The protective measures that you take will vary based upon the nature of the threat or incident. Those taken for a tornado may be different from that of a hurricane, earthquake, or hazardous materials incident.
By learning about specific threats you begin to prepare yourself to react in an emergency. Specific information on potential disasters, including biological, chemical, nuclear, and radiological incidents, can be found by clicking on the "Navigation" tab at: https://www.ready.gov/
Make sure to utilize this information according to your personal circumstances, and follow instructions received from local authorities on the scene. With these simple preparations, you can be ready for the unexpected.