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Table 1 Improved tangent angle criteria for landslide warning levels

From: 5G IoT-based geohazard monitoring and early warning system and its application

Deformation stage Uniform velocity deformation stage Early acceleration stage Mid-acceleration stage Critical sliding stage
Early warning level Attention Caution Warning Danger
Warning form Blue alert Yellow alert Orange alert Red alert
Angle of incidence \(\alpha \approx 45^\circ\) \(45^{^\circ } < \alpha < 80^{^\circ }\) \(80^{^\circ } \le \alpha < 85^{^\circ }\) \(\alpha \ge 85^{^\circ }\)