Earthquake induced landslides lessons from Taiwan and Pakistan :Earthquake induced landslides lessons from Taiwan and Pakistan David Petley http:daveslandslideblog.blogspot.com


Fatal landslides: 2006, 2007 and 2008 :Fatal landslides: 2006, 2007 and 2008 2008 landslides to end of September


2008 fatal landslides (NB Wenchuan mostly not included) :2008 fatal landslides (NB Wenchuan mostly not included)


Worldwide fatal landslides in 2007 by size :Worldwide fatal landslides in 2007 by size


Slide 7:Diagrams: Bilham and Yu 2000 The morphology of thrust faulting in the 21 September 1999, Chichi, Taiwan earthquake. Journal of Asian Earth Sciences, 18, 351-367. Chi-Chi earthquake 21st September 1999 Mw = 7.6 Depth = 8 km


Slide 8:Kashmir earthquake 8th October 2005 Mw = 7.6 Depth = 10 km Images: Kamp et al. 2008 Geological Survey Pakistan


Chi-Chi landslides :Chi-Chi landslides >22,000 landslides in total 9,272 landslides > 625 m2 Total landslide area 128 km2


Distribution of landslides triggered by the earthquake :Distribution of landslides triggered by the earthquake Khazai and Sitar 2003


Landslide distribution and E-W PGA :Landslide distribution and E-W PGA Khazai and Sitar 2003


Slide 12:Kashmir landslides 2252 landslides > 625 m2 NB: Chi-Chi= 9272


Hattian landslide :Hattian landslide


GSI Japan landslide map from SPOT imagery :GSI Japan landslide map from SPOT imagery Balakot Muzaffarabad


Kashmir modelled slip (Avouac et al. 2006) :Kashmir modelled slip (Avouac et al. 2006)


Kashmir and Taiwan earthquake landslides :Kashmir and Taiwan earthquake landslides


Landslide distance from fault (Sato et al. 2007)Inset: Taiwan data (Meunier et al. 2007) :Landslide distance from fault (Sato et al. 2007)Inset: Taiwan data (Meunier et al. 2007) Number of landslides 600 500 400 300 200 100 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 Distance from fault rupture (km) 83% of landslides within 2 km of fault 90% on hanging wall Chelungpu Fault N-NW S-SE Number of landslides -10 0 10 20 30 40 50 Distance from fault rupture (km) 1200 800 400 0 -10 -20 Elevation (km) 3 2 1 0 Depth (km)


Area affected by landslides (Based on Keefer 1984) :Area affected by landslides (Based on Keefer 1984) 9.0 6.5 Magnitude 1 4.0 100 10k 500k Area affected by landslides (km2) Kashmir Taiwan


Topographic influence(Murphy et al. 2002) :Topographic influence(Murphy et al. 2002)


Comparison: average and 2004 to 2006GPCC (rain gauge) data :Comparison: average and 2004 to 2006GPCC (rain gauge) data


Precipitation deficit (mm) :Precipitation deficit (mm)


Tachia (Techi) River Valley :Tachia (Techi) River Valley


Slide 29:2000 2004


Lin et al. 2007: Choushui River :Lin et al. 2007: Choushui River


Downstream consequencesKukuan after Typhoon Mindule in 2001 :Downstream consequencesKukuan after Typhoon Mindule in 2001


Slide 32:Downstream consequencesKukuan after Typhoon Toraji in 2004


Slide 33:Downstream consequencesKukuan in 2006


Before the earthquake :Before the earthquake Hydroelectric scheme inlets


November 2006 :November 2006


Conclusions :Conclusions Presentation at: http:daveslandslideblog.blogspot.com