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It's an elastic wave in the earth produced by an earthquake or other means. hope it helps!
Storms are one of the major hazards that are associated to coastal regions. Storms, flooding, and erosion are closely associated and can happen simultaneously. Tropical storms or Hurricanes especially can devastate coastal regions.They typically weaken rapidly over land surface where they are cut off from their primary energy source, for this reason coastal regions are particularly vulnerable to damage caused by the tropical cyclone as compared to inland regions.The destruction from a tropical cyclone, such as a hurricane or tropical storm, depends mainly on its intensity, its size, and its location. Tropical cyclones remove forest canopy as well as change the landscape near coastal areas, by moving and reshaping sand dunes and causing extensive erosion along the coast.
