Vulnerabilities include heavy storms, flooding, tsunamis, mudslides, and earthquakes. Residents were warned about the possibility of torrential rains, flooding and mudslides. Intensive rain from typhoons often leads to disastrous mudslides. Malibu's dry brush and steep clay slopes make it prone to fires, floods, and mudslides. Its natural threats are earthquakes, mudslides, and volcanic eruptions. Rio de Janeiro floods and mudslides are not an isolated phenomenon. On Dominica, the cyclone caused minor flooding and mudslides. Environmentally, heavy rains encourage mudslides and flooding in all areas affected. There has been erosion, flooding and mudslides. In Puerto Rico, flooding and mudslides damaged roads, homes, and crops. Several rivers overflowed as a result, which in turn caused widespread flooding and mudslides. Flooding by Keith caused several mudslides and a few rivers reached historic levels. Mudslides in volcanic terrain (called lahars) occur after eruptions as rain remobilizes loose ash deposits. Similar impact was reported in Puerto Rico, with heavy precipitation causing flooding and mudslides. The typhoon caused 30 casualties from mudslides and heavy rain.