Inundation: when a tsunami wave covers normally dry land.
Inundation distance: the distance from the shoreline to the limit of inundation.
Limit of tsunami inundation: the maximum point onshore that the tsunami reached.
Run-up elevation: the elevation above sea level where the tsunami wave terminated.
Sea level: the global average height of the ocean's surface to which all land elevatoins and submarine depths are referred.
Shoreline: the point on the beach corresponding to sea level.
Tsunami elevation: the difference between the wave height and sea level.
Tsunami flow depth: the difference between the wave height and the ground.
Image courtesy of Alaska Earthquake Center.