An earthquake is a sudden, rapid shaking of the ground caused by the movement of large pieces of the earth’s crust, called tectonic plates. As the tectonic plates move against each other, they can become stuck together, causing stress between the plates to build up until it eventually overcomes the friction holding them together. When this happens, the stress is released and the plates suddenly slip past each other, creating the shaking that is called an earthquake. Healdsburg is not located within an Alquist-Priolo Earthquake Fault Zone. However, the City is in a seismically active region, and all of Healdsburg is at risk of one or more seismic hazards. All of Healdsburg, including all critical facilities, residential building units, and population, fall within areas with the potential for either a violent or extreme level of ground shaking.

Earthquakes pose numerous risks to critical facilities and infrastructure. Risks, or the harm or losses, that are likely to result from exposure to earthquakes and liquefaction include:

• Fire from broken gas lines and power lines 
• Flooding from broken dams 
• Casualties (fatalities and injuries) from falling debris or secondary hazards 
• Utility outages
• Economic losses for repair and replacement of critical facilities, roads, buildings, etc. 
• Indirect economic losses, such as income lost during the downtime that results from damage to private property or public infrastructure 
• Roads or railroads that are blocked or damaged can prevent access throughout the area and can isolate residents and emergency service providers needing to reach vulnerable populations or to make repair.

Fault Parameters

Earthquake Preparedness

Practice how to protect yourself during earthquakes, with family and coworkers.

Make an Emergency Plan: Create a family emergency communications plan that has an out-of-state contact. Plan where to meet if you get separated. Make a supply kit that includes enough food and water for several days, a flashlight, a fire extinguisher and a whistle.

Being prepared allows you to avoid unnecessary excursions and to address minor medical issues at home, alleviating the burden on urgent care centers and hospitals.

Remember that not everyone can afford to respond by stocking up on necessities. For those who can afford it, make essential purchases and slowly build up supplies.

Protect Your Home: Secure heavy items in your home like bookcases, refrigerators, water heaters, televisions and objects that hang on walls. Store heavy and breakable objects on low shelves.

Consider making improvements to your building to fix structural issues that could cause your building to collapse during an earthquake.

Consider obtaining an earthquake insurance policy. A standard homeowner’s insurance policy does not cover earthquake damage.

During an Earthquake

 If an earthquake happens, protect yourself right away:

• If you are in a car, pull over and stop. Set your parking brake.
• If you are in bed, turn face down and cover your head and neck with a pillow.
• If you are outdoors, stay outdoors away from buildings.
• If you are inside, stay and do not run outside and avoid doorways.

1. Drop (or Lock)

Wherever you are, drop down to your hands and knees and hold onto something sturdy. If you’re using a wheelchair or walker with a seat, make sure your wheels are locked and remain seated until the shaking stops.

2. Cover

Cover your head and neck with your arms. If a sturdy table or desk is nearby, crawl underneath it for shelter. If no shelter is nearby, crawl next to an interior wall (away from windows). Crawl only if you can reach better cover without going through an area with more debris. Stay on your knees or bent over to protect vital organs.

3. Hold On

If you are under a table or desk, hold on with one hand and be ready to move with it if it moves. If seated and unable to drop to the floor, bend forward, cover your head with your arms and hold on to your neck with both hands.

Stay Safe After

 There can be serious hazards after an earthquake, such as damage to the building, leaking gas and water lines, or downed power lines. You should: 

• Expect aftershocks to follow the main shock of an earthquake. Be ready to Drop, Cover, and Hold On if you feel an aftershock.
• If you are in a damaged building, go outside and quickly move away from the building. Do not enter damaged buildings.
• If you are trapped, send a text or bang on a pipe or wall. Cover your mouth with your shirt for protection and instead of shouting, use a whistle.
• If you are in an area that may experience tsunamis, go inland or to higher ground immediately after the shaking stops. Avoid contact with floodwaters as they can contain chemicals, sewage, and debris.
• Check yourself to see if you are hurt and help others if you have training. Learn how to be the help until help arrives.
• If you are sick or injured and need medical attention, contact your healthcare provider for instructions. If you are experiencing a medical emergency, call 9-1-1.

Once you are safe, pay attention to local news reports for emergency information and instructions via battery-operated radio, TV, social media or from cell phone text alerts.

•  Use social media to let people know you’re okay.
• Use text messages to communicate, which may be more reliable than phone calls.
• Be careful when cleaning up. Wear protective clothing, including a long-sleeved shirt, long pants, work gloves and sturdy thick-soled shoes. Do not try to remove heavy debris by yourself. Use an appropriate mask if cleaning mold or other debris. People with asthma and other lung conditions and/or immune suppression should not enter buildings with indoor water leaks or mold growth that can be seen or smelled. Children should not take part in disaster cleanup work.