Our modern industrial cities are laden with chemical and petroleum products that could contribute substantially to the generation of toxic products following an earthquake (61). Industrial storage facilities for hazardous materials might explode or leak, and damage at a nuclear power plant could lead to widespread contamination by radioactive materials. In a major earthquake, pipelines carrying natural gas, water, and sewage can be expected to be disrupted. Following the Loma Prieta earthquake, about 20% of after-earthquake injuries were caused by toxic materials (31).