Table 8.

Details of the vulnerability indexes of the four cities

	Beijing	Wuhan	Dalian	Urumqi
X1*(2/pi)*[1/tan(YCITY)]	0.0718	0.0539	0.0271	0.0193
X2*(2/pi)*[1/tan(R0)]	0.0429	0.0429	0.0429	0.0429
X3*(2/pi)*[1/tan(IP)]	0.0343	0.0343	0.0343	0.0343
X4*MEA	0.0038	0.379	0.0038	0.0948
X3*(2/pi)*[1/tan(MED)]	0	− 0.0159	0	0
X6*UND	0.0038	0.379	0.0038	0.0038
YCITY	1.9567	1.0839	0.4394	0.0193
GDP	0.136	0.0666	0.0292	0.0139
PD	0.671	0.7637	0.3634	0.1457
MP	0.5781	0.1666	0.0778	0.0953
RPK	0.6235	0.0346	0.0067	0.0103
PQ	− 0.0519	0.0524	− 0.0377	0.0395