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利用跨鲜水河断裂的二对GPS连续观测点资料,获得了跨鲜水河断裂高精度形变场(误差约1mm)的动态演化轨迹.该轨迹清晰地反映了鲜水河断裂乾宁段和道孚段形变场的明显不同,前者为稳态、后者为非稳态.道孚段的非稳态形变可能与鲜水河断裂在此分段并呈现东、西二支有关.采用一多段脆韧转换带模型对形变场动态演化给出初步的模拟与解释:鲜水河断裂南段转换带内蠕滑稳定,而北段和道孚段呈现间歇状态且平均滑移率高于南段.这可能与断层面介质的物理性质有关,揭示当前断裂南段转换层强度可能高于北段,对应于更长的发震周期.
By using two pairs of continuous GPS observation points across the Xianshuihe fault, a dynamic evolution trajectory of the high-precision deformation field across the Xianshuihe fault (with an error of about 1mm) was obtained. The trajectory clearly shows that the Qianning section The deformation field of Daofu section is obviously different, the former is steady state and the latter is non-steady state. The unsteady deformation of Daofu section may be related to the segment of Xianshuihe fault in this section, The multi-segment brittle-ductile transition zone model gives a preliminary simulation and interpretation of the dynamic evolution of the deformation field: the creep stability in the transition zone of the south segment of the Xianshuihe fault is intermittent and the average slip rate is higher than that of the north segment and the road segment This may be related to the physical properties of the fault plane media, revealing that the current southern transition fault layer intensity may be higher than the northern segment, corresponding to longer earthquake cycles.