Table 4 Component matrix in Chenghai area.

Slope

0.228

0.875

0.035

− 0.347

0.074

Slope direction

− 0.05

0.047

− 0.013

0.214

0.972

Distance to stream

0.638

− 0.051

− 0.429

0.114

− 0.012

Distance to fault

0.638

− 0.051

− 0.429

0.114

− 0.012

NDVI

0.313

0.305

0.514

0.449

− 0.14

PGA

− 0.874

0.457

− 0.32

0.289

− 0.089

Epicenter distance

0.464

− 0.432

0.615

− 0.292

0.099

Contribution rates/%

27.228

21.488

17.161

13.867

11.955

Accumulative contribution rate/%

27.228

48.716

65.877

79.744

90.699