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Nonlinear oscillating structures in the earthquake and seaquake dynamics
1P. P. Shirshov Oceanology Institute of Russian Academy of Science, 23 Krasikova Str., 117218, Moscow, Russia.
Chaos (Woodbury, N.Y.)
|September 1, 1996
Summary
This study models seaquakes, explaining them as large water surface disturbances caused by ocean earthquakes. Laboratory experiments revealed wave patterns similar to Faraday ripples, offering insights into wave structures and chaos transitions.
Area of Science:
- Geophysics and Fluid Dynamics
- Structural Dynamics and Wave Phenomena
Background:
- Earthquakes and seaquakes can induce parametric excitation in oscillating structures.
- Tidal forces are investigated as potential triggers for earthquakes.
- Seaquakes are characterized as significant ocean surface disturbances originating from seismic activity on the ocean floor.
Purpose of the Study:
- To model seaquake phenomena through laboratory experiments.
- To investigate the relationship between earthquakes, seaquakes, and parametric excitation.
- To analyze the transition from ordered wave structures to chaotic behavior in seaquake models.
Main Methods:
- Laboratory modeling of seaquake-induced wave patterns.
- Analysis of wave structures, including hexagonal and square cells, resembling Faraday ripples.
- Experimental determination of parameters governing the transition from wave structures to chaos.
Main Results:
- Observed wave lattices with cell sizes ranging from 15 to 120 mm.
- Identified similarities between laboratory-generated wave patterns and natural seaquake phenomena.
- Established parameters for the transition from wave structure to chaotic states.
Conclusions:
- Laboratory seaquake modeling supports the interpretation of seaquakes as large-scale structural disturbances.
- Experimental data align with parametric wave theory and observations of full-scale seaquakes.
- The study provides a framework for understanding the complex dynamics of seaquakes and their impact on structures.