Samiksha Jaiswal (Editor)

Meteotsunami

Updated on
Edit
Like
Comment
Share on FacebookTweet on TwitterShare on LinkedInShare on Reddit
Meteotsunami

A meteotsunami or meteorological tsunami is a tsunami-like wave of meteorological origin. Meteotsunamis are generated when rapid changes in barometric pressure cause the displacement of a body of water. In contrast to "ordinary" impulse-type tsunami sources, a traveling atmospheric disturbance normally interacts with the ocean over a limited period of time (from several minutes to several hours). Tsunamis and meteotsunamis are otherwise similar enough that it can be difficult to distinguish one from the other, as in cases where there is a tsunami wave but there are no seismic records of an earthquake.

Only about 3% of historical tsunami events (from 2000 BC through 2014) are known to have meteorological origins, although their true prevalence may be considerably higher than this because 10% of historical tsunamis have unknown origins, tsunami events in the past are often difficult to validate, and meteotsunamis may have previously been misclassified as seiche waves.

Meteotsunamis are restricted to local effects because they lack the energy available to significant seismic tsunami. However, when they are amplified by resonance they can be hazardous. A meteotsunami that struck Nagasaki Bay on 31 March 1979 achieved a maximum wave height of 5 meters; there were three fatalities. A three-meter wave that hit the Chicago waterfront in 1954 swept people off of piers, drowning seven.

In some parts of the world, they are common enough to have local names: rissaga (Catalan), ressaca (Portuguese), milghuba (Maltese), marrobbio (Italian), abiki (Japanese), šćiga (Croatian). Some bodies of water are more susceptible than others, including anywhere that the natural resonance frequency matches that of the waves, such as in long and narrow bays, particularly where the inlet is aligned with the oncoming wave. Examples of particularly susceptible areas include Nagasaki Bay, the eastern Adriatic Sea, and the Western Mediterranean.

References

Meteotsunami Wikipedia