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Working Party Matters


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Landslides & Slope Instability


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Subsidence & Collapse Hazard


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Seismic Hazard


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Flood Hazard


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Tsunami Hazard


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Volcanic Hazard


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Gas Hazard


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Fault Reactivation Hazard


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Landslide & Slope Instability Geohazards

Index | Diagnostic Characteristics | Geographic Occurrence | Investigation & Mitigation | Key Contacts & Expert AdvicePhoto Gallery  | Essential References & Further Reading | Definitions & Glossary |

The term landslide, as defined by Cruden (1991) for the Working Party on World Landslide Inventory, denotes “the movement of a mass of rock, debris or earth down a slope”. Varnes (1978) indicated that slope movement would be a better comprehensive term as it did not infer process. Varnes defined a landslide as 'a downward and outward movement of slope forming materials under the influence of gravity'. Brunsden (1984) preferred the term mass movement and distinguished this from mass transport as being a process which did not require a transporting medium such as water, air or ice (Dikau et al, 1996). The phenomena described as landslides are not limited to either the “land” or to “sliding”, and usage of the word has implied a much more extensive meaning than its component parts suggest. Ground subsidence and collapse are excluded.
 

Lyme Regis from the south-west. (Image Source: Geoff Davis).

The Spittles landslide system, showing large scale landsliding in the Charmouth Mudstone Formation and in the Upper Greensand above. This landslide system is expanding westwards towards Lyme Regis. (Image Source: Geoff Davis).

 

Index | Diagnostic Characteristics | Geographic Occurrence | Investigation & Mitigation | Key Contacts & Expert AdvicePhoto Gallery  | Essential References & Further Reading | Definitions & Glossary |


Engineering Group Working Party on Geological Hazards