that Laohushan Fault Haiyuan are dominated by left-lateral strike-slip, while Liupanshan thrust dip-slip, Guguan–Baoji has both strike-slip dip-slip components. maximum depths Fault, 5 km, 13 15 10 respectively, strong middle section weak eastern western section. still post-earthquake stress adjustment stage. decays 3.6 mm/yr 1.8 west east along zone. Combined geological historical data, suggest mid-long-term risk high.