京津冀城市群跨区域应急协同网络的结构特征与模式演变分析

In response to the increasingly prominent cross-regional characteristics of disaster risk，by using 130 cross-regional emergency collaborative cases from 13 cities in the Beijing-Tianjin-Hebei urban agglomeration between 2013 and 2022 as data，the structural characteristics and pattern evolution of the cross-regional emergency collaborative network in the Beijing-Tianjin-Hebei urban cluster are examined by social network analysis from three levels：overall，individual，and local. The results indicate that the Beijing-Tianjin-Hebei urban agglomeration has formed a relatively close，balanced，and stable cross-regional emergency collaborative network in the field of emergency management. With the implementation of vertical emergency management intervention policies and the advancement of cooperation，the emergency collaboration network of the Beijing-Tianjin-Hebei urban cluster has evolved from an initial "dual-core leadership，peripheral participation" model to a "dual-core boost，peripheral drive" model. Within the network，there are three types of cohesive subgroups：core leadership，intra-provincial drive，and mixed docking，with the number of subgroups gradually decreasing.