1) Tsunamis are large ocean waves caused by sudden displacement of water, often due to earthquakes, landslides or volcanic eruptions. 2) Upon reaching shore, tsunami waves can break and reach heights far exceeding normal sea levels, potentially causing coastal inundation of tens of meters. 3) To escape a tsunami, take earthquakes occurring near shore as an alert to immediately evacuate to high ground, bringing a survival kit and staying away from evacuation routes exposed to tsunami waves or secondary hazards.