Integrated tomographic methods for seismic imaging and monitoring of volcanic caldera structures and geothermal areas

Amoroso, Ortensia; Festa, Gaetano; Bruno, Pier Paolo; D’Auria, Luca; Landro, Grazia De; Fiore, Vincenzo Di; Gammaldi, Sergio; Maraio, Stefano; Pilz, Marco; Roux, Philippe; Russo, G.; Serlenga, Vincenzo; Serra, Marcello; Woith, Heiko; Zollo, Aldo

doi:10.1016/j.jappgeo.2017.11.012

Cited by 17 publications

(9 citation statements)

References 65 publications

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“…Geochemistry, Geophysics, Geosystems Similar signals, recorded at Old Faithful geyser in Yellowstone National Park (USA), have been analyzed by Kedar et al (1996), who found the harmonic motion to be caused by elastic waves reverberating in a solid medium such as a near-surface soft layer. Applying the Kedar formula f = Vs/4h to our data with f = 10 Hz and Vs = 200 m/s (Bruno et al, 2007), it gives us the result of h = 5 m. This estimate is consistent with the results reported in the literature for the hydrothermal areas of Solfatara and Pisciarelli (Amoroso et al, 2018;Bruno et al, 2007;De Landro et al, 2017;Di Giuseppe & Troiano, 2019;Gresse et al, 2018). The study of the fumarolic tremor source mechanism is important to define quantitative relationships between the generation of the seismic signal and the dynamics of hydrothermal fluids (gas and bubbling mud) at Pisciarelli.…”

Section: 1029/2019gc008610supporting

confidence: 90%

Insight Into Campi Flegrei Caldera Unrest Through Seismic Tremor Measurements at Pisciarelli Fumarolic Field

Giudicepietro

Chiodini

Caliro

et al. 2019

Geochem Geophys Geosyst

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Within a general volcanic unrest in the densely urbanized area of Campi Flegrei caldera (Italy) an increase in the activity of Pisciarelli hydrothermal area is occurring. The seismic amplitude of Pisciarelli fumarolic tremor is a proxy for the fluid emission rate of the entire Solfatara‐Pisciarelli hydrothermal system. The long‐term analysis indicates a significant increase, by a factor of ~3 of the fumarolic tremor amplitude since May 2017. This increment matches with the trend of geochemical and seismic parameters observed in Campi Flegrei, therefore highlighting that Pisciarelli is a key site to monitor the volcanic unrest underway in this high‐risk caldera. The analysis of data from three closely spaced seismic stations provided new clues about the source mechanism of the tremor. Analyzing the fumarolic tremor amplitude we could also identify an episode of enlargement of the emission area close to the main fumarole of Pisciarelli. We propose a monitoring system based on the fumarolic tremor analysis, which provides real‐time information on the Pisciarelli hydrothermal activity and therefore on the current unrest in Campi Flegrei caldera.

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Section: 1029/2019gc008610supporting

confidence: 90%

Insight Into Campi Flegrei Caldera Unrest Through Seismic Tremor Measurements at Pisciarelli Fumarolic Field

Giudicepietro

Chiodini

Caliro

et al. 2019

Geochem Geophys Geosyst

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“…Our modeling and 3D strength map therefore highlight the importance of monitoring the extent and evolution of hydrothermal alteration, and the formation of low-strength altered layers, at La Soufrière and at other active volcanoes worldwide. Such monitoring can be achieved, for example, using geophysical methods such as electrical tomography (Ahmed et al, 2018;Byrdina et al, 2017;Ghorbani et al, 2018;Rosas-Carbajal et al, 2016) and muon tomography (Lesparre et al, 2012;Rosas-Carbajal et al, 2017), near-surface seismic imaging (Amoroso et al, 2018), thermal and gas monitoring (de Moor et al, 2019;Edmonds et al, 2003;Jessop et al, 2021;Moretti et al, 2020;Tamburello et al, 2019), geological mapping (van Wyk de Vries et al, 2000), deformation monitoring (Moretti et al, 2020), magnetic methods (Finn et al, 2007), and remote and/or ground-based optical and spectroscopic methods (Crowley & Zimbelman, 1997;Darmawan et al, 2018;John et al, 2008;Kereszturi et al, 2020;Mueller et al, 2021). Further, although we document a reduction in strength as a function of alteration (Figure 5c), alteration can also increase strength and potentially promote volcanic instability by creating zones of high pore fluid pressure (Heap, Baumann, et al, 2021;Reid, 2004).…”

Section: Discussionmentioning

confidence: 99%

Alteration‐Induced Volcano Instability at La Soufrière de Guadeloupe (Eastern Caribbean)

et al. 2021

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Volcanoes are inherently unstable structures that are built haphazardly, in both space and time, from the products of successive effusive and explosive eruptions and endogenous growth. These materials have highly variable physical and mechanical properties (Heap & Violay, 2021) and often form oversteepened and unstable slopes. As a result, volcano deformation (such as volcano spreading; Borgia et al., 2000) and mass wasting events (such as debris avalanches resulting from partial flank collapse, lahars, and rockfalls;

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“…To perform the 3D seismic tomography, we used a method based on accurate finite difference travel-time computation and a simultaneous inversion of body wave travel times to infer velocity and source location parameters [32]. This method is well proven and used in many applications in tectonic regions and volcanic and geothermal areas using data from passive (e.g., [33][34][35]) and active surveys (e.g., [36,37]). In the case of datasets from active surveys, the source location parameters are not inverted and fixed to the known positions.…”

Section: <2 / /mentioning

confidence: 99%

4D Travel-Time Tomography as a Tool for Tracking Fluid-Driven Medium Changes in Offshore Oil–Gas Exploitation Areas

et al. 2020

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The monitoring of rock volume where offshore exploitation activities take place is crucial to assess the corresponding seismic hazard. Fluid injection/extraction operations generate a pore fluid pressure perturbation into the volume hosting the reservoir which, in turn, may trigger new failures and induce changes in the elastic properties of rocks. Our purpose is to evaluate the feasibility of reconstructing pore pressure perturbation diffusion in the host medium by imaging the 4D velocity changes using active seismic. We simulated repeated active offshore surveys and imaged the target volume. We constructed the velocity model perturbed by the fluid injection using physical modeling and evaluated under which conditions the repeated surveys could image the velocity changes. We found that the induced pressure perturbation causes seismic velocity variations ranging between 2–5% and 15–20%, depending on the different injection conditions and medium properties. So, in most cases, time-lapse tomography is very efficient in tracking the perturbation. The noise level characterizing the recording station sites is a crucial parameter. Since we evaluated the feasibility of the proposed 4D imaging strategy under different realistic environmental and operational conditions, our results can be directly applied to set up and configure the acquisition layout of surveys aimed at retrieving fluid-induced medium changes in the hosting medium. Moreover, our results can be considered as a useful starting point to design the guidelines to monitor exploitation areas.

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Integrated tomographic methods for seismic imaging and monitoring of volcanic caldera structures and geothermal areas

Cited by 17 publications

References 65 publications

Insight Into Campi Flegrei Caldera Unrest Through Seismic Tremor Measurements at Pisciarelli Fumarolic Field

Insight Into Campi Flegrei Caldera Unrest Through Seismic Tremor Measurements at Pisciarelli Fumarolic Field

Alteration‐Induced Volcano Instability at La Soufrière de Guadeloupe (Eastern Caribbean)

4D Travel-Time Tomography as a Tool for Tracking Fluid-Driven Medium Changes in Offshore Oil–Gas Exploitation Areas

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