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Landslide Susceptibility of Portland, Jamaica: Assessment and Zonation - page 15 / 16

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S. BHALAI Landslide susceptibility of Portland, Jamaica

6. CONCLUSION The parish of Portland is known for the prevailing landslide problems. This is particularly due to the higher annual rainfall and seismic activity than other places in Jamaica. Bivariate statistical method, specifically simple map combination, is employed to generate a model that predicts landslide susceptibility using the predisposing factors of landslides, namely elevation, slope gradient and aspect, lithology and geological structure compared with an inventory of

known landslide occurrences. The coverages of these causative factors are weighted based on the comparisons and combined to generate the final model. This model, tested and refined with an inventory of known landslides (not used in the primary analytical stage), predicted 80% of the landslide sources in the zones of higher landslide susceptibility. This model (assembled with the guidelines; Figure 19) represents an effort of the Government of Jamaica to respond to the need to safeguard citizens from disaster-

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