Conference Presentations by Nicola Cenni
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Papers by Nicola Cenni
Remote Sensing, 2021
The Po River Delta (PRD, Northern Italy) has been historically affected by land subsidence due to... more The Po River Delta (PRD, Northern Italy) has been historically affected by land subsidence due to natural processes and human activities, with strong impacts on the stability of the natural ecosystems and significant socio-economic consequences. This paper is aimed to highlight the spatial and temporal evolution of the land subsidence in the PRD area analyzing the geodetic observations acquired in the last decade. The analysis performed using a moving window approach on Continuous Global Navigation Satellite System (CGNSS) time-series indicates that the velocities, in the order of 6 mm/year, are not affected by significant changes in the analyzed period. Furthermore, the use of non-permanent sites belonging to a new GNSS network (measured in 2016 and 2018) integrated with InSAR data (from 2014 to 2017) allowed us to improve the spatial coverage of data points in the PRD area. The results suggest that the land subsidence velocities in the easternmost part of the area of interest are ...
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<p><span>The Po Plain (Northern Italy) has largely su... more <p><span>The Po Plain (Northern Italy) has largely subsided due to natural processes and human activities. In particular, in order to reduce subsidence, in the Bologna metropolitan area a politic decision in 2010, imposed a significant reduction of civil water supply from groundwater withdrawal wells. The study area is characterized by an excellent monitoring activity which provides a good spatial and temporal distribution of data coming from continuous GNSS sites, piezometers and rain gauges. </span></p><p><span>In the present work we analyze both GNSS and piezometric data by means of the Principal Component Analysis (PCA). The results of the analysis are then compared with the rainfall time series measured by rain gauges. Thanks to the PCA analysis we can identify: i) a clear increase in the water level following the withdrawal decrease started in 2010 and ii) an anthropic induced surface displacement, which is smaller in magnitude than that induced by rainfall variations. Without the PCA analysis, such a small, but still significant, anthropic effect on vertical displacements would have remained hidden in the raw time series. </span></p><p><span>Our analysis reveals a decrease of about 4 mm/y of vertical velocity in some GNSS sites closest the withdrawal wells. We also found that on large time scales (> 1 month), the vertical displacement induced by rainfall strongly depends on the geological setting: in the mountains a water level increase causes subsidence (elastic response), whereas in the Po Plain it causes uplift (poro-elastic response). Thanks to the PCA analyses, the combined observations of different kind of instruments (GNSS, piezometers and rain gauges) and a basic knowledge of the geological context, we can correctly identify both the anthropic and natural signals on the data.</span></p>
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Some considerations are given about attempts at predicting impending earthquakes by the use of sp... more Some considerations are given about attempts at predicting impending earthquakes by the use of space geodetic (GPS) observations in the Italian peninsula. Both short (weeks to days) and middle/long-term (months to years) presumed precursors are considered. At present, none of the numerous published studies seems to identify significant and systematic earthquake precursors. At most, geodetic data may be used to quantify the rate of tectonic deformation and its lateral variations, in order to identify the zones where strain accumulation is fastest. However, the connection between the level of strain and the probability of earthquakes is not clear yet. We argue that the most promising way to use geodetic data is monitoring post-seismic relaxation, that is the perturbation of the strain field triggered by a major shock. The examples recognized so far of interaction between seismic sources suggest that the highest probability of induced earthquakes at a mature fault corresponds to the ar...
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International Journal of Geosciences, 2017
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During the time span 1999-2002 we set up and surveyed the CA-GeoNet (Central Apennine Geodetic Ne... more During the time span 1999-2002 we set up and surveyed the CA-GeoNet (Central Apennine Geodetic Network), a dense sub-regional GPS network located in one of the highest seismic areas of the Apennines (Italy), with the aim to detect the active strain rate of this sector of the chain, during inter-seismic and co-seismic epochs. The network extends across southern Umbria (Norcia
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34° Convegno Nazionale del Gruppo Nazionale di Geofisica della Terra Solida (GNSTS), 2015
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Conferenza Nazionale ASITA 2017, 2017
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Remote. Sens., 2021
Land subsidence is a geological hazard that affects several different communities around the worl... more Land subsidence is a geological hazard that affects several different communities around the world [...]
