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to download report - Geological Survey of Ireland

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* 14 Topples were mapped during the project, statistical analysis with this small sample may be misrepresentative.It was decided <strong>to</strong> categorize them as falls.Landslide classification figures for the 694 events are shown in Table 5.7. It was decided <strong>to</strong> omit the man-madeslides from the analysis, therefore, a <strong>to</strong>tal <strong>of</strong> 691 events were used for the statistical analysis.Statistical AnalysisLandslides mapped during image interpretation and fieldwork were coded as seen in Table 5.6. Landslideclasses were treated separately during the statistical analysis. The literature review and the fieldwork observationsreveal that fac<strong>to</strong>rs triggering landslides differ depending on the landslide type. The division <strong>of</strong> the landslides in<strong>to</strong>the four groups described above was considered the best approach <strong>to</strong> get an adequate number <strong>of</strong> slides forstatistical analysis, and <strong>to</strong> group slides where triggering and conditioning fac<strong>to</strong>rs are be similar.The conditioning fac<strong>to</strong>rs treated during the statistical analysis are listed below. Other conditioning fac<strong>to</strong>rs suchas rainfall or structural geology were not included as the available datasets were not suitable for this exercise:Bedrock typeSoil parent materialLand coverSlopeAspectElevationTable 5.7. Number and type <strong>of</strong> landslides mapped.53

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