Chapter 16: Theory of Viscoelastic Love Waves and their Potential Application to Near-surface Sensing of Permeability
Paul Michaels, Vijay Gottumukkula, 2010. "Theory of Viscoelastic Love Waves and their Potential Application to Near-surface Sensing of Permeability", Advances in Near-surface Seismology and Ground-penetrating Radar, Richard D. Miller, John H. Bradford, Klaus Holliger
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In computing Love-wave solutions, the choice of constitutive model depends on the domain of application. In the domain of global earthquake seismology, the search for solutions in the complex plane began in the vicinity of the elastic solutions. In the case of near-surface engineering work, damping levels can be large, and elastic stiffness can be much less than in global seismology. Furthermore, the choice of representation should depend on the permeability and degree of water saturation. The study of dry or impermeable soils and rock, where viscous effects are largely absent, has led to an alternative representation for the Kelvin-Voigt damping property. Under that alternative of effective viscosity, the damping ratio is a frequency-independent soil constant. Permeable, water-saturated soils, on the other hand, have shown viscous behavior. A method to solve for Love waves can be used under a truly viscous assumption. Applications would include near-surface remote sensing of either water content or permeability.
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Near-surface seismology and ground-penetrating radar (GPR) have enjoyed success and increasing popularity among a wide range of geophysicists, engineers, and hydrologists since their emergence in the latter half of the twentieth century. With the common ground shared by near-surface seismology and GPR, their significant upside potential, and rapid developments in the methods, a book bringing together the most current trends in research and applications of both is fitting and timely. Conceptually, near-surface seismology and GPR are remarkably similar, and they share a range of attributes and compatibilities that provides opportunities to integrate processing and interpretation workflows, which makes them a perfect pair to share pages in a book.
With growth in numbers and professional emphasis have come sections, focus groups, and even professional societies specifically promoting near-surface geophysics. The emergence of near-surface geophysics groups, beginning in the late 1990s and extending into the early twenty-first century, has fueled a diversity of opportunities for professional collaborations. A range of workshops and shared publications has been the fruit of collaborative efforts. The near-surface community continues to extend and develop methods and approaches necessary to satisfy increasing demands in some of the socioeconomically pertinent disciplines such as civil and environmental engineering and hydrology. This book represents the first formal cooperative effort undertaken by the near-surface communities of the Society of Exploration Geophysicists, the American Geophysical Union, and the Environmental and Engineering Geophysical Society.