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Journal of the Geological Society, 2019
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The Po basin has been affected in the last sixty years by a strong subsidence due to groundwater ... more The Po basin has been affected in the last sixty years by a strong subsidence due to groundwater pumping from a shallow well-developed multi-aquifer system and oil & gas production from a number of onshore and offshore reservoirs. Once this phenomenon was identified, several monitoring campaigns were carried out by different techniques since the 1897 (Arca and Beretta 1985): precise topographic levelling, GPS, SAR and vertical extensometers. The relatively large amount of observations so far acquired offers the opportunity of monitoring the spatial pattern of land subsidence in the Po Plain, especially for the second half of the 20 th century, when the subsidence dramatically increased. The large diffusion of the space geodetic techniques, as GPS and SAR, in the last twenty years has provided two new tools which have a relatively low cost, and can improve significantly the spatial and temporal monitoring of the subsidence phenomena. So currently, the monitoring 134 GNGTS 2014 sessio...
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Nato Science Series: IV: Earth and Environmental Sciences
... Enzo Mantovani 1, Daniele Babbucci 1, Marcello Viti 1, Dario Albarello 1, Enrico Mugnaioli 1,... more ... Enzo Mantovani 1, Daniele Babbucci 1, Marcello Viti 1, Dario Albarello 1, Enrico Mugnaioli 1, Nicola Cenni 2, Giuseppe Casula 3 1 ... activity occurred in the Apenninic belt, particularly in the Southern Apennines and the Calabrian Arc (Castellarin and Vai, 1986; Ortolani and ...
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Geophysical Research Letters, 2001
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Geophysical Journal International, 2004
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Geophysical Journal International, 2003
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Remote Sensing, 2022
Newly collected morphobathymetric and seismic reflection data from the Valli di Comacchio coastal... more Newly collected morphobathymetric and seismic reflection data from the Valli di Comacchio coastal lagoons, south of the Po River delta (Northeast Italy), combined with historical, remote sensing, and geodetic data highlight a complex geological evolution during the Holocene, strongly affected by anthropic control. All data allowed us to define the present-day depositional environment of the lagoons and reconstruct their recent (late Pleistocene/Holocene) geo-history. We focused on the effects of the anthropic impacts in modifying the pristine environments created by the Holocene transgression along the Adriatic Sea coast, at the mouth of a major river. They include land reclamation works, artificial damming, channel excavations, fluvial diversions, and a recent (last decades) increase in subsidence rate due to gas and water withdrawals. Despite the development of economic activities, which promoted occupation and exploitation of this area in the last millennia, the post-Glacial evol...
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Major seismic activity in the Northern Apennines concentrates in few zones, distributed in a pecu... more Major seismic activity in the Northern Apennines concentrates in few zones, distributed in a pecu-liar way. It is argued that such context may be plausibly explained as an effect of belt-parallel shortening, which has caused oroclinal bending of the longitudinal ridges formed during the Late Miocene to Lower Pliocene evolutionary phase. The main effects of this process, developed since the upper Pliocene, have mainly affected the outer sectors of the belt. The major seismic sources have generated in the zones where different oroclinal bendings of adjacent ridges have produced extensional/transtensional deformation. In the inner side of the Northern Apennines, belt parallel shortening has occurred at a lower rate. The main effects have resulted from the shortening of the Albano-Chianti-Rapolano-Cetona ridge. In particular, the proposed tectonic setting may account for the moderate seismic activity that occurs in the Firenze, Elsa, Pesa, Siena and Radicofani ba-sins.
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Remote. Sens., 2021
The Po River Delta (PRD, Northern Italy) has been historically affected by land subsidence due to... more The Po River Delta (PRD, Northern Italy) has been historically affected by land subsidence due to natural processes and human activities, with strong impacts on the stability of the natural ecosystems and significant socio-economic consequences. This paper is aimed to highlight the spatial and temporal evolution of the land subsidence in the PRD area analyzing the geodetic observations acquired in the last decade. The analysis performed using a moving window approach on Continuous Global Navigation Satellite System (CGNSS) time-series indicates that the velocities, in the order of 6 mm/year, are not affected by significant changes in the analyzed period. Furthermore, the use of non-permanent sites belonging to a new GNSS network (measured in 2016 and 2018) integrated with InSAR data (from 2014 to 2017) allowed us to improve the spatial coverage of data points in the PRD area. The results suggest that the land subsidence velocities in the easternmost part of the area of interest are ...
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Conference Presentations by Nicola Cenni
Papers by Nicola Cenni