Geophysical surveys are carried out in the coastal area of Petrosino (southwestern Sicily) to stu... more Geophysical surveys are carried out in the coastal area of Petrosino (southwestern Sicily) to study the time evolution of seawater contamination of the coastal aquifer, probably increased due to human impact. The overexploitation of the aquifer, due to an intensive agricultural use has affected significantly the natural hydro-geochemical state of the basin. The study is based on a processing and integrated analysis of hydrogeological, geochemical and geophysical data. In particular in the last two years seasonal time-lapse electrical resistivity tomographies (ERT), new TDEM soundings and Multi-Analysis Surface Wave soundings (MASW) have been carried out. The interpretation of the total set of previously existing and new geophysical data made it possible to reconstruct a three-dimensional model of the electrical resistivity of the aquifer, aimed at defining the extent and geometry of the seawater intrusion. Furthermore, the execution of a series of high-resolution time-lapse electrical tomographies and a correlation analysis between geophysical measures and geo-chemical, geological and hydrogeological data allowed to discriminate the effects of the salt concentration in the groundwater and the porosity and saturation degree of the rock on the time variations of the measured electrical resistivity. Finally, the average porosity of the rocks forming the reservoir was determined.
... AGNESI Valerio ; PINGUE Folco ; ROTIGLIANO Edoardo ; OBRIZZO Francesco ; DI MAGGIOCipriano ; ... more ... AGNESI Valerio ; PINGUE Folco ; ROTIGLIANO Edoardo ; OBRIZZO Francesco ; DI MAGGIOCipriano ; LUZIO Dario ; TAMMARO Umberto ; ... phenomena are responsible for the existence of double crests, depression alignments and river valleys truncated at their head, due to ...
This paper introduces a new technique for clustering seismic events based on processing, in time-... more This paper introduces a new technique for clustering seismic events based on processing, in time-frequency domain, the waveforms recorded by seismographs. The detection of clusters of waveforms is performed by a k-means like algorithm which analyzes, at each iteration, the time-frequency content of the signals in order to optimally remove the non discriminant components which should compromise the grouping of waveforms. This step is followed by the allocation and by the computation of the cluster centroids on the basis of the filtered signals. The effectiveness of the method is shown on a real dataset of seismic waveforms.
... AGNESI Valerio ; PINGUE Folco ; ROTIGLIANO Edoardo ; OBRIZZO Francesco ; DI MAGGIOCipriano ; ... more ... AGNESI Valerio ; PINGUE Folco ; ROTIGLIANO Edoardo ; OBRIZZO Francesco ; DI MAGGIOCipriano ; LUZIO Dario ; TAMMARO Umberto ; ... phenomena are responsible for the existence of double crests, depression alignments and river valleys truncated at their head, due to ...
A report is given of the activity of the Sea Land Group(a) concerning the CROP MARE II seismic pr... more A report is given of the activity of the Sea Land Group(a) concerning the CROP MARE II seismic project. In this experiment, jointly with near-vertical seismic data acquisition (NVR), the Sea Land Group acquired high-density wide-angle reflection/refraction data (WARR) in some offshore/on-shore configurations along the Italian coast. A concise and complete overview is given of the acquisition scheme, the processing techniques used and the problems connected with the acquisition and management of this kind of data. Our experience led us to get over the standard processing techniques commonly adopted in WARR and NVR seismics, setting up innovative Matlab procedures for data processing. Such a development was directed at an integrated use of smalland great-offset seismic signals for the optimisation of imaging and modelling of lithospheric structures.
The Calabrian Arc, Southern Italy, is characterised by the subduction of the Ionian lithosphere -... more The Calabrian Arc, Southern Italy, is characterised by the subduction of the Ionian lithosphere -since Middle Miocene- beneath the Tyrrhenian basin. The related Benioff zone is seismically active to a depth > 500 km. The tomoDD code [Zhang and Thurber, 2003] was adopted to perform the tomography, using a set of 2463 earthquakes located in the window 14°30' E - 17°E and 37°N - 41°N, and recorded by seismic networks of the INGV in the period 1981-2005. Several inversions were performed using different selections of absolute and differential data obtained varying the maximum RMS and the threshold of the inter-event distance. Various synthetic and experimental tests were executed to evaluate the resolution and stability of the tomographic inversion. The inversions carried out for the synthetic and the restoration-resolution test [Zhao et al., 1992] were repeated several times with the same procedure used in the inversion of experimental data. The lack of bias in the models, relat...
