The Risk Atlas of Mexico City, Mexico: A Tool for Decision-Making and Disaster Prevention

Abstract We present a Geographical-Information-System-based Risk Atlas (GIS-RA) of Mexico City, Mexico. The main purposes are to provide a local-government level tool for implementing preventive and remedial actions useful for land-use development plans and to strengthen the culture for disaster prevention. We identified the prevalent social risk to the more relevant hazards in Mexico City (CDMX): earthquakes, volcanic eruptions, floods, landslides, forest fires, and land subsidence. A total of 274 shape-file maps were generated in this project. Seismic hazard was estimated for return periods (RP) of 20, 125, 250, and 475 years. Three areas in central and northwestern CDMX were identified along the Younger Chichinautzin Monogenetic Volcanic Field with high probability of forming a new volcano. Subsidence is concentrated to the east and southeast of CDMX, where subsidence rates are among the highest worldwide. Flooding events were estimated for RP of 2, 5, 10, 50 and 100 years and the majority of them are concentrated in the central and northern sectors of the city. During the dry season (December-April), southern CDMX has very high probability of forest fire occurrence. There is high susceptibility of landslides on the west and southwest of the city. The goals of this GIS-RA are to: 1) improve the knowledge of the potential impact of local hazards; 2) provide elements for disaster prevention, mitigation, preparedness, and response; 3) benefit decision-makers with robust risk data; 4) provide information for land-use planning; and 5) support further research to reduce the impact of disasters.