What is a Tsunami?
A tsunami is a series of powerful ocean waves caused by large undersea earthquakes, volcanic eruptions, or underwater landslides. These waves can travel at speeds over 450 miles per hour in the open ocean and can rise to heights of over 100 feet when they reach the coast. Tsunamis can cause severe flooding, property damage, and loss of life, making preparedness essential for Oxnard residents.
Recognizing a Tsunami Threat
Tsunamis can arrive in multiple waves, with crests and troughs occurring over minutes to hours. The first wave is not always the largest, and dangerous waves can continue for several hours after the initial impact. Key warning signs of an imminent tsunami include:
- A strong earthquake near the coast – if you feel shaking, move inland or to higher ground immediately.
- A sudden and unusual withdrawal of ocean water, exposing the sea floor.
- A loud ocean roar or abnormal wave behavior.
If you observe any of these warning signs, do not wait for an official alert—evacuate immediately.
Tsunami Risks for Oxnard
According to the Ventura County Hazard Mitigation Plan, Oxnard is at a low risk for tsunamis. However, the city’s coastal location still makes it important for residents and visitors to be aware of potential threats. While monitoring systems provide alerts for distant tsunamis, local earthquakes can generate waves that arrive within minutes, leaving little time for evacuation. This makes it crucial for residents and visitors to understand the risks and be prepared.
Tsunami Alerts & What They Mean
Tsunami alerts help residents respond appropriately to threats:
- Tsunami WATCH – A significant distant earthquake has occurred, and a tsunami is possible but not yet confirmed. Stay informed by tuning into emergency alerts.
- Tsunami WARNING – A tsunami has been confirmed and is expected to impact coastal areas. Be prepared to follow evacuation instructions.
- Tsunami EVACUATION – If you are within an evacuation advisory area, follow the evacuation routes and move inland, away from the coast.
What to Do Before, During, and After a Tsunami
- Know whether you live, work, or are visiting a tsunami hazard zone in Oxnard.
- Identify the nearest high ground and multiple evacuation routes. Check out the Emergency Resource Map for the Tsunami Evacuation Routes.
- Prepare an emergency kit with food, water, medications, and essential supplies.
- Sign up for emergency alerts from VC Alert and follow local authorities for updates.
- If you are near the coast and feel an earthquake, evacuate immediately—do not wait for official warnings.
- Move inland and uphill as quickly as possible.
- If you are caught in a tsunami wave, grab onto a floating object to stay above water.
- Never go to the beach to watch or surf a tsunami wave—it is extremely dangerous.
- Remain on high ground until authorities declare the area safe.
- Avoid returning to flooded areas, as currents can remain strong for hours.
- Listen to emergency updates and follow instructions for returning home safely.