This study investigates the seismogenic characteristics of the 2025 Dingri MS 6.8 earthquake through multiparametric GNSS analyses of velocity field,strain rate evolution and displacement patterns across pre-seismic a...This study investigates the seismogenic characteristics of the 2025 Dingri MS 6.8 earthquake through multiparametric GNSS analyses of velocity field,strain rate evolution and displacement patterns across pre-seismic and co-seismic phases.Our findings demonstrate spatiotemporally heterogeneous crustal deformation exhibiting kinematic precursors correlating with subsequent rupture propagation.The epicentral region exhibited prolonged N-S compressional strain accumulation accompanied by accelerated E-W extensional deformation and progressive counterclockwise rotation of principal strain axes three years prior,indicating enhanced local normal fault activities.Co-seismic observations delineate significant displacement domains,with the XZSJ(~95 mm)site documenting the largest northeastward motion,consistent with rupture propagation along secondary N-E trending structures.Co-seismic strain analysis identifies concentrated seismic moment release primarily west of the Xainza-Dinggye Fault and north of the Southern Qinghai-Xizang Detachment Fault system,displaying normal fault kinematics in agreement with the seismic source mechanism.The co-seismic strain partitioning pattern shows critical implications for regional N-S trending normal fault system,necessitating sustained geodetic monitoring to advance understanding of seismic cycle deformation in this area.展开更多
基金supported by grants from the National Natural Science Foundation of China(42374010,42004010).
文摘This study investigates the seismogenic characteristics of the 2025 Dingri MS 6.8 earthquake through multiparametric GNSS analyses of velocity field,strain rate evolution and displacement patterns across pre-seismic and co-seismic phases.Our findings demonstrate spatiotemporally heterogeneous crustal deformation exhibiting kinematic precursors correlating with subsequent rupture propagation.The epicentral region exhibited prolonged N-S compressional strain accumulation accompanied by accelerated E-W extensional deformation and progressive counterclockwise rotation of principal strain axes three years prior,indicating enhanced local normal fault activities.Co-seismic observations delineate significant displacement domains,with the XZSJ(~95 mm)site documenting the largest northeastward motion,consistent with rupture propagation along secondary N-E trending structures.Co-seismic strain analysis identifies concentrated seismic moment release primarily west of the Xainza-Dinggye Fault and north of the Southern Qinghai-Xizang Detachment Fault system,displaying normal fault kinematics in agreement with the seismic source mechanism.The co-seismic strain partitioning pattern shows critical implications for regional N-S trending normal fault system,necessitating sustained geodetic monitoring to advance understanding of seismic cycle deformation in this area.
