Detection of Shallow Underground Cavities by Seismic Methods: Physical Modelling Approach

Pernod, Philippe; Piwakowski, Bogdan; Delannoy, B.; Tricot, J. C.

doi:10.1007/978-1-4613-0791-4_74

Cited by 5 publications

(1 citation statement)

References 3 publications

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“…In (6) A(x,y) stays for the modulus of the incoming illuminating wave amplitude at the z=O plane. In case of seismic (or acoustical, in general ) hologram, the integral (4) may be represented by its discrete form: f= hk exp{i 2rc(kn)/N} (7) viicic Kn iiieaiis scaiar prouuci iui = n't'im oi pairs K9K.J) ana n=n.m).…”

Section: The Image Reconstruction In Acoustical Holographymentioning

confidence: 99%

<title>Near-surface 3D visualization of underground structures by means of seismic holography</title>

Motyka

2000

Fourth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications

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The records of the acoustical holography imaging of 60 cm concrete cube model have been taken with the predetermined model lead intrusions. Both phase and amplitude holograms were obtained. Their numerical reconstmction enabled to visualize the cross-shaped structure of this model intrusion. The records for seismic imaging of near-surface objects were taken in the region of Barbara Experimental Mine, Mikolow, Upper Silesia region, Poland. The method of seismic transmission holography was used. The explosives were detonated at one point on the depth of 40 m and signals were recorded on the surface lattice of 21 x 21 points on 50m square. These signals were further processed to obtain phase and amplitude holographic data. The seismic holograms synthesised in such a way were then numerically reconstructed. The Z-shaped image of the part of mine's gallery on the depth of 20 m was obtained.

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Section: The Image Reconstruction In Acoustical Holographymentioning

confidence: 99%

<title>Near-surface 3D visualization of underground structures by means of seismic holography</title>

Motyka

2000

Fourth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications

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Contour Detection of Underground Cylindrical Cavities by Means of Acoustic Pulse Reflection Method

Yoshida¹,

Yamada

1993

Jpn. J. Appl. Phys.

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A method for shallow underground cavity exploration based on the acoustic pulse reflection method using a sound source with a finite width in space is studied. The medium is assumed to be a half-space with a cylindrical cavity buried shallow underground, and an acoustic pulse with a normal stress is applied to the free surface. The scattered waves generated at the cavity boundary, observable at the receiver located at the surface, are calculated by the finite difference method. Using the scattered waves, the outer boundaries of the cavity contour are detected highly accurately by regarding the sound source as an array of the point sources.

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An Open-Access Data Set of Active-Source and Passive-Wavefield DAS and Nodal Seismometer Measurements at the Newberry Florida Site

Abbas,

Cox,

Tran

et al. 2024

Seismological Research Letters

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This article documents a comprehensive subsurface imaging experiment using seismic waves in a well-studied outdoor laboratory at Newberry, Florida, which is known for significant spatial variability, karstic voids, and underground anomalies. The experiment used approximately two kilometers of distributed acoustic sensing (DAS) fiber-optic cable, forming a dense 2D array of 1920 horizontal-component channels, and a 2D array of 144 SmartSolo three-component nodal seismometers, to sense active-source and passive-wavefield seismic waves. The active-source data were generated using a powerful, triaxial vibroseis shaker truck (T-Rex) and impact sources (accelerated weight drop and an eight-pound sledgehammer) that were simultaneously recorded by both the DAS and nodal seismometers. The vibroseis truck was used to excite the ground in three directions (two horizontal and one vertical) at 260 locations inside and outside the instrumented array, whereas the impact sources were used at 268 locations within the instrumented array. The passive-wavefield data recorded using the nodal seismometers comprised 48 hr of ambient noise collected over a period of four days in four 12-hour time blocks, whereas the passive wavefield data collected using DAS consisted of four hours of ambient noise recordings. This article aims to provide a comprehensive overview of the testing site, experiment layout, the DAS and nodal seismometer acquisition parameters, and implemented raw data processing steps. Although potential use cases, such as surface-wave testing, full-waveform inversion, and ambient noise tomography, are discussed relative to example data, the focus of this article is on documenting this unique data set and presenting its initial data quality rather than on generating subsurface imaging results. The raw and processed data, along with detailed documentation of the experiment and Python tools to aid in visualizing the DAS data set, have been made publicly available.

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Detection of Shallow Underground Cavities by Seismic Methods: Physical Modelling Approach

Cited by 5 publications

References 3 publications

<title>Near-surface 3D visualization of underground structures by means of seismic holography</title>

<title>Near-surface 3D visualization of underground structures by means of seismic holography</title>

Contour Detection of Underground Cylindrical Cavities by Means of Acoustic Pulse Reflection Method

An Open-Access Data Set of Active-Source and Passive-Wavefield DAS and Nodal Seismometer Measurements at the Newberry Florida Site

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