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Concept of Operations For a small-scale tsunami or seiche event with little to no damage or flooding, preparation and response activities will fall under the scope of the City departments normally responsible for these activities, including the Police and Fire Departments, as well as the Port of Redwood City. These departments will act independently within their normal operating procedures to address any issues that may arise during the course of the tsunami or seiche event. For major tsunami or seiche events that result in or have the potential to result in significant damage or flooding, the EOC will be activated as appropriate, and the EOP will guide activities. In such instances, the EOC will provide primary direction and control during the event. If there is a need for regional evacuation or other regional operations, the City will coordinate its efforts with those of neighboring communities and the San Mateo County Operational Area. Evacuation routes will be developed in coordination with the San Mateo County Sheriff's Office and the California Highway Patrol. Tasks Redwood City will be responsible for the overall direction and control of any emergency response activities within the City limits. Such activities may include warning notifications, evacuation and rescue, security in affected areas, cleanup, or other operations that may be necessary. See the Concept of Operations section in the Basic Plan for general information. Tsunamis are regional events. A risk of a tsunami in Redwood City will likely involve the implementation of a Unified Command that involves the San Mateo County Operational Area, and potentially the Cal OES Coastal Administration Region and the statewide level. Depending on the source of tsunami, Redwood City may have very little warning (10 to 15 minutes) or as much as several hours. Information about tsunami alerts is available from the NWS' Pacific Tsunami Warning Center. There are four types of alerts: ❑ Tsunami Information Bulletin: An event has occurred. There is no threat of a tsunami, or the event was very distant and more information is needed. ❑ Tsunami Watch: There is the possibility of a tsunami event. I❑ Tsunami Advisory: A tsunami event that may generate strong currents or dangerous water conditions is occurring, imminent, or expected. ❑ Tsunami Warning: A tsunami event that may inundate dry land and cause flooding is occurring, imminent, or expected. The type of alert will determine the appropriate tasks for Redwood City. Note that alerts may be upgraded or downgraded as situations change. If an alert has been issued for Redwood City, comply with the "Increased Readiness Actions" in this Annex. D-74