Earthquake induced landslides

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Information about Earthquake induced landslides
Science-Technology

Published on August 25, 2008

Author: Dr_Dave

Source: authorstream.com

Earthquake induced landslides lessons from Taiwan and Pakistan : Earthquake induced landslides lessons from Taiwan and Pakistan David Petley 26th August 2008 http:daveslandslideblog.blogspot.com 2007 fatal landslides : 2007 fatal landslides 2008 fatal landslides (to end of July) : 2008 fatal landslides (to end of July) Worldwide fatal landslides in 2007 by size : Worldwide fatal landslides in 2007 by size Slide 6: 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 7: Kashmir earthquake 8th October 2005 Mw = 7.6 Depth = 10 km Images: Roger Bilham and GSI Japan Wenchuan earthquake : Wenchuan earthquake 12th May 2008 Mw = 7.9 Depth = 8 km Images: Fawu Yang, DPRI Kyoto 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 Hattian landslide : Hattian landslide GSI Japan landslide map from SPOT imagery : GSI Japan landslide map from SPOT imagery Kashmir modelled iso-acceleration contours for soft ground (Omer 2007) : Kashmir modelled iso-acceleration contours for soft ground (Omer 2007) 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 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) 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 Taiwan rainfall – Typhoon Mindule : Taiwan rainfall – Typhoon Mindule Slide 31: 2000 2004 Lin et al. 2007: Choushui River : Lin et al. 2007: Choushui River Response upstream of the affected area – Sung Mao : Response upstream of the affected area – Sung Mao Slide 34: Response downstream of the affected area – Pailau Bridge Pai-Lau bridge : Pai-Lau bridge Chinan, Wu-Hsi : Chinan, Wu-Hsi Long term trend at Pai-Lau Bridge : Long term trend at Pai-Lau Bridge Before the earthquake : Before the earthquake Hydroelectric scheme inlets November 2006 : November 2006 Downstream consequencesKukuan after Typhoon Mindule in 2001 : Downstream consequencesKukuan after Typhoon Mindule in 2001 Slide 41: Downstream consequencesKukuan after Typhoon Toraji in 2004 Slide 42: Downstream consequencesKukuan in 2006 Costs of landslides and sediment productionTachia River Valley : Costs of landslides and sediment productionTachia River Valley Total costs to date = £384 million Required rebuild costs of road = £100 million Consisting of: Landslide induced sediment production induced damage to HEP: £150 million Additional power generation needs: £160 million Initial repair of road: £26 million Additional agricultural transportation costs to date: £48 million But to date only 15% of the displaced sediment has been released Slide 45: Area hit by strong typhoon in July 2008 Further massive landslides Conclusions : Conclusions Presentation at: http:daveslandslideblog.blogspot.com

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