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Grillo, Barbara
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Grillo, Barbara
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- PublicationOpen AccessLA STAZIONE GEOFISICA IPOGEA DELLA GROTTA GIGANTE (CARSO TRIESTINO)(2012-10-26)
; ; ; ; ; ; ; ; ; ; ; ;Braitenberg, Carla; Dipartimento di Geoscienze, Università di Trieste (DIGeo, ex DST) ;Zadro, Maria; Dipartimento di Geoscienze, Università di Trieste (DIGeo, ex DST) ;Nagy, Ildikò; Dipartimento di Geoscienze, Università di Trieste (DIGeo, ex DST) ;Grillo, Barbara; Dipartimento di Geoscienze, Università di Trieste (DIGeo, ex DST) ;Tenze, Daniele; Dipartimento di Geoscienze, Università di Trieste (DIGeo, ex DST) ;Mariani, Patrizia; Dipartimento di Geoscienze, Università di Trieste (DIGeo, ex DST) ;Zidarich, Sergio Zidarich; Dipartimento di Geoscienze, Università di Trieste (DIGeo, ex DST) ;Romeo, Giovanni; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Taccetti, Quintilio; Istituto Nazionale di Geofisica e Vulcanologia, Sezione AC, Roma, Italia ;Spinelli, Giuseppe; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Benedetti, Paolo; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; ; ; ; ; ; ; ; ; ; aggiornamento sul dispositivo di calibrazione dell’acquisizione digitale dati dei pendoli della Grotta Gigante.308 331 - PublicationRestrictedCansiglio Karst Plateau: 10 Years of Geodetic–Hydrological Observations in Seismically Active Northeast ItalyTen years’ geodetic observations (2006–2016) in a natural cave of the Cansiglio Plateau (Bus de la Genziana), a limestone karstic area in northeastern Italy, are discussed. The area is of medium–high seismic risk: a strong earthquake in 1936 below the plateau (Mm = 6.2) and the 1976 disastrous Friuli earthquake (Mm = 6.5) are recent events. At the foothills of the karstic massif, three springs emerge, with average flow from 5 to 10 m3/s, and which are the sources of a river. The tiltmeter station is set in a natural cavity that is part of a karstic system. From March 2013, a multiparametric logger (temperature, stage, electrical conductivity) was installed in the siphon at the bottom of the cave to discover the underground hydrodynamics. The tilt records include signals induced by hydrologic and tectonic effects. The tiltmeter signals have a clear correlation to the rainfall, the discharge series of the river and the data recorded by multiparametric loggers. Addition- ally, the data of a permanent GPS station located on the southern slopes of the Cansiglio Massif (CANV) show also a clear corre- spondence with the river level. The fast water infiltration into the epikarst, closely related to daily rainfall, is distinguished in the tilt records from the characteristic time evolution of the karstic springs, which have an impulsive level increase with successive exponential decay. It demonstrates the usefulness of geodetic measurements to reveal the hydrological response of the karst. One outcome of the work is that the tiltmeters can be used as proxies for the presence of flow channels and the pressure that builds up due to the water flow. With 10 years of data, a new multidisciplinary frontier was opened between the geodetic studies and the karstic hydrogeology to obtain a more complete geologic description of the karst plateau.
138 1 - PublicationRestrictedThe study of karstic aquifers by geodetic measurements in bus de la genziana station – cansiglio plateau (northeastern Italy)(2011)
; ; ; ; ;Grillo, B.; Dept. Geosciences, University of Trieste ;Braitenberg, C.; Dept. Geosciences, University of Trieste ;Devoti, R.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Nagy, I.; Dept. Geosciences, University of Trieste; ; ; using tiltmeters and GPS observations. The study region is located in northeastern Italy, in the seismic area of the Cansiglio Plateau. The Zöllner type Marussi tiltmeters are installed in a natural cavity (Bus de la Genziana) that is part of an interesting karstic area of particular hydrogeologic importance. The Livenza river forms from a number of springs at the foothills of the karstic massif and flows through the Friuli-Veneto plain into the Adriatic Sea. Comparing the tiltmeter signal recorded at the Genziana station with the local pluviometrical series and the hydrometric series of the Livenza river, a clear correlation is recognized. Moreover, the data of a permanent GPS station located on the southern slopes of the Cansiglio Massif (CANV) show also a clear correspondence with the water runoff. Here we present the hydrologic induced deformations as observed by tiltmeter and GPS. After heavy rain events we record rapid deformations both by tiltmeters and GPS corresponding to the rainfall duration. In the following days a slow geodetic motion recovers the accumulated deformation with a distinctive pattern both in tilt and GPS data, which correlates with the runoff of the karstic aquifer. The purpose of this research is to open a new multidisciplinary frontier between geodetic and karstic systems studies to improve the knowledge of the underground fluid flow circulation in karstic areas. Furthermore a better characterization of the hydrologic effects on GPS and tilt observations will have the benefit that these signals can be corrected when the focus of the study is to recover the tectonic deformation.172 22 - PublicationRestrictedHydrologically induced slope deformations detected by GPS and clinometric surveys in the Cansiglio Plateau, southern Alps(2015-03-31)
; ; ; ; ; ;Devoti, R.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Zuliani, D.; Centro Ricerche Sismologiche, OGS, Udine ;Braitenberg, C.; Dip. di Matematica e Geoscienze, Università di Trieste ;Fabris, P.; Centro Ricerche Sismologiche, OGS, Udine ;Grillo, B.; Dip. di Matematica e Geoscienze, Università di Trieste; ; ; ; Changes in groundwater or surface water level may cause observable deformation of the drainage basins in different ways. We describe an active slope deformation monitored with GPS and tiltmeter stations in a karstic limestone plateau in southeastern Alps (Cansiglio Plateau). The observed transient GPS deformation clearly correlates with the rainfall. Both GPS and tiltmeter equipments react instantly to heavy rains displaying abrupt offsets, but with different time constants, demonstrating the response to different catchment volumes. The GPS movement is mostly confined in the horizontal plane (SSW direction) showing a systematic tendency to rebound in the weeks following the rain. Four GPS stations concur to define a coherent deformation pattern of a wide area (12 × 5 km2), concerning the whole southeastern slope of the plateau. The plateau expands and rebounds radially after rain by an amount up to a few centimeters and causing only small vertical deformation. The effect is largest where karstic features are mostly developed, at the margin of the plateau where a thick succession of Cretaceous peritidal carbonates faces the Venetian lowland. Acouple of tiltmeters installed in a cave at the top of the plateau, detect a much faster deformation, that has the tendency to rebound in less than 6h. The correlation to rainfall is less straightforward, and shows a more complex behavior during rainy weather. The different responses demonstrate a fast hydrologic flow in the more permeable epikarst for the tiltmeters, drained by open fractures and fissures in the neighborhood of the cave, and a rapid tensile dislocation of the bedrock measured at the GPS stations that affect the whole slope of the mountain. In the days following the rain, both tiltmeter and GPS data show a tendency to retrieve the displacement which is consistent with the phreatic discharge curve. We propose that hydrologically active fractures recharged by rainfall are the most likely features capable to induce the observed strain variations.509 86