Internal Waves in the Near-Bottom Thermocline and Microdeformations in the Earth's Crust in the Continent-Ocean Transition Zone

摘要

The results of synchronous measurements of temperature variations in a near-bottom thermocline, as well as microdeformations of the Earth's crust and atmospheric pressure pulsing, recorded onshore with the help of a laser strainmeter and laser nanobarograph, are presented. A string containing 20 ther-mosensors spaced at 0.5 m was used; it was placed by an anchored buoy in a place with 21-m depth and 500 m away from the shore. A good correlation between microdeformations and atmospheric pressure variations was observed for periods longer than 6 h. Quantitative estimates and spectral analysis via the Gilbert-Huang method for investigation of nonstationary and nonlinear processes lead to the conclusion that, on temporal scales from tidal to several minutes, the predominant way of formation of microdeformations in the Earth's crust can be breaking of internal waves in a thermocline that leads to shallow water (i.e., in the zone of "internal breakers").