Landslide hazard in the Pacific Islands

The landslide hazard for the tropical islands of the western Pacific is assessed indirectly by reference to their volcanicity, seismic activity, landform, location and social and administrative factors. Ongoing tectonic activity accompanied by rapid weathering and erosion has produced islands with high relief, steep slopes and restricted areas for habitation within the lower catchments. These inherently hazardous conditions are from time to time subjected to high intensity, tropical cyclone rainfalls which are known to produce devastating landslide episodes. In parts of the region sensitivity of the terrain to landslides has been enhanced by mining activity and deforestation. The small size, isolation and recent political reorganization of many island groups present special problems in hazard mitigation within the region.