Geografie 1971, 76, 134-143

https://doi.org/10.37040/geografie1971076020134

Tsunami - A Transformed Tectonic Movement

Ludvík Loyda

Výzkumný ústav geodetický, kartografický a topografický, Dražického nám. 1, Praha 1, Malá Strana, Czechia

Main characteristics of tsunamis are described here - height and length of waves, speed of travel, period of oscillation etc. The author presumes the tsunami waves follow the block movements of the earth's crust. The beginning of a tsunami is invariable - either the sea water overflows suddenly the coast (following initial upward movement of blocks) or the arrival of a tsunami wave is preceded by a withdrawal of sea (following initial sinking of blocks). The initial movement of the sea water on the coast reflects and transforms only the character of tectonic movements in the adjacent place of the sea-bottom activity. The transgression and/or regression of seawater depends on time when tectonic movements originate. Tlhus the water movement gets complicated.