High Resolution Seismic Reflection Methods to Detect Near Surface Tuff-Cavities: A Case Study in the Neapolitan Area, Italy

Fiore, Vincenzo Di; Angelino, Antimo; Passaro, Salvatore; Bonanno, A.

doi:10.4311/2011es0248

Cited by 10 publications

(3 citation statements)

References 15 publications

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“…This may be due to the fact that the cavity is small compared to the wavelength or because the soil stratification has a bigger influence on traveltime compared to cavity perturbation. The principle of seismic reflection can be effective for imaging deep cavities but for shallow depths, that is the subsurface geotechnical zone, the events reflected are often masked by surface waves (Miller et al 1991;Fiore et al 2013;Sloan et al 2015). This last point makes the extraction of cavity-related information from raw data difficult.…”

Section: Introductionmentioning

confidence: 99%

New robust observables on Rayleigh waves affected by an underground cavity: from numerical to experimental modelling

Filippi

Leparoux²,

Grandjean

et al. 2019

Geophysical Journal International

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The investigation and monitoring of shallow hazards due to the presence of underground cavities remain a challenge for geophysical approaches. Thus, seismic surface waves have been tested in several recent research projects in order to detect and localize voids as well as to determine their geometries. Among these works, numerous numerical studies have proved the feasibility of Rayleigh waves to detect cavities. However, most imagery processes adapted to R waves are faced with difficulties when applying them to real data. This limitation points to a major problem: the interactions between Rayleigh waves and a cavity are complex, particularly in the case of dispersing and attenuating surrounding media. Here, a combined approach based on numerical and experimental data obtained in a reduced-scale measurement bench is conducted to better understand the seismic wave propagation phenomena involved in the presence of a cavity and define robust observables that can be used in field measurements. The observables bearing the cavity signature are studied qualitatively and quantitatively on numerical and experimental recordings. The latter take into account all the propagation phenomena involved. The observations are carried out on the vertical and horizontal component of the Rayleigh wave displacement. The selected observables are studied depending on nondimensional cavity's parameters versus the frequency, that is the wavelength-to-size ratio and the wavelength-to-depth ratio. The effects of the cavity's parameters on the observables show particularities as a function of these components, such as a higher rate of the amplitude on the horizontal component as well as a perturbation of the direct seismic surface wave amplitude above the cavity, also higher on the horizontal component. This latter feature is particularly visible on the variation of the elliptical particle motion recorded at the surface. It can be linked to the mode conversions that occur in the vicinity of the cavity and which predominate on the horizontal component when the signal is normalized.

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Section: Introductionmentioning

confidence: 99%

New robust observables on Rayleigh waves affected by an underground cavity: from numerical to experimental modelling

Filippi

Leparoux²,

Grandjean

et al. 2019

Geophysical Journal International

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“…Seismic methods are the most suitable to delineate geological boundaries and the external geometry of the aquifer. Gravity can be used to identify large voids, such as potential sinkholes, as well as caves and major karst conduits [9][10][11][12][13][14][15]. Moreover, geoelectrical and electromagnetic methods, by determining lateral and vertical variations in subsurface electrical resistivity, are useful to identify geological and hydrogeological features, such as caves, fractures, and sinkholes, and are particularly sensitive to the presence of subsurface water [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Deep Electrical Resistivity Tomography for the Hydrogeological Setting of Muro Lucano Mounts Aquifer (Basilicata, Southern Italy)

Rizzo¹,

Giampaolo²,

Capozzoli³

et al. 2019

Geofluids

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The proposed work concerns the application of a deep geoelectrical survey to a carbonate aquifer in order to define the best location for exploitation well drilling for increasing water supply. However, an optimal characterization of a groundwater resource is the necessary condition to reach the indicated aim. Therefore, the geoelectrical investigation was guided from the previous geological and hydrogeological characterization. Moreover, geophysical methods are good tools to improve the groundwater model when detailed information is necessary, such as the localization of a pumping well. The work summarizes the hydrogeological knowledge at the West of the Basilicata Region (Muro Lucano, Italy). The investigated area is characterized by the presence of a karst aquifer which is made up of a carbonate ridge (Castelgrande, Muro Lucano) that tectonically dips southward and is widely covered by Pliocene deposits (sands and conglomerates), by the Irpinian unit and Sicilide unit formations, and by debris slope and landslide deposits. The assessment of the complex hydrogeological framework of the area was detailed by the use of a new multichannel deep geoelectrical technique (DERT). In details, the proposed technique was able to successfully locate a less resistive zone connected to a more fractured limestone and then it was suitable for the localization of a groundwater exploitation well.

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“…Different types of waves can be used in such studies, such as reflected (Cook ; Branham and Steeples ; Miller and Steeples ; Kourkafas and Goulty ; Piwakowski, Waletet and Moreaux ; Di Fiore et al . ), refracted (Engelsfeld, Šumanovac and Pavin ), surface (Leparoux, Bitri and Grandjean ; Xu and Butt ; Kaslilar et al . ), channel (Yancey et al .…”

Section: Introductionmentioning

confidence: 99%

Detecting underground cavities using microtremor data: physical modelling and field experiment

Kolesnikov

Fedin

2017

Geophysical Prospecting

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In this paper, we study the possibilities of the use of microtremor records in the detection and delineation of near‐surface underground cavities. Three‐dimensional physical modelling data showed that the averaging amplitude spectra of a large number of microtremor records makes it possible to evaluate the frequencies and amplitudes of compressional standing waves generated by microtremor in the space between the ground surface and underground cavities. We illustrate how these parameters can be used to estimate the shape of the underground cavity horizontal projection. If the compressional wave velocity in the enclosing rock is known, it is possible to evaluate the depth to the cavity top using the frequencies of the standing waves. The results of the field experiment confirmed the possibility of underground cavities detection using microtremor data.

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High Resolution Seismic Reflection Methods to Detect Near Surface Tuff-Cavities: A Case Study in the Neapolitan Area, Italy

Cited by 10 publications

References 15 publications

New robust observables on Rayleigh waves affected by an underground cavity: from numerical to experimental modelling

New robust observables on Rayleigh waves affected by an underground cavity: from numerical to experimental modelling

Deep Electrical Resistivity Tomography for the Hydrogeological Setting of Muro Lucano Mounts Aquifer (Basilicata, Southern Italy)

Detecting underground cavities using microtremor data: physical modelling and field experiment

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