Diffusive helium emissions as a precursory sign of volcanic unrest

Padrón, Eleazar; Pérez, Nemesio M.; Hernández, Pedro A.; Sumino, Hirochika; Melián, Gladys V.; Barrancos, José; Nolasco, D.; Padilla, Germán D.; Dionis, Samara; Rodríguez, Fátima; Hernández, I.; Calvo, David; Peraza, M. D.; Nagao, Keisuke

doi:10.1130/g34027.1

Cited by 78 publications

(63 citation statements)

References 18 publications

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“…As shown in previous studies at other sites (e.g., Padrón et al, 2012Padrón et al, , 2013 helium measurements might also work well in the Basin-and-Range Province, since helium is an inert gas and does not react with surrounding rocks, geothermal fluids or groundwater. It could, therefore, be an excellent indicator of a structural connection between deep-seated geothermal reservoirs and surface degassing anomalies.…”

Section: Survey Planning and Optimizationmentioning

confidence: 87%

Diffuse surface emanations as indicator of structural permeability in fault-controlled geothermal systems

Jolie

Klinkmueller

Moeck

2015

Journal of Volcanology and Geothermal Research

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Section: Survey Planning and Optimizationmentioning

confidence: 87%

Diffuse surface emanations as indicator of structural permeability in fault-controlled geothermal systems

Jolie

Klinkmueller

Moeck

2015

Journal of Volcanology and Geothermal Research

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“…Lead-glass sampling bottles with volumes of about 50 cm 3 and with high-vacuum stopcocks at both ends were totally filled with water to sample for dissolved gas. The gas was then extracted by ultrasonic vibration and quantitatively collected into a small volume (10 cm 3 ) following the method described in Padrón et al (2013). The determination of helium isotopic ratios as well as 4 He and 20 Ne concentrations is done following the method described by Sumino et al (2001).…”

Section: Methodsmentioning

confidence: 99%

Evidence from acoustic imaging for submarine volcanic activity in 2012 off the west coast of El Hierro (Canary Islands, Spain)

et al. 2014

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We report precursory geophysical, geodetic, and geochemical signatures of a new submarine volcanic activity observed off the western coast of El Hierro, Canary Islands. Submarine manifestation of this activity has been revealed through acoustic imaging of submarine plumes detected on the 20-kHz chirp parasound subbottom profiler (TOPAS PS18) mounted aboard the Spanish RV Hespérides on June 28, 2012. Five distinct "filament-shaped" acoustic plumes emanating from the flanks of mounds have been recognized at water depth between 64 and 88 m on a submarine platform located NW El Hierro. These plumes were well imaged on TOPAS profiles as "flares" of high acoustic contrast of impedance within the water column. Moreover, visible plumes composed of white rafts floating on the sea surface and sourcing from the location of the submarine plumes were reported by aerial photographs on July 3, 2012, 5 days after acoustic plumes were recorded. In addition, several geophysical and geochemical data support the fact that these submarine vents were preceded by several precursory signatures: (i) a sharp increase of the seismic energy release and the number of daily earthquakes of magnitude ≥2.

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“…Continuous monitoring of 3 He/ 4 He isotope ratio in diffuse helium flux for forecasting volcanic eruptions could strengthen existing surveillance programs [35]. Standard diffuse degassing methods focus on detecting percolated CO 2 and H 2 S gas as precursors to volcanic eruptions [36].…”

Section: He/ 4 He Ratio Measurements As An Indicator Of Volcanic Unrestmentioning

confidence: 99%

Computer Modeling of an Ion Trap Mass Analyzer, Part I: Low Pressure Regime

Nikolić

Madzunkov

Darrach

2015

J. Am. Soc. Mass Spectrom.

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Abstract. We present the multi-particle simulation program suite Computational Ion Trap Analyzer (CITA) designed to calculate the ion trajectories within a Paul quadrupole ion trap developed by the Jet Propulsion Laboratory (JPL). CITA uses an analytical expression of the electrodynamic field, employing up to six terms in multipole expansion and a modified velocity-Verlet method to numerically calculate ion trajectories. The computer code is multithreaded and designed to run on sharedmemory architectures. CITA yields near real-time simulations with full propagation of 26 particles per second per core. As a consequence, a realistic numbers of trapped ions (100+ million) can be used and their trajectories modeled, yielding a representative prediction of mass spectrometer analysis of trace gas species. When the model is compared with experimental results conducted at low pressures using the conventional quadrupole and dipole excitation modes, there is an excellent agreement with the observed peak shapes. Owing to the program's efficiency, CITA has been used to explore regions of trapping stability that are of interest to experimental research. These results are expected to facilitate a fast and reliable modeling of ion dynamics in miniature quadrupole ion trap and improve the interpretation of observed mass spectra.

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Diffusive helium emissions as a precursory sign of volcanic unrest

Cited by 78 publications

References 18 publications

Diffuse surface emanations as indicator of structural permeability in fault-controlled geothermal systems

Diffuse surface emanations as indicator of structural permeability in fault-controlled geothermal systems

Evidence from acoustic imaging for submarine volcanic activity in 2012 off the west coast of El Hierro (Canary Islands, Spain)

Computer Modeling of an Ion Trap Mass Analyzer, Part I: Low Pressure Regime

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