SUMMER 2003GEOHAZARDS COURSE AT UWI, MONA - page 103
Prepared and compiled by
Rafi Ahmad,
Unit for Disaster Studies,
Department of Geography and Geology,
University of the West Indies, Mona, Kingston 7, Jamaica
In this project we use the IDRISI GIS software (Eastman, 1997) to construct a raster (cell-based) map of the KMA based on a 15m by 15m cell size.
The study area contains 2,461,462 such cells.
The GIS software to produce the final landslide hazard maps digitized the landslide inventory and factor maps.
The landslide susceptibility in KMA has been presented on two derivative maps prepared on 1:50,000 metric topographic base maps, sheets 13 and 18, to
... (a) portray deep-seated landslides in bedrock - and
... (b) shallow (active) landslides in the colluvium (that is, surficial materials on hill slopes).
These maps are designated as:
Landslide Susceptibility Classes- Deep Landslides, - and
Landslide Susceptibility Classes- Shallow Landslides.
The purpose of these maps is to convey information on landslide susceptibility in KMA in non-technical form that may be understood by non-geologists.
Only those geologic and geomorphic factors that have a direct bearing on the occurrence of landslides in the study area have been employed in the compilation of susceptibility maps.
Since it is difficult, even in best possible conditions, to specify a time frame for the occurrence of landslides in any area, the present map, only identifies areas potentially affected and does not imply a time frame when a landslide might occur.
In this report, and as is the general practice, landslide susceptibility will be referred to as landslide hazard.
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