Search results for "LCA"
showing 10 items of 1995 documents
Validation of a novel Multi-Gas sensor for volcanic HCl alongside H
2016
Volcanic gas emission measurements inform predictions of hazard and atmospheric impacts. For these measurements, Multi-Gas sensors provide low-cost in situ monitoring of gas composition but to date have lacked the ability to detect halogens. Here, two Multi-Gas instruments characterized passive outgassing emissions from Mt. Etna’s (Italy) three summit craters, Voragine (VOR), North-east Crater (NEC) and Bocca Nuova (BN) on 2 October 2013. Signal processing (Sensor Response Model, SRM) approaches are used to analyse H2S/SO2 and HCl/SO2 ratios. A new ability to monitor volcanic HCl using miniature electrochemical sensors is here demonstrated. A “direct-exposure” Multi-Gas instrument contained…
Volcano seismicity and ground deformation unveil the gravity-driven magma discharge dynamics of a volcanic eruption.
2015
Effusive eruptions are explained as the mechanism by which volcanoes restore the equilibrium perturbed by magma rising in a chamber deep in the crust. Seismic, ground deformation and topographic measurements are compared with effusion rate during the 2007 Stromboli eruption, drawing an eruptive scenario that shifts our attention from the interior of the crust to the surface. The eruption is modelled as a gravity-driven drainage of magma stored in the volcanic edifice with a minor contribution of magma supplied at a steady rate from a deep reservoir. Here we show that the discharge rate can be predicted by the contraction of the volcano edifice and that the very-long-period seismicity migrat…
Rapid migration of CO2-rich micro-fluids in calcite matrices
2018
International audience; The transport of supercritical fluids is a determining factor for several geological processes and fundamental in predicting natural resource accumulation and distribution. Calcite, ubiquitous in most geological environments, may contain supercritical CO2 trapped under the form of fluid inclusions that may move through grain boundaries affecting the rock physical properties. However, despite macroscopic evidence for this process, until recent it was not possible to characterize this process at the nano-scale due to the difficulty of such observations. In this study, we report nanometer-scale observations on calcite crystal surfaces and demonstrate that stress with ab…
Mapping Susceptibility to Debris Flows Triggered by Tropical Storms: A Case Study of the San Vicente Volcano Area (El Salvador, CA)
2021
In this study, an inventory of storm-triggered debris flows performed in the area of the San Vicente volcano (El Salvador, CA) was used to calibrate predictive models and prepare a landslide susceptibility map. The storm event struck the area in November 2009 as the result of the simultaneous action of low-pressure system 96E and Hurricane Ida. Multivariate Adaptive Regression Splines (MARS) was employed to model the relationships between a set of environmental variables and the locations of the debris flows. Validation of the models was performed by splitting 100 random samples of event and non-event 10 m pixels into training and test subsets. The validation results revealed an excellent (…
Ottantuno anelli
2011
Le opere appartengono a tipologie diffuse non solo nell'oreficeria siciliana bensì in tutta l'area centro-meridionale italiana.
Due anelli da fidanzamento o nuziali
2011
Si tratta di monili in oro e corallo riferibili a maestranze trapanesi della prima metà del XIX secolo
Anello
2011
Il pregevole anello, in oro e conchiglia, è una tipica realizzazione delle maestranze trapanesi d'inizio XIX secolo
Due anelli
2011
Si tratta di due anelli in oro e corallo, opere di maestranze trapanesi della prima metà del XIX secolo, che presentano un piccolo cammeo raffigurante il volto di Cristo
Anello
2011
Il prezioso anello, realizzato in oro e granati cabochon, è riconducibile a orafo siciliano della prima metà del XIX secolo
Anello
2011
L'opera, ascrivibile alla tipologia cosiddetta "a pigna", è da riferire a orafo siciliano della fine del XVIII secolo