1. M L 7.3 M W 7.6

2. 11/11/20152 Chi-Chi epicenter Landslides

3. Jiufengershan landslide

5. Geological context

6. 11/11/20156 Geological Section 1.5 km × 40~60m Elevation difference: ~ 500m Dip angle: 20°

7. 11/11/2015 Jiufenershan landslide 7 Litho-Stratigraphy ageStratumLithologyT (m) Plio.Kueichulin (KC)Calcareous SS.?? M Mio. H Changhukeng (CHt)Sdy. St. and Sh.180 M Changhukeng (CHm)Muddy SS.90 L Changhukeng (CHb)glauconite Sh.80 M Mio. H Shihmen (SMt)Massive SS.165 M Shihmen (SMm)Thick muddy SS.110 L Shihmen (SMb)Interbedded145 E Mio.Tanliaoti (TL)Thick Sh.??

9. 11/11/20159

10. 10 Monocline ?

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22. 11/11/201522 Cut-and-fill volume Cut: 42.1 x 10 6 m 3 Fill: 50.5 x 10 6 m 3

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25. 11/11/201525 Tsaoling landslide

26. 11/11/201526 Time Triggered by Landslide process Slide volume (km 3 ) Dam height (m) Effects 1862 Earthquake (M L =6-7) Landslide formation of a dam 1898Rainfall (?)Landslide dam broke 1941 Earthquake (M L =7.1) 0.10-0.1570-140 36 persons killed and formation of a dam 1942Rainfall (776mm)0.15-0.20140-170 1 persons killed and increased landslide dam 1951Rainfall (770mm)0.120140-200 137 persons killed and broke landslide dam 1979 Rainfall (327mm)0.02690Landslide formation of a dam Rainfall (624mm)0.040Landslide dam broke 1999 Earthquake (M L =7.3) 0.12645 39 persons killed and formation of a dam Historical events in Tsaoling

27. Geological map

28. 11/11/201528 Stratigraphic column and profile

29. DTMs

30. 11/11/201530 Geological profile Sliding area

31. 11/11/201531 Cut-and-fill volume 1999 vs.2003

32. 11/11/201532 Cut-and-fill volume 2003 vs.2007

33. 11/11/201533 Retreat of the scarp main scarp 730m 1998 1999 2003 2007

34. 11/11/201534 Retreat of the scarp 155m minor scarp 1998 1999 2003 2007

35. 11/11/201535 Retreat of the scarp 38m 1998 1999 2003 2007 lateral scarp

36. 11/11/201536 Retreat of the scarp 2003 2007 280m upstream

37. 11/11/201537 Retreat of the scarp 240m downstream 2003 2007

38. 11/11/201538 B E D A C

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