C9
C12
Athlete injury
Event LayerC
C14
C5
C7
Communication failure
Traffic congestion on the way to the venue
Command system failure
Traffic security category risk
Terrorist Attack
Medical and health risks
C10
Group behavior
Guideline layerB
C4
C1
B1
B3
New crown epidemic (Omicron)
A
B2
C8
Event security risk assessment hierarchy model
B5
Major cases
C6
Risk Importance
Meteorological security risk
B4
C13
Individual extreme events
Target layerA
C3
Safety and security category risk
Traffic congestion in the venue
C2
Food poisoning
Radio interference
Technology and communication assurance type of risk
C11
