My presentation at the Round Table discussion at the 10th ISL, Xian,

1. Strength criteria and design approaches for difficult soils and rocks Slow moving rock slides David Petley Durham University, United Kingdom

2. Fatal landslide distribution 2005

3. Cumulative landslide fatalities since Sept 2002 2003 2004 2005 2006 2007 2008 ?

7. Flims, Switzerland

13. Time to failure is inversely related to slope angle in progressively failing rock slopes Scatter due to lithology and size? After Kodera et al. (2005) with additional data

14. Rockfall activity also increases prior to collapse Rosser et al. 2007: Journal of Geophysical Research and this conference Volume of final failure (m 3 )

15. Tertiary phase of progressive failure Peak strength

17. An indication that progressive failure could occur Main, I.G. 2000. A damage mechanics model for power-law creep and earthquake aftershock and foreshock sequences. Geophys. J. Int . 142, 151–161

18. Landslide movement record: New Tredegar, 1930 Data from Jon Carey, Durham University and Halcrow Ltd Primary creep (?) Secondary creep Tertiary creep

19. BPS testing of Tertiary slate from Japan

20. BPS result Dilation