Based on the displacement data obtained from finite fault inversion, the number of independent slip units is used to characterize the magnitude of the seismic rupture complexity and group the events statistically, to study the relationship between rupture complexity and source parameters, to explore the global spatial distribution and regional characteristics of fracture complexity. The results show that for events with a large moment magnitude (Mw ≥ 8.5), the rupture complexity tends to be greater; the earthquake with higher rupture complexity is more likely to be distributed in the shallow crust (≤ 30 km), and the sensitivity of the rupture complexity to the focal depth gradually disappears as the focal depth increases; the events with higher strike-slip fault mechanism components tend to have higher fracture complexity; there is no clear relationship between rupture spatial complexity and seismic energy-moment ratio; the spatial distribution characteristics of rupture complexity is associated with regional geological tectonic environment. The spatial distribution characteristics of fracture complexity can be divided into three categories. The first category is the subduction zone caused by simple collisions between plates and the slip rate and direction at the boundary of the plates are relatively high, and relatively simple event types are main in this case. The second type is the junction of multiple plates, or the sliding rate and direction at the junction of the plates are different in the whole area. The third type is the strong compression inside the continent. The rupture complexity of the second and third types of cases tends to be higher than that of the first type. The rupture complexity can reflect the complexity of the regional stress field to a certain extent.

%U https://xbna.pku.edu.cn/EN/10.13209/j.0479-8023.2022.048