Tsunamigenic earthquakes, registration and interpretation of the data
The records of laser strainmeters, containing information about four tsunamigenic earthquakes which occurred in various areas of the Pacific ocean are analyzed. It is established that only on record of one earthquake the deformation jump, caused by seabed motions which led to formation of a tsunami is observed. The absence of the same signals on records of other earthquakes is explained by the predominance of dispersion over nonlinearity during distribution of signals from their origin places to cape Schultz. According to dispersive curves of these earthquakes, some possible sources of the recorded signals and individual earthquake characteristics are analyzed. A new method is proposed of studying the influence of the atmosphere pressure variations on the level of micro deformation of the earth’s crust in the location area of the laser strainmeters. Application of this method allowed allocating surely separate tone and an overtone of natural oscillations of Earth after one of earthquakes.