historical tsunami data Historical data are available in many forms and at many locations. The forms include published and manuscript catalogs of tsunami occurrences, marigraphs, tsunami amplitude, run-up and inundation zone measurements, field investigate reports, newspaper accounts, film or video records.

horizontal inundation Distance between the inundation line and the shore, generally measured perpendicularly to the shore.

hydraulic model A physical scale model of a basin or a harbor used to simulate effects of wave action or flooding caused by hurricane surge or tsunami wave activity.

hydraulic modeling Mathematical formulations used in connection with a hydraulic physical model to simulate natural hydrologic phenomena which are considered as processes or as systems.