Three‐dimensional resistivity probability tomography at the prehistoric site of grotta reali (Molise, Italy)

Compare, Vincenzo; Cozzolino, Marilena; Mauriello, Paolo; Patella, D.

doi:10.1002/arp.347

Cited by 18 publications

(14 citation statements)

References 14 publications

(13 reference statements)

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“…Many datasets have been successfully interpreted on this semi-quantitative basis, e.g. in archaeological prospection [19,20]. In all of the cases in which the correct estimate of the true physical parameter is considered essential for assessing the inner properties of the target, the PT results can be used as robust and confident geometric constraints in any of the standard inversion routines.…”

Section: Discussionmentioning

confidence: 99%

Geophysical Tomography in Engineering Geological Applications: A Mini-Review with Examples

Patella

Patella²

2009

TOGEOJ

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An overview of the geophysical tomography interpretation method is presented. Two approaches are reviewed, (1) deterministic tomography inversion, developed for rock elasticity investigations, and (2) probability tomography imaging, developed in the domain of potential field methods. The theoretical basis of both approaches is initially outlined, then selected laboratory and field applications in different areas of engineering geology are presented and discussed. In particular, an ultrasonic laboratory experiment for the determination of the mechanical features of a block of marble and a crosshole seismic field experiment for quality assurance of a concrete placement are shown at first as examples of deterministic tomography inversion. Then, a geoelectrical field experiment aimed at detecting pollution leaks from a waste disposal and a self-potential field experiment for water flow modeling in a landslide are presented as examples of probability tomography imaging.

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Section: Discussionmentioning

confidence: 99%

Geophysical Tomography in Engineering Geological Applications: A Mini-Review with Examples

Patella

Patella²

2009

TOGEOJ

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“…; Compare et al . ,b). In all cases, the 2D or 3D probability tomography mapping of the η (P q ) function given by equation proved to be a reliable tool for recognizing the most probable location of the buried anomaly source centres, compatible with the available data set.…”

Section: Outline Of the Perti Methodsmentioning

confidence: 99%

Resistivity Tomography Imaging of the Substratum of the Bedestan Monumental Complex at Nicosia, Cyprus

2013

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In the framework of the EU-UNDP project 'Rehabilitation of Old Nicosia' (Cyprus, 2004-9), a high-resolution geoelectrical survey has been performed inside the partially ruined monumental complex of St Nicholas of the English, now called the Bedestan, which was designed to become a venue space for cultural activities. The aim was to detect buried traces of a Byzantine basilica of the sixth century, on the ruins of which, according to tradition, the construction of St Nicholas was begun in the 12th century. The survey has been conducted on the floor of the monument, using a dipole-dipole electrode array along two perpendicular sets of profiles. In order to model the resistivity distribution, the probability-based electrical resistivity tomography inversion (PERTI) method has been applied. Sets of aligned blocks with resistivity in the range 100-400 ohm·m, bounding a three-room rectangular space, and traces of a rounded structure with mean resistivity about 150 ohm·m, appearing at one extremity of the central room, are the main resistive features recognized down to 4 m depth, within a conductive background with resistivity in the range 20-40 ohm·m. Altogether, these resistive features, showing in plan the shape of a church characterized by a central nave with an apse and two side aisles, have been interpreted as an evidence of the existence of remains of the earlier Byzantine basilica. Moreover, small volumes with resistivity in the range 10-12.6 ohm·m have been found, scattered underneath the whole surveyed area. Taking into account the PERTI results, ground-truth has been performed in two sites, designed to become two permanent protected exposures of the archaeological findings beneath the floor of the newly restored Bedestan. At one site, excavations detected remains of masonry in correspondence of the alignment of resistive blocks at the left margin of the left side aisle of the churchlike structure. At the other site, graves, entirely filled with wet debris in an alluvial soil matrix, have, instead, been found in correspondence with the greatest conductive volume, detected outside the perimeter of the churchlike structure. Both findings have been dated back to the sixth century. Since the Bedestan case-history is one of the first applications of the PERTI algorithm to real field data sets, its performance has been tested using the well-known ERTLab TM commercial software as benchmark. The comparison has shown a general consistency between the two inversions, and also confirmed the much higher computing speed, better filtering capacity and greater versatility of the PERTI algorithm, already outlined in a previous paper where only synthetic models were tested.

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“…Recently, the application of electrical resistivity studies in periglacial research has been further developed. Inspired by field examples in neighbouring disciplines such as environmental (Loke and Barker 1996; Yi et al 2001; Chambers et al 2002; Bentley and Gharibi 2004; Bichler et al 2004), hydrological (Park 1998) and archaeological sciences (Papadopoulos et al 2007; Compare et al 2009), series of parallel and orthogonal 2D ERT profiles are merged and inverted subsequently with a 3D inversion algorithm.…”

Section: Introductionmentioning

confidence: 99%

“…The analysis aims at the 3D mapping and characterization of permafrost occurrence by means of ERT. As two different electrode arrays (Wenner and Wenner-Schlumberger) are measured during data acquisition and a modified combination of survey lines is (Park 1998) and archaeological sciences (Papadopoulos et al 2007;Compare et al 2009), series of parallel and orthogonal 2D ERT profiles are merged and inverted subsequently with a 3D inversion algorithm.…”

Section: Introductionmentioning

confidence: 99%

Permafrost mapping using quasi‐3D resistivity imaging, Murtèl, Swiss Alps

Rödder

Kneisel

2011

Near Surface Geophysics

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To investigate recent permafrost characteristics in detail, quasi‐3D resistivity imaging was applied to map the extent of frozen ground in an area of a glacier forefield in the Engadin/Eastern Swiss Alps. This approach combines a number of parallel and perpendicular electrical resistivity tomography (ERT) profiles into one data set and enables a subsequent 3D inversion and interpretation of geoelectric resistivity results. Spatial information about resistivity distribution within the heterogeneous subsurface of the investigated area is gained and allows a detailed analysis of permafrost occurrence, which is superior to two‐dimensional resistivity surveying. Information about the consistency of the model results is obtained from the modification of the damping parameters during the inversion process. Data sets based on different combinations of ERT profiles and array types were compared to optimize the adequate number and orientation of profiles required for 3D inversion. Our findings show the importance of perpendicular tie lines in improving the image of the subsurface resistivity distribution. Inversion results from a Wenner‐Schlumberger array are regarded as the best trade‐off between accuracy and acquisition time in this periglacial environment. Spatial resistivity data facilitate a good delineation of a distinct permafrost body within the measurement grid. In addition, borehole temperatures are used as ground truth data. Our results show that quasi‐3D resistivity imaging allows a spatial interpretation of ground conditions and thus constitutes an improvement compared to scattered 2D ERT profiles. In particular, single landforms of small‐ to medium‐scale can be regarded as objectives and favour the application of detailed quasi‐3D surveys.

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Three‐dimensional resistivity probability tomography at the prehistoric site of grotta reali (Molise, Italy)

Cited by 18 publications

References 14 publications

Geophysical Tomography in Engineering Geological Applications: A Mini-Review with Examples

Geophysical Tomography in Engineering Geological Applications: A Mini-Review with Examples

Resistivity Tomography Imaging of the Substratum of the Bedestan Monumental Complex at Nicosia, Cyprus

Permafrost mapping using quasi‐3D resistivity imaging, Murtèl, Swiss Alps

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