Time (year/ month)

Displacement observations/ mm

model 1

Relative error/%

model 2

Relative error/%

model 3

Relative error/%

1978.12

10.32

10.32

0

1979.12

26.96

29.37167

8.94537

26.96

0

1980.12

34.07

32.97365

3.21794

35.43405

4.00365

34.07

0

1981.12

38.65

37.01735

4.22420

38.25624

1.01879

39.87869

3.17901

1982.12

42.98

41.55695

3.31097

41.30320

3.90134

42.02683

2.21771

1983.12

44.93

46.65325

3.83542

44.59285

0.75038

44.29068

1.42292

1984.12

47.16

52.37454

11.05713

48.14451

2.08759

46.67648

1.02527

1985.12

48.38

58.79746

21.53258

51.97904

7.43911

49.19080

1.67590