Are there case studies where hazard mapping reduced mass movement impacts?

Yes, there are several case studies where hazard mapping significantly reduced the impacts of mass movements.

One notable example is the town of La Conchita in California, USA. In 1995, a large landslide occurred, causing significant damage to properties. Following this event, a hazard map was created to identify areas at high risk of future landslides. This map was used to guide development and land use planning, with restrictions placed on building in high-risk areas. When another landslide occurred in 2005, the damage was significantly less than in 1995, largely due to the hazard map guiding safer development.

Another case study is from the Philippines, where hazard mapping has been used to mitigate the impacts of mass movements caused by typhoons. The Mines and Geosciences Bureau produced hazard maps identifying areas at high risk of landslides and flooding. These maps were used to guide evacuation efforts during Typhoon Mangkhut in 2018, helping to reduce the loss of life and property damage.

In Italy, the town of Nocera Inferiore was hit by a devastating landslide in 1998, which resulted in the loss of life and significant property damage. Following this event, a detailed hazard map was created, identifying areas at high risk of landslides. This map was used to guide the relocation of residents from high-risk areas, and to inform the design of mitigation measures such as retaining walls and drainage systems. As a result, when another landslide occurred in 2005, the impacts were significantly reduced.

These case studies demonstrate the effectiveness of hazard mapping in reducing the impacts of mass movements. By identifying areas at high risk, these maps can guide land use planning and the design of mitigation measures, helping to protect lives and property.