Which describes the waves formed by tsunamis

Answer 1

Tsunamis are formed by large undersea earthquakes or volcanic eruptions, and the waves they create are typically referred to as long-period seismic sea waves. These waves have extremely long wavelengths and travel at high speeds across the ocean, reaching heights of up to 30 meters (100 feet) when they approach the coastline. Unlike most ocean waves, tsunamis have a lower wave height-to-wavelength ratio and can travel across entire ocean basins without significant loss of energy. As they approach the coastline, the tsunami waves may experience shoaling, causing them to slow down and increase in height, resulting in the destructive impact that is commonly associated with tsunamis.