Estimation of near-surface attenuation using inversion of Rayleigh waves with fundamental and higher modes

2013 ◽  
Author(s):  
Wei Zhao ◽  
Zhenyu Zhu ◽  
Zhipeng Liu ◽  
Yangyang He ◽  
Jinghuai Gao
Keyword(s):  
Rayleigh Waves ◽  
Near Surface ◽  
Higher Modes

Surface-Wave Simulation for the Continuously Moving Seismic Sources

2021 ◽  
Author(s):  
Yuefeng Yan ◽  
Chengyu Sun ◽  
Tengfei Lin ◽  
Jiao Wang ◽  
Jidong Yang ◽  
...  
Keyword(s):  
Rayleigh Waves ◽  
Frequency Dispersion ◽  
Dispersion Curves ◽  
Velocity Estimation ◽  
Surface Velocity ◽  
Seismic Sources ◽  
Near Surface ◽  
Moving Source ◽  
Source Data ◽  
Doppler Effects

Abstract In exploration and earthquake seismology, most sources used in subsurface structure imaging and rock property estimation are fixed in certain positions. Continuously moving seismic sources, such as vehicles and the metro, are one kind of important passive sources in ambient noise research. Commonly, seismic data acquisition and processing for moving sources are based on the assumption of simple point passive sources, and the dispersion curve inversion is applied to constrain near-surface velocity. This workflow neglects the Doppler effects. Considering the continuously moving properties of the sources, we first derive the analytical solution for the Rayleigh waves excited by heavy vehicles and then analyze their Doppler effects and dispersion curves. We observe that the moving source data have the Doppler effect when compared with the changes in the frequency of the source intensity, but this effect does not affect the frequency dispersion of Rayleigh waves. The dispersion curves computed for moving source records are consistent with the analytical dispersion solutions, which provide a theoretical foundation for velocity estimation using moving source data.

Higher Modes of Rayleigh Waves and Upper Mantle Structure

1972 ◽  
pp. 93-100 ◽  
Author(s):  
V. I. Frantsuzova ◽  
A. L. Levshin ◽  
G. V. Shkadinskaya
Keyword(s):  
Upper Mantle ◽  
Rayleigh Waves ◽  
Mantle Structure ◽  
Higher Modes ◽  
Upper Mantle Structure

Feasibility of determiningQof near‐surface materials from Rayleigh waves

2001 ◽  
Author(s):  
Jianghai Xia ◽  
Richard D. Miller ◽  
Choon B. Park ◽  
Julian Ivanov
Keyword(s):  
Rayleigh Waves ◽  
Near Surface ◽  
Surface Materials

Propagation of dispersed compressional and Rayleigh waves on the Texas coastal plain

Geophysics ◽  
1983 ◽  
Vol 48 (1) ◽  
pp. 27-35 ◽  
Author(s):  
Joseph Ebeniro ◽  
Clark R. Wilson ◽  
James Dorman
Keyword(s):  
Coastal Plain ◽  
Rayleigh Waves ◽  
Poisson Ratio ◽  
Normal Modes ◽  
Compressional Wave ◽  
Unconsolidated Sediments ◽  
Near Surface ◽  
Shallow Subsurface ◽  
Strong Surface ◽  
Group Velocities

During a refraction profile on the Texas coastal plain, a strong surface wave with predominant frequencies between 2 and 10 Hz and group velocities near 1.9 km/sec was observed to ranges as great as 64 km. This dispersed wave, with velocities near the compressional wave speed of near‐surface sediments, corresponds to the “leaky” compressional or PL wave. PL dispersion can be predicted from the theory of the normal modes of a layered liquid medium. Efficient propagation of the PL wave is related to the high Poisson ratio of the unconsolidated sediments in the shallow subsurface, and additional examples from the published literature show that the PL wave is commonly excited by shallow sources both on land and offshore. In addition to the PL waves, dispersed waves with group velocities between 0.3 and 0.7 km/sec were observed at ranges less than 10 km. These are identified as Rayleigh waves (LR). Smoothly varying P and S velocity structures for the upper 1 km are obtained by fitting theoretical dispersion curves to the observed PL and LR data.

scholarly journals Characteristics of the horizontal component of Rayleigh waves in multimode analysis of surface waves

Geophysics ◽  
2015 ◽  
Vol 80 (1) ◽  
pp. EN1-EN11 ◽  
Author(s):  
Tatsunori Ikeda ◽  
Toshifumi Matsuoka ◽  
Takeshi Tsuji ◽  
Toru Nakayama
Keyword(s):  
Surface Waves ◽  
Wave Velocity ◽  
Rayleigh Waves ◽  
Field Data ◽  
Vertical Component ◽  
Dispersion Curves ◽  
Horizontal Component ◽  
S Wave ◽  
Higher Modes ◽  
Explosive Source

In surface-wave analysis, S-wave velocity estimations can be improved by the use of higher modes of the surface waves. The vertical component of P-SV waves is commonly used to estimate multimode Rayleigh waves, although Rayleigh waves are also included in horizontal components of P-SV waves. To demonstrate the advantages of using the horizontal components of multimode Rayleigh waves, we investigated the characteristics of the horizontal and vertical components of Rayleigh waves. We conducted numerical modeling and field data analyses rather than a theoretical study for both components of Rayleigh waves. As a result of a simulation study, we found that the estimated higher modes have larger relative amplitudes in the vertical and horizontal components as the source depth increases. In particular, higher-order modes were observed in the horizontal component data for an explosive source located at a greater depth. Similar phenomena were observed in the field data acquired by using a dynamite source at 15-m depth. Sensitivity analyses of dispersion curves to S-wave velocity changes revealed that dispersion curves additionally estimated from the horizontal components can potentially improve S-wave velocity estimations. These results revealed that when the explosive source was buried at a greater depth, the horizontal components can complement Rayleigh waves estimated from the vertical components. Therefore, the combined use of the horizontal component data with the vertical component data would contribute to improving S-wave velocity estimations, especially in the case of buried explosive source signal.

Approximation to Cutoffs of Higher Modes of Rayleigh Waves for a Layered Earth Model

2009 ◽  
Vol 166 (3) ◽  
pp. 339-351 ◽  
Author(s):  
Yixian Xu ◽  
Jianghai Xia ◽  
Richard D. Miller
Keyword(s):  
Rayleigh Waves ◽  
Earth Model ◽  
Higher Modes ◽  
Layered Earth

scholarly journals To the possibility of increasing the efficiency of powerful vibroseismic sources

2019 ◽  
Vol 489 (1) ◽  
pp. 80-83
Author(s):  
A. L. Sobisevich ◽  
R. A. Zhostkov
Keyword(s):  
Parametric Study ◽  
Rayleigh Waves ◽  
Seismic Sources ◽  
Design Features ◽  
Near Surface ◽  
New Approaches ◽  
The Earth ◽  
Numerical Parametric Study

A numerical parametric study of the scattering features of arising from the operation of a vibroseis source Rayleigh waves on near-surface inhomogeneities (seismic barriers) has been performed. In order to find new approaches to the problem of global sensing of the Earth with powerful vibro-seismic sources, the conditions for increasing the efficiency of the emission of volumetric waves due to the design features of seismic barriers were analyzed.

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