Seismoacoustics in Arctic seas: fundamental principles for improving monitoring technologies

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The results of the development of scientific foundation of technology for passive geohydroacoustic monitoring of Arctic seas are presented, including theoretical studies of the conditions for the origin and propagation of wave fields generated by induced geodynamic processes in the layered structure “lithosphere – hydrosphere – ice cover”, the solution of a separate class of problems within the framework of a fundamental scientific problem, related to the search for innovative, environmentally safe geophysical technologies to outline the local heterogeneities, as well as the creation of prototypes, laboratory and full-scale testing of prototypes of new generation ice-based geohydroacoustic buoys. The method for estimating parameters of floating ice (thickness, density, Young’s modulus, Poisson’s ratio) in passive mode was proposed and tested in a field experiment. Particular attention is paid to the state of scientific and practical groundwork regarding the possibilities of developing methods for passive geohydroacoustic monitoring of the Arctic seas.

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A. Sobisevich

Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences

编辑信件的主要联系方式.
Email: sobisevich@yandex.ru

член-корреспондент РАН, заведующий лабораторией 703

俄罗斯联邦, Moscow

V. Dmitrichenko

JSC Concern “Sea Underwater Weapon Gidropribor”

Email: dmitrichenko-v@yandex.ru

кандидат технических наук, начальник отделения

俄罗斯联邦, St. Petersburg

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2. Fig. 1. Results of numerical simulation of a random noise field received by two receivers spaced on a plane a – spatial distribution of random noise sources (points) relative to receivers (triangles); b – intercorrelation functions of two receivers spaced apart, which are obtained taking into account the contribution of various groups of sources marked with the appropriate color; vertical black lines correspond to true propagation times of signals between receivers [18]

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3. Fig. 2. Layout of a frozen geohydroacoustic information and measurement buoy (a) and amplitude-frequency and phase-frequency characteristics of molecular electronic seismic receivers (CME-4211V) and reference pendulum seismic receivers Guralp (CMG-3ESP) and Streckeisen (STS-1V/VBB) (b) 1 - primary converter; 2 – elements power supply; 3 – digital recorder and electronics unit

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4. Fig. 3. Dispersion dependences of the main modes of the seismohydroacoustic field at a reservoir depth of 30 m and an ice thickness of 1 m (a) and dispersion curves of bending-gravitational waves for different values of ice thickness (b) [18]

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5. Fig. 4. The scheme of experiments in ice conditions 1 – a model of a geohydroacoustic buoy; 2 – a vector piezoceramic receiver; 3 – a CM3-OS pendulum seismometer; 4 – a bottom molecular electronic seismic receiver; 5 - a hydrophone; 6 – a digital recorder; 7, 9 – pulse effects on the ice surface and on the bottom; 8 – a pulse source in the water column

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6. Fig. 5. An example of synchronous recording of a signal from a pulse source by seismometers at the bottom (bottom) and on the ice surface (top)

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