Millions were under tsunami warnings after the Tonga volcano eruption last week. What exactly does that mean, and what should you do when an alert is issued?
Make sure you're staying updated with reliable information sources. See the previous post for more on where and how to stay up-to-speed. 
Have your go-bag and emergency plan at the ready. Typically for tsunamis you want to move inland and seek higher ground, like a hilltop. 
Understand your risk based on where you are. I live a few miles from the ocean in San Francisco, so I have a different level of risk than those living beachside. If you live in an area that can be threatened by tsunamis, look at your community's evacuation plan and recommended routes.
Check to see if your homeowners' or rental insurance policy covers flooding and earthquakes. Many insurance policies exclude damage from these types of emergencies, and it must be added on or purchased separately.
If you're at the beach, know the signs that may indicate a tsunami is on the way. If the ocean begins rapidly rolling backward, frothing, and/or you hear a loud roar from the sea, head for higher ground immediately. Warn those around you if you're able, but do not waste any time.
Once you're safe, stay away from the flood water and any buildings that show signs of damage. Flood waters can contain dangerous debris or chemicals, and could even be electrified.
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