Today's Earthquake Fact:
During post-tsunami field surveys, inundation and runup
measurements are taken to describe the tsunami effects.
Inundation is defined as the maximum horizontal distance
inland that a tsunami penetrates. Runup is the maximum
vertical height above mean sea level that the sea surface
attains during a tsunami. Actual tsunami wave heights
can be measured from the amplitude of the wave signals
seen on sea level or tide gauge instruments.