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Geoenvironmental Disasters

Table 1 Data analyses and results obtained from the Frequency Ratio model

From: GIS-based landslide susceptibility mapping and assessment using bivariate statistical methods in Simada area, northwestern Ethiopia

Factor

Class

Npix(Ni,j)

% Npix(Ni,j)y

Npix(Si,j)

% NPix(Si.j)x

FR = x/y

Slope (degree)

(0–5)0

15,104

7.314

97

1.892

0.259

(5–12)0

71,393

34.571

1362

26.570

0.769

(12–30)0

110,037

53.284

2914

56.850

1.067

(30–45)0

9661

4.678

703

13.714

2.932

> 450

316

0.153

50

0.975

6.375

Curvature

(−3.60) - (−0.001)

104,276

50.494

3300

64.378

1.275

(−0.001) - 0.001

1944

0.941

45

0.878

0.933

0.001–3.787

100,291

48.564

1781

34.744

0.716

Aspect

N(0–22.5)

9699

4.697

261

5.092

1.084

NE(22.5–67.5)

37,106

17.968

1466

28.599

1.592

E(67.5–112.5)

41,856

20.268

1226

23.917

1.180

SE(112.5–157.5)

31,166

15.092

636

12.407

0.822

S(157.5–202.5)

26,762

12.959

591

11.529

0.890

SW(202.5–247.5)

28,551

13.825

522

10.183

0.740

W(247.5–292.5)

18,760

9.084

262

5.111

0.563

NW(292.5–337.5)

7457

3.611

68

1.327

0.367

N(337.5–360)

5154

2.496

94

1.834

0.735

Distance to stream(m)

0–50

24,940

12.076

1028

20.055

1.661

50–100

22,768

11.024

940

18.338

1.663

100–150

23,290

11.277

632

12.329

1.093

150–200

16,063

7.778

349

6.808

0.875

> 200

119,467

57.845

2177

42.470

0.734

Land use

Agricultural Land

143,001

69.241

3091

60.300

0.871

Moderate Forest

4844

2.345

22

0.429

0.183

River

2048

0.992

77

1.502

1.515

Graze Land

29,754

14.407

1477

28.814

2.000

Sparse Forest

3481

1.686

121

2.361

1.401

Settlement

14,047

6.801

54

1.053

0.155

Bush

9353

4.529

284

5.540

1.223

Lithology

Residual Soils

26,102

12.639

61

1.190

0.094

Trachyte

10,983

5.318

149

2.907

0.547

Weathered Tuff

59,963

29.035

1007

19.644

0.677

Rhyolite

36,735

17.788

1191

23.234

1.306

Colluvial deposit

25,804

12.495

915

17.850

1.429

Weathered Basalt

45,022

21.800

1751

34.159

1.567

Alluvial deposit

1910

0.925

52

1.014

1.097

Rainfall (mm/yr)

627–727

39,813

19.277

811

15.821

0.821

727–813

53,885

26.091

754

14.709

0.564

813–901

51,601

24.985

1802

35.154

1.407

901–994

34,881

16.889

1253

24.444

1.447

994–1125.2

26,348

12.758

506

9.871

0.774

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