Observation and inversion of seismo-acoustic waves in a complex Artic ice environment

Miller, Bruce E.

doi:10.1575/1912/5416

Cited by 3 publications

(4 citation statements)

References 21 publications

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“…In the past century, there has been a great deal of research conducted regarding seismoacoustic propagation in multilayered media such as air, ice, and water. In floating ice sheets, the theory of wave propagation is well developed [1][2][3][4][5][6][7] and has been corroborated by several experiments [8][9][10][11][12][13][14][15]. Typically, seismo-acoustic research in floating ice layers focuses on propagation time, phase velocity, and group velocity of various types of waves such as P-waves (compression wave), S-waves (transverse shear wave), Rayleigh waves (flexural surface wave), and Love waves (shear surface wave).…”

Section: Introductionmentioning

confidence: 99%

Multi-modal and short-range transmission loss in ice-covered, near-shore Arctic waters

Penhale

Barnard

2017

The Journal of the Acoustical Society of America

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In the past century, extensive research has been done regarding the sound propagation in arctic ice sheets. The majority of this research has focused on low frequency propagation over long distances. One of the most commonly used excitation methods for air-icewater layers has been explosives. However, environmental regulation has become more stringent, disallowing the use of almost all explosive excitation types. Due to changing climate conditions in these environments, new experimentation is warranted to determine sound propagation characteristics in, through, and under thin ice sheets, in shallow water, over short distances. In April, 2016 several experiments were conducted approximately 2 km off the coast of Barrow, Alaska on shore-fast, first year ice, approximately 1 m thick. To determine the propagation characteristics of various sound sources, Frequency Response Functions (FRFs) were measured between a source location and several receiver locations at various distances from 1 m to 1 km. The primary sources used for this experiment were, an underwater speaker with various tonal outputs, an instrumented impact-hammer on the ice, and a propane cannon that produced an acoustic blast wave in air. The transmission characteristics of the multipath propagation (air, ice, water) are investigated and reported.

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Section: Introductionmentioning

confidence: 99%

Multi-modal and short-range transmission loss in ice-covered, near-shore Arctic waters

Penhale

Barnard

2017

The Journal of the Acoustical Society of America

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“…In the past century, there has been a great deal of research conducted regarding acoustic propagation in multilayered media such as air, ice, and water. In floating ice sheets, the theory of wave propagation is well developed [3][4][5][6][7][8][9][10][11][12] and has been corroborated by several experiments [13][14][15][16][17][18][19][20] . With the exception of a few studies 12,17 , the majority of this research focuses on low frequency (approximately less than 100 Hz) propagation over long-ranges (generally greater than 1 km).…”

Section: Introductionmentioning

confidence: 97%

“…Early experiments often excited layered media with explosives 3,4,14,17,19 . This excitation method is now less common due to environmental regulation on explosive acoustic sources 29 .…”

Section: Introductionmentioning

confidence: 99%

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Acoustic Localization Techniques for Application in Near-Shore Arctic Environments

Penhale¹

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Seismic‐acoustic sensing of sea ice wave mechanical properties

Xie¹,

Farmer²

1994

J. Geophys. Res.

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Sea ice inhomogeneities can be probed by seismic and acoustic waves. Observations of the seismic-acoustic response of first-year sea ice to artificially generated impacts created by dropping a lead ball from a fixed height show that an ice ridge in the path of a propagating seismic wave dampens the wave. This damping effect is found to be sensitive to the angle of incidence, especially at high frequencies (• 100 Hz). Both the longitudinal (P wave) and horizontally polarized shear (SH) wave speeds are found to be much more variable in the vicinity of the ridge; outside of the ridged area the shear wave speed is relatively uniform, varying by only 13% in contrast to the 27% variability of the P wave speed. The Crary wave, which is a special case of the vertically polarized wave (SV), is most easily induced by seafloor-reflected acoustic waves penetrating the ice at large grazing angles. When an ice sheet is struck with a vertical blow, it radiates sound with a dipole pattern; the radiated frequency also depends on the radiation angle with higher-frequency energy projected preferentially downward. Most of the potential energy resulting from artificial impacts is dissipated through damaging the ice surface, with only a small fraction being converted into acoustic and seismic waves.

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Observation and inversion of seismo-acoustic waves in a complex Artic ice environment

Cited by 3 publications

References 21 publications

Multi-modal and short-range transmission loss in ice-covered, near-shore Arctic waters

Multi-modal and short-range transmission loss in ice-covered, near-shore Arctic waters

Acoustic Localization Techniques for Application in Near-Shore Arctic Environments

Seismic‐acoustic sensing of sea ice wave mechanical properties

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