Early signals of new volcanic unrest at Campi Flegrei caldera? Insights from geochemical data and physical simulations

Geology ◽  
2012 ◽  
Vol 40 (10) ◽  
pp. 943-946 ◽  
Author(s):  
Giovanni Chiodini ◽  
S. Caliro ◽  
P. De Martino ◽  
R. Avino ◽  
F. Gherardi
Keyword(s):  
Campi Flegrei ◽  
Geochemical Data ◽  
Volcanic Unrest ◽  
Campi Flegrei Caldera ◽  
Physical Simulations

scholarly journals Study of Surface Emissions of 220Rn (Thoron) at Two Sites in the Campi Flegrei Caldera (Italy) during Volcanic Unrest in the Period 2011–2017

2021 ◽  
Vol 11 (13) ◽  
pp. 5809
Author(s):  
Fabrizio Ambrosino ◽  
Carlo Sabbarese ◽  
Flora Giudicepietro ◽  
Walter De Cesare ◽  
Mariagabriella Pugliese ◽  
...  
Keyword(s):  
Surface Layer ◽  
Surface Soil ◽  
Co2 Flux ◽  
Good Evidence ◽  
Campi Flegrei ◽  
Measuring Point ◽  
Volcanic Unrest ◽  
Campi Flegrei Caldera ◽  
Carrier Effect ◽  
Geochemical Parameters

The study concerns the analysis of 220Rn (thoron) recorded in the surface soil in two sites of the Campi Flegrei caldera (Naples, Southern Italy) characterized by phases of volcanic unrest in the seven-year period 1 July 2011–31 December 2017. Thoron comes only from the most surface layer, so the characteristics of its time series are strictly connected to the shallow phenomena, which can also act at a distance from the measuring point in these particular areas. Since we measured 220Rn in parallel with 222Rn (radon), we found that by using the same analysis applied to radon, we obtained interesting information. While knowing the limits of this radioisotope well, we highlight only the particular characteristics of the emissions of thoron in the surface soil. Here, we show that it also shows some clear features found in the radon signal, such as anomalies and signal trends. Consequently, we provide good evidence that, in spite of the very short life of 220Rn compared to 222Rn, both are related to the carrier effect of CO2, which has significantly increased in the last few years within the caldera. The hydrothermal alterations, induced by the increase in temperature and pressure of the caldera system, occur in the surface soils and significantly influence thoron’s power of exhalation from the surface layer. The effects on the surface thoron are reflected in both sites, but with less intensity, the same behavior of 222Rn following the increasing movements and fluctuations of the geophysical and geochemical parameters (CO2 flux, fumarolic tremor, background seismicity, soil deformation). An overall linear correlation was found between the 222−220Rn signals, indicating the effect of the CO2 vector. The overall results represent a significant step forward in the use and interpretation of the thoron signal.

New insights on the structural setting of the Pisciarelli fumarole field (Campi Flegrei caldera): implications for evolution and eruptive scenarios

2020 ◽  
Author(s):  
Roberto Isaia ◽  
Maria Giulia Di Giuseppe ◽  
Jacopo Natale ◽  
Francesco D'Assisi Tramparulo ◽  
Antonio Troiano ◽  
...  
Keyword(s):  
Hydrothermal Activity ◽  
Hydrothermal Systems ◽  
Seasonal Effects ◽  
Campi Flegrei ◽  
Geochemical Data ◽  
Fluid Circulation ◽  
Campi Flegrei Caldera ◽  
Structural Setting ◽  
Fumarole Field ◽  
Self Potential

<p>The Solfatara-Pisciarelli area, located in the active Campi Flegrei caldera (Italy) hosts an intense hydrothermal activity, whose shallower expression is controlled by a complex pattern of fractures and faults. Volcanological and structural studies may be the key to disclose the relationships between brittle structures and hydrothermal activity, as well as to understand the dynamic processes and possible eruption scenarios. For this purpose, we present the results of a volcanological and structural survey combined with Electrical Resistivity Tomography (ERT) and Self Potential data. Three ERT surveys has been performed in order to reconstruct the Pisciarelli structural setting and the relationships of the main fractures and faults with the underground fluid circulation. Two measured profiles crossing the main mud pool and fumaroles of Pisciarelli and has been repeated every three months to evaluate the possible influence of seasonal effects on the hydrothermal system. These profiles performed during the last year have been compared with a first ERT prospection carried on in correspondence of a 100 m long survey line, which crosses along the W-E direction the Pisciarelli permanent mud pool and its main fumarole. The comparison of the results with temperature, geochemical data and rainfall rates allowed to separate the areas dominated by seasonal effects from areas where deeper injected gasses cumulate in the subsoil. Further indication on the fluid circulation and structures derived by a mapping of the self-potential anomaly realized for the whole Solfatara-Pisciarelli area. The rocks exposed in the Pisciarelli area host a large number of faults and fractures, the latter often related to fault damage zones. Cross-cutting fault and fracture relationships and their relations with the volcanic sequences suggest that NW-SE and NE-SW trending faults are sealed by Solfatara deposits (4.28 ka); whereas E-W and N-S trending faults cross-cut the youngest volcanic succession (Astroni deposits, 4.25 ka). Several landslide deposits were recognized in the higher part of the Pisciarelli fumarole field, mainly due to intense rock fracturing, hydrothermal alteration, mud-pool activity and steep relieves surrounding the mud pool. Ancient landslide deposits overlying mud sediments, similar to those nowadays forming within the active mud pool, cropping out along the slope, at about 5 meters above the present mud pool level. New landslide phenomena could seal off the mud pool and fumaroles of Pisciarelli, with a possible consequence to trigger an hydrothermal explosions as described for other hydrothermal systems in the world.</p>

scholarly journals Magma injection beneath the urban area of Naples: a new mechanism for the 2012–2013 volcanic unrest at Campi Flegrei caldera

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Luca D’Auria ◽  
Susi Pepe ◽  
Raffaele Castaldo ◽  
Flora Giudicepietro ◽  
Giovanni Macedonio ◽  
...  
Keyword(s):  
Urban Area ◽  
Campi Flegrei ◽  
Volcanic Unrest ◽  
Campi Flegrei Caldera

scholarly journals Continuous radon monitoring during seven years of volcanic unrest at Campi Flegrei caldera (Italy)

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
C. Sabbarese ◽  
F. Ambrosino ◽  
G. Chiodini ◽  
F. Giudicepietro ◽  
G. Macedonio ◽  
...  
Keyword(s):  
Campi Flegrei ◽  
Volcanic Unrest ◽  
Campi Flegrei Caldera ◽  
Radon Monitoring

scholarly journals The Campi Flegrei caldera unrest: Discriminating magma intrusions from hydrothermal effects and implications for possible evolution

2019 ◽  
Vol 188 ◽  
pp. 108-122 ◽  
Author(s):  
Claudia Troise ◽  
Giuseppe De Natale ◽  
Roberto Schiavone ◽  
Renato Somma ◽  
Roberto Moretti
Keyword(s):  
Campi Flegrei ◽  
Campi Flegrei Caldera ◽  
Caldera Unrest
Sign in / Sign up

Export Citation Format

Share Document