Pacific-wide tsunami A tsunami capable of widespread destruction, not only in the immediate region of its generation, but across the entire Pacific Ocean. 1960 Damaged caused by the May 22,1960 Chilean Tsunami

paleotsunami Research on paleotsunamis, events occurring prior to the historical record, has recently been taking place in afew regions around the Pacific. This work is based primarily on the collection and analysis of tsunami deposits found in coastal areas, and other evidence related to the uplift or subsidence associated with nearby earthquakes. In one instance, the research has led to a new concern for the possible future occurrence of great earthquakes and tsunamis along the northwest coast of North America. In another instance, the record of tsunamis in the Kuril-Kamchatka region is being extended much further back in time. As work in this field continues it may provide a significant amount of new information about past tsunamis to aid in the assessment of the tsunami hazard.

post-tsunami survey  Tsunamis are relatively rare events and most of their evidence is perishable. Therefore, it is very important that reconnaissance surveys be organized and carried out quickly and thoroughly after each tsunami occurs, to collect detailed data valuable for hazard assessment, model validation, and other aspects of tsunami mitigation. In recent years, following each major destructive tsunami, a post-tsunami reconnaissance survey has been organized to make measurements of runups and inundation limits and to collect associated data from eyewitnesses such as the number of waves, arrival time of waves, and which wave was the largest. The surveys have been organized primarily on an ad-hoc basis by academic tsunami researchers, with participants of ten gathered from several of the ITSU Member States. A Post-Tsunami Survey Field Guide  has been prepared by ITSU to help with preparations for surveys, to identify measurements and observations that should be taken, and to standardize data collection methods for increased consistency and accuracy.

probable maximum water level A hypothetical water level (exclusive of wave runup from normal windgenerated waves) that might result from the most severe combination of hydrometeorological, geoseismic and other geophysical factors that is considered reasonably possible in the region involved, with each of these factors considered as affecting the locality in a maximum manner. This level represents the physical response of a body of water to maximum applied phenomena such as hurricanes, moving squall lines, other cyclonic meteorological events, tsunamis, and astronomical tide combined with maximum probable ambient hydrological conditions such as wave level with virtually no risk of being exceeded.

PTWC PTWC Pacific Tsunami Warning Center. PTWC is the headquarters of the operational Tsunami Warning System (TWS) in the Pacific and works closely with other regional national centers in monitoring seismological and tidal stations and instruments around the Pacific Ocean, to evaluate potentially tsunamigenic earthquakes. PTWC is operated by the United States National Weather Service. Operations area of the Pacific Tsunami Warning Center in Ewa Beach, Hawaii. PTWC facilities located at Ewa Beach,Hawaii,USA.

PTWS Pacific Tsunami Warning System. PTWS is the operational Tsunami Warning System in the Pacific. Tsunami Warning System Sea Level Gauges