Abstract: Avalanche-induced air blasts represent one of the most frequent and destructive cascading effects of snow avalanches. Characterized by intense destructive force and extensive impact ranges, they can inflict severe damage well beyond the boundaries of the avalanche itself. Nevertheless, reliable methods for evaluating their destructive potential remain limited. This study develops a depth-averaged two-layer model to simulate avalanche-triggered air blasts, incorporating essential physical processes such as mass and momentum transfer, air entrainment, lateral spreading, and cloud drag. By integrating field investigations with numerical simulations, we reconstructed the evolution of the Innerchinn avalanche and the associated air blast events. Results show that the avalanche originated with a volume of 9×10⁴ m³ and traveled a total distance of 2700 m. During its descent, it generated intense air blasts with peak velocities exceeding 40 m·s^-1 and maximum pressures reaching 5.5 kPa, resulting in extensive forest destruction. The most powerful air blast occurred at a bend in the valley, where the flow direction of the avalanche core shifted abruptly, leading to the separation and independent propagation of the air blast. Compared to the avalanche core, air blasts exhibited significantly larger impact areas both horizontally and vertically. In the case of the Innerchinn avalanche, the air blast maintained destructive force up to 15 m above ground level, equivalent to a Force 12 wind load. The mixture of ice crystals and snow dust increased the density and destructive potential of the air blast, rendering it more damaging than a typhoon at comparable wind speeds. This study provides theoretical and technical support for assessing snow avalanche-air blast risks in high-mountain regions.