Effective dispersion curve and pseudo multimode dispersion curves for Rayleigh wave

Zhang, Shuangxi

doi:10.1007/s12583-011-0175-8

Cited by 7 publications

(3 citation statements)

References 12 publications

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“…The dispersion curve extracting is highly dependent on subjective judgement and experience. When geological conditions are complex, energy mixing and pseudo multi-mode may happen (Zhang, 2011), it's difficult to extract accurate dispersion curve manually. In addition, because the theoretical dispersion curve is based on the assumption of 1D flat layered model (Knopoff, 1964), dispersion curve inversion can only solve the problem of horizontal layered media, which is often not the case in real strata.…”

Section: Introductionmentioning

confidence: 99%

A Rayleigh Wave Globally Optimal Full Waveform Inversion Framework Based on GPU Parallel Computing

Le¹,

Zhang²,

Xiao³

et al. 2023

GEP

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Conventional gradient-based full waveform inversion (FWI) is a local optimization, which is highly dependent on the initial model and prone to trapping in local minima. Globally optimal FWI that can overcome this limitation is particularly attractive, but is currently limited by the huge amount of calculation. In this paper, we propose a globally optimal FWI framework based on GPU parallel computing, which greatly improves the efficiency, and is expected to make globally optimal FWI more widely used. In this framework, we simplify and recombine the model parameters, and optimize the model iteratively. Each iteration contains hundreds of individuals, each individual is independent of the other, and each individual contains forward modeling and cost function calculation. The framework is suitable for a variety of globally optimal algorithms, and we test the framework with particle swarm optimization algorithm for example. Both the synthetic and field examples achieve good results, indicating the effectiveness of the framework.

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Section: Introductionmentioning

confidence: 99%

A Rayleigh Wave Globally Optimal Full Waveform Inversion Framework Based on GPU Parallel Computing

Le¹,

Zhang²,

Xiao³

et al. 2023

GEP

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show abstract

“…Under many geologic conditions, fundamental and higher modes may be difficult to identify, isolate, and measure (Ivanov et al, 2011;Dal Moro et al, 2015), and work has been done to better isolate the fundamental and higher Rayleigh-wave modes (Luo et al, 2009). In the case of higher modes interfering with the fundamental mode, Zhang (2011) presents a method that models the effective dispersion curve measured due to interference. In the same vain as previous researchers, we present a new method to improve the measurement of individual mode velocity dispersion for the fundamental and higher mode Rayleigh waves by isolating wavefields based on particle motions.…”

Section: Introductionmentioning

confidence: 99%

Isolating retrograde and prograde Rayleigh-wave modes using a polarity mute

et al. 2016

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Estimates of S-wave velocity with depth from Rayleighwave dispersion data are limited by the accuracy of fundamental and/or higher mode signal identification. In many scenarios, the fundamental mode propagates in retrograde motion, whereas higher modes propagate in prograde motion. This difference in particle motion (or polarity) can be used by joint analysis of vertical and horizontal inline recordings. We have developed a novel method that isolates modes by separating prograde and retrograde motions; we call this a polarity mute. Applying this polarity mute prior to traditional multichannel analysis of surface wave (MASW) analysis improves phase velocity estimation for fundamental and higher mode dispersion. This approach, in turn, should lead to improvement of S-wave velocity estimates with depth. With two simple models and a field example, we have highlighted the complexity of the Rayleigh-wave particle motions and determined improved MASW dispersion images using the polarity mute. Our results show that we can separate prograde and retrograde signals to independently process fundamental and higher mode signals, in turn allowing us to identify lower frequency dispersion when compared with single component data. These examples demonstrate that the polarity mute approach can improve estimates of S-wave velocities with depth.

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“…Rayleigh wave detection mainly uses dispersion characteristics of Rayleigh wave propagating in different medium to explore the stratigraphic structure. This feature mainly contains two aspects of content [2]. Firstly, in the same homogeneous medium, dispersion phenomenon would not happen to the propagation of Rayleigh wave, which means that the velocity of Rayleigh wave engendered under different frequency does not change when propagating in the same homogeneous medium.…”

mentioning

confidence: 99%

Applications of Rayleigh Wave Detection Technique and Polymer Grouting Technology in Waterproof Construction

Chen

Ummin

Yu³

et al. 2013

AMM

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The underground water seepage is always the key and difficult point in waterproof engineering. Aiming at the characteristics of underground engineering waterproof, this paper describes how to make use of Rayleigh wave detection technology to detect leakage in underground works, and find disease location through the analysis of the dispersion curve, and then combine Rayleigh wave detection technology with polymer grouting technique grouting on the disengaging position, to achieve the effect of waterproof plugging. Research results show that through combining Rayleigh wave detection technique and the combination of polymer grouting technology, it is quicker and more convenient to manage underground leakage defects, which satisfies the project need and has wide application value and social benefits.

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Effective dispersion curve and pseudo multimode dispersion curves for Rayleigh wave

Cited by 7 publications

References 12 publications

A Rayleigh Wave Globally Optimal Full Waveform Inversion Framework Based on GPU Parallel Computing

A Rayleigh Wave Globally Optimal Full Waveform Inversion Framework Based on GPU Parallel Computing

Isolating retrograde and prograde Rayleigh-wave modes using a polarity mute

Applications of Rayleigh Wave Detection Technique and Polymer Grouting Technology in Waterproof Construction

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