Protection for properties can be made by taking following steps:
a) Avoid building or living in building within several hundred feet of the coastline. These areas are more likely to suffer damage from tsunamis, strong winds, or coastal storms.
b) Make a list of items to bring inside in the event of a tsunami. This list help you remember anything missing that can be swept away by tsunami waters.
c) Most tsunami waves are less than 10 feet. So elevating house will help reduce damage to your property from most tsunamis.
d) Consult with a professional for advice to derive waves away from your property.
e) Take help from engineers to check your home and make it more resistant to tsunami water. Improperly built walls may make situation worse.