Acquisition and inversion of Love wave data to measure the lateral variability of geo-acoustic properties of marine sediments

Winsborrow, Gavin; Huws, Dei; Muyzert, Everhard

doi:10.1016/j.jappgeo.2003.07.001

Cited by 26 publications

(26 citation statements)

References 19 publications

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“…Love-wave inversion was successfully employed in improving S-wave velocity models (Safani et al 2005) and determining lateral variability of S-wave properties of marine sediments (Winsborrow et al 2003) due to its independence of P-wave. Here, we will demonstrate the effectiveness of inversion of Love wave phase velocity to estimate S-wave velocity.…”

Section: Stable Inversion Of Love Wavesmentioning

confidence: 99%

“…Recent studies on high-frequency Love waves include sensitivity analysis (Zeng et al 2007); improvement of S-wave velocity estimation with Love-wave inversion (Safani et al 2005), inversion of Love waves with a low-velocity layer (Safani et al 2006), joint inversion of geoelectric and Rayleigh-and Love-wave data (Misiek et al 1997), and inversion of Love-wave data to measure the lateral variability of geo-acoustic properties of marine sediments (Winsborrow et al 2003). High-frequency Love-wave modeling (Luo et al 2010) paved the way for inversion of Love waves in the time-space domain.…”

Section: Introductionmentioning

confidence: 99%

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Advantages of Using Multichannel Analysis of Love Waves (MALW) to Estimate Near-Surface Shear-Wave Velocity

et al. 2012

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As theory dictates, for a series of horizontal layers, a pure, plane, horizontally polarized shear (SH) wave refracts and reflects only SH waves and does not undergo wavetype conversion as do incident P or Sv waves. This is one reason the shallow SH-wave refraction method is popular. SH-wave refraction method usually works well defining nearsurface shear-wave velocities. Only first arrival information is used in the SH-wave refraction method. Most SH-wave data contain a strong component of Love-wave energy. Love waves are surface waves that are formed from the constructive interference of multiple reflections of SH waves in the shallow subsurface. Unlike Rayleigh waves, the dispersive nature of Love waves is independent of P-wave velocity. Love-wave phase velocities of a layered earth model are a function of frequency and three groups of earth properties: SH-wave velocity, density, and thickness of layers. In theory, a fewer parameters make the inversion of Love waves more stable and reduce the degree of nonuniqueness. Approximating SH-wave velocity using Love-wave inversion for near-surface applications may become more appealing than Rayleigh-wave inversion because it possesses the following three advantages. (1) Numerical modeling results suggest the independence of P-wave velocity makes Love-wave dispersion curves simpler than Rayleigh waves. A complication of ''Mode kissing'' is an undesired and frequently occurring phenomenon in Rayleigh-wave analysis that causes mode misidentification. This phenomenon is less common in dispersion images of Love-wave energy. (2) Real-world examples demonstrated that dispersion images of Love-wave energy have a higher signalto-noise ratio and more focus than those generated from Rayleigh waves. This advantage is related to the long geophone spreads commonly used for SH-wave refraction surveys, images of Love-wave energy from longer offsets are much cleaner and sharper than for closer offsets, which makes picking phase velocities of Love waves easier and more accurate. (3) Real-world examples demonstrated that inversion of Love-wave dispersion curves is less dependent on initial models and more stable than Rayleigh waves. This is due to Love-wave's independence of P-wave velocity, which results in fewer unknowns in the MALW method compared to inversion methods of Rayleigh waves. This characteristic not only makes Love-wave dispersion curves simpler but also reduces the degree of nonuniqueness leading to more stable inversion of Love-wave dispersion curves.

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Section: Stable Inversion Of Love Wavesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Advantages of Using Multichannel Analysis of Love Waves (MALW) to Estimate Near-Surface Shear-Wave Velocity

et al. 2012

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“…Some applications related to Love waves are also reported in the literature ͑e.g., Mari, 1984;Winsborrow et al, 2003;Guzina and Madyarov, 2005͒, even though ͑a͒ their acquisition requires horizontally polarized sources and receivers and ͑b͒ the extraction of Love-wave dispersion curves from passive data requires sophisticated processing techniques based on combining the two horizontal components. Rayleigh waves are analyzed the most frequently for site characterization because they are easily generated and detected with cheap and readily available equipment traditionally used for gathering seismic refraction data.…”

Section: Surface-wave Typesmentioning

confidence: 99%

5. Engineering and Environmental Geophysics

Socco¹,

Foti²,

Boiero³

2010

Geophysics Today

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Today, surface-wave analysis is widely adopted for building near-surface S-wave velocity models. The surface-wave method is under continuous and rapid evolution, also thanks to the lively scientific debate among different disciplines, and interest in the technique has increased significantly during the last decade. A comprehensive review of the literature in the main scientific journals provides historical perspective, methodological issues, applications, and most-promising recent approaches. Higher modes in the inversion and retrieval of lateral variations are dealt with in great detail, and the current scientific debate on these topics is reported. A best-practices guideline is also outlined.

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“…More specifically, the importance of analyses based also on Love waves, has been treated by Safani et al (2005), Winsborrow et al (2003), Dal Moro and Ferigo (2011) and Dal Moro (2014).…”

Section: Introductionmentioning

confidence: 99%