Transient scattering of Rayleigh waves by surface-breaking and sub-surface cracks

Liu, Shaw-Wen; Sung, J.C.; Chang, Ching-Sen

doi:10.1016/0020-7225(95)00143-3

Cited by 12 publications

(5 citation statements)

References 13 publications

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“…Large diffractions are produced by surface and subsurface cracks: in 2D, they can reflect almost totally the energy in a certain range of wavelengths (Achenbach, Gautesen and Mendelssohn ; Mendelssohn et al . ; Liu, Sung and Chan ; Rodriguez‐Castellano, Ávila‐Carrera and Sánchez‐Sesma ). In a homogeneous material, a surface breaking crack can produce a 25% scattering on a wavelength 10 times longer than its height (Pecorari ).…”

Section: Review Of Surface‐wave Scatteringmentioning

confidence: 99%

Model‐based attenuation for scattered dispersive waves

Strobbia

Zarkhidze²,

May³

et al. 2014

Geophysical Prospecting

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Coherent noise in land seismic data primarily consists in source‐generated surface‐wave modes. The component that is traditionally considered most relevant is the so‐called ground roll, consisting in surface‐wave modes propagating directly from sources to receivers. In many geological situations, near‑surface heterogeneities and discontinuities, as well as topography irregularities, diffract the surface waves and generate secondary events, which can heavily contaminate records. The diffracted and converted surface waves are often called scattered noise and can be a severe problem particularly in areas with shallow or outcropping hard lithological formations. Conventional noise attenuation techniques are not effective with scattering: they can usually address the tails but not the apices of the scattered events. Large source and receiver arrays can attenuate scattering but only in exchange for a compromise to signal fidelity and resolution. We present a model‑based technique for the scattering attenuation, based on the estimation of surface‐wave properties and on the prediction of surface waves with a complex path involving diffractions. The properties are estimated first, to produce surface‑consistent volumes of the propagation properties. Then, for all gathers to filter, we integrate the contributions of all possible diffractors, building a scattering model. The estimated scattered wavefield is then subtracted from the data. The method can work in different domains and copes with aliased surface waves. The benefits of the method are demonstrated with synthetic and real data.

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Section: Review Of Surface‐wave Scatteringmentioning

confidence: 99%

Model‐based attenuation for scattered dispersive waves

Strobbia

Zarkhidze²,

May³

et al. 2014

Geophysical Prospecting

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“…However, it is now understood that they can have a considerable impact at a closer distance (within a few tens of kilometers). Awareness of these issues can help determine the realistic levels of vulnerability of existing buildings, leading to the safe design of structures on the ground [37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

A numerical study on effect of underground cavities on seismic ground response due to Rayleigh wave propagation

2023

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Recent studies found that some structural damage can be attributed to the effect of surface waves. A shallow underground structure may be heavily influenced by surface waves, which makes to lose energy over distance more slowly than body waves. This study deals with evaluating the effect of Rayleigh waves (R-waves) interaction with underground cavities on the seismic ground response and amplification pattern using the Finite Element Method (FEM). First, the FEM model was verified to ensure its accuracy. Then, the influences of the effective parameters, such as cavity burial depth, distance from the cavity axis, and dimensionless incident frequency were investigated. Parametric studies revealed that the amplitude of ground motion is greater in the presence of a cavity with respect to that in the free-field condition. It was indicated that shallow cavities cause more amplification than cases with a larger depth ratio. By moving away from the wave source, the response of receiver points has a declining trend. Due to the complex interaction of R-waves with a cavity, the right side of the cavity has less amplitude than the left side. Finally, by increasing the dimensionless incident frequency, the distribution of the surface displacements and wave diffraction patterns gradually becomes more complicated while the peak displacement components decrease. Consequently, in light of the importance of the R-wave interaction with subsurface spaces, the findings of this study can help improve seismic design procedures and seismic microzonation guidelines.

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“…However, only relatively recently the expression for the speed of Rayleigh waves was provided explicitly by Rahman & Barber (1995) and, incidentally, we report here a compact form of this explicit solution. Chandrasekharaiah (1987) has studied the effects of voids on the propagation of Rayleigh waves in elastic half-spaces, whereas Liu et al (1996) and Wang et al (2019) considered the influence of cracks on these wave processes. In addition, the propagation of such surface states has been investigated for different types of media, for instance, see the work of Chiri & Ghiba (2012) for Cosserat materials, Akbarov & Ozisik (2003) for pre-stressed and Vinh & Giang (2010) for pre-strained materials.…”

Section: Introductionmentioning

confidence: 99%

Rayleigh waves in micro-structured elastic systems: Non-reciprocity and energy symmetry breaking

Movchan

Carta

Pagneux

et al. 2020

International Journal of Engineering Science

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Rayleigh waves are analysed in gyroscopic elastic systems. The in-plane vector problems of elasticity for a triangular lattice and its long-wavelength/ low-frequency continuum approximation are considered. The analytical procedure for the derivation of the Rayleigh dispersion relation is fully detailed and, remarkably, explicit solutions for the Rayleigh waves for both the discrete and continuous systems are found. The dispersion at low wavenumbers and the softening induced by the gyricity are shown. Despite of the symmetry of the dispersion curves with respect to the wavenumber, the presence of the gyroscopic effect breaks the symmetry of the eigenmodes and makes the system non-reciprocal. Such an uncommon effect is demonstrated in a set of numerical computations, where a point force applied on the boundary generates surface and bulk waves that do not propagate symmetrically from the source.

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Transient scattering of Rayleigh waves by surface-breaking and sub-surface cracks

Cited by 12 publications

References 13 publications

Model‐based attenuation for scattered dispersive waves

Model‐based attenuation for scattered dispersive waves

A numerical study on effect of underground cavities on seismic ground response due to Rayleigh wave propagation

Rayleigh waves in micro-structured elastic systems: Non-reciprocity and energy symmetry breaking

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