Geophysical surveys are carried out in the coastal area of Petrosino (southwestern Sicily) to stu... more Geophysical surveys are carried out in the coastal area of Petrosino (southwestern Sicily) to study the time evolution of seawater contamination of the coastal aquifer, probably increased due to human impact. The overexploitation of the aquifer, due to an intensive agricultural use has affected significantly the natural hydro-geochemical state of the basin. The study is based on a processing and integrated analysis of hydrogeological, geochemical and geophysical data. In particular in the last two years seasonal time-lapse electrical resistivity tomographies (ERT), new TDEM soundings and Multi-Analysis Surface Wave soundings (MASW) have been carried out. The interpretation of the total set of previously existing and new geophysical data made it possible to reconstruct a three-dimensional model of the electrical resistivity of the aquifer, aimed at defining the extent and geometry of the seawater intrusion. Furthermore, the execution of a series of high-resolution time-lapse electrical tomographies and a correlation analysis between geophysical measures and geo-chemical, geological and hydrogeological data allowed to discriminate the effects of the salt concentration in the groundwater and the porosity and saturation degree of the rock on the time variations of the measured electrical resistivity. Finally, the average porosity of the rocks forming the reservoir was determined.
... AGNESI Valerio ; PINGUE Folco ; ROTIGLIANO Edoardo ; OBRIZZO Francesco ; DI MAGGIOCipriano ; ... more ... AGNESI Valerio ; PINGUE Folco ; ROTIGLIANO Edoardo ; OBRIZZO Francesco ; DI MAGGIOCipriano ; LUZIO Dario ; TAMMARO Umberto ; ... phenomena are responsible for the existence of double crests, depression alignments and river valleys truncated at their head, due to ...
This paper introduces a new technique for clustering seismic events based on processing, in time-... more This paper introduces a new technique for clustering seismic events based on processing, in time-frequency domain, the waveforms recorded by seismographs. The detection of clusters of waveforms is performed by a k-means like algorithm which analyzes, at each iteration, the time-frequency content of the signals in order to optimally remove the non discriminant components which should compromise the grouping of waveforms. This step is followed by the allocation and by the computation of the cluster centroids on the basis of the filtered signals. The effectiveness of the method is shown on a real dataset of seismic waveforms.
... AGNESI Valerio ; PINGUE Folco ; ROTIGLIANO Edoardo ; OBRIZZO Francesco ; DI MAGGIOCipriano ; ... more ... AGNESI Valerio ; PINGUE Folco ; ROTIGLIANO Edoardo ; OBRIZZO Francesco ; DI MAGGIOCipriano ; LUZIO Dario ; TAMMARO Umberto ; ... phenomena are responsible for the existence of double crests, depression alignments and river valleys truncated at their head, due to ...
A report is given of the activity of the Sea Land Group(a) concerning the CROP MARE II seismic pr... more A report is given of the activity of the Sea Land Group(a) concerning the CROP MARE II seismic project. In this experiment, jointly with near-vertical seismic data acquisition (NVR), the Sea Land Group acquired high-density wide-angle reflection/refraction data (WARR) in some offshore/on-shore configurations along the Italian coast. A concise and complete overview is given of the acquisition scheme, the processing techniques used and the problems connected with the acquisition and management of this kind of data. Our experience led us to get over the standard processing techniques commonly adopted in WARR and NVR seismics, setting up innovative Matlab procedures for data processing. Such a development was directed at an integrated use of smalland great-offset seismic signals for the optimisation of imaging and modelling of lithospheric structures.
The Calabrian Arc, Southern Italy, is characterised by the subduction of the Ionian lithosphere -... more The Calabrian Arc, Southern Italy, is characterised by the subduction of the Ionian lithosphere -since Middle Miocene- beneath the Tyrrhenian basin. The related Benioff zone is seismically active to a depth > 500 km. The tomoDD code [Zhang and Thurber, 2003] was adopted to perform the tomography, using a set of 2463 earthquakes located in the window 14°30' E - 17°E and 37°N - 41°N, and recorded by seismic networks of the INGV in the period 1981-2005. Several inversions were performed using different selections of absolute and differential data obtained varying the maximum RMS and the threshold of the inter-event distance. Various synthetic and experimental tests were executed to evaluate the resolution and stability of the tomographic inversion. The inversions carried out for the synthetic and the restoration-resolution test [Zhao et al., 1992] were repeated several times with the same procedure used in the inversion of experimental data. The lack of bias in the models, relat...
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