If you need help with other types of natural disasters, there are lots of otheremergency alert apps.
Best Tsunami App for U.S.
Locations: FEMA
you’ve got the option to choose up to 5 U.S. locations to monitor.

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Different notifications can be set for each location.
you might share real-time notifications with others.
The app isn’t available outside the U.S.

Notification sounds are not customizable.
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Best App for Tsunami Alerts Worldwide: Disaster Alert
18 types of hazard alerts.
Excessively slow load times.
Best Tsunami Text Alert System: SMS-Tsunami-Warning.com
Super simple concept.
Works with hundreds of carriers worldwide.
Monitors up to 5 locations.
Only email alerts are free.
No free trial period.
Couple and family plans are available as well.
Best Tsunami Evacuation App for Pacific Northwest Residents: NVS Tsunami Evacuation
Clearly shows areas of risk.
Doesn’t offer tsunami tracking information.
Only available for Oregon and Washington.
If you live in or travel to Oregon or Washington, you’ll like this free app.