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Geoscientists have discovered the first direct evidence that material from deep within Earth's mantle transition zone -- a layer rich in water, crystals and melted rock -- can percolate to the surface...
When dormant volcanoes are about to erupt, they show some predictive characteristics—seismic activity beneath the volcano starts to increase, gas escapes through the vent, or the surrounding ground st...
Gas discharges from four remote volcanoes in northern Chile (Putana, Olca, Irruputuncu and Alitar): a geochemical survey
Fluid geochemistry Subduction zone Volcanic risk Geochemical data Volcano monitoring
2015/8/27
We analyzed gas samples collected from fumaroles and bubbling pools at Irruputuncu, Putana, Olca and Alitar volcanoes located in the central Andes volcanic zone (northern Chile). The Irruputuncu and P...
Monitoring active volcanoes: The geochemical approach
Active volcanoes geochemistry volcanic activity lava dissolving volatiles
2015/8/27
The geochemical surveillance of an active volcano aims to recognize possible signals that are related to changes in volcanic activity. Indeed, as a consequence of the magma rising inside the volcanic ...
Expedition to the Aleutian Islands:Geoscientists head to remote Alaska volcanoes
the Aleutian Islands Geoscientists head Alaska volcanoes
2015/8/13
This is the 11th part in a series on NSF's geosciences risk and resilience interest area. Please see parts one, two, three,four, five, six, seven, eight, nine...
Three quarters of Earth's volcanic activity occurs beneath the sea, predominantly along the extensive mid-ocean ridge system that winds its way through the major ocean basins. The style of eruptive ac...
Volcanoes, including Mount Hood, can go from dormant to active quickly（图）
Volcanoes including Mount Hood dormant
2014/3/20
A new study suggests that the magma sitting 4-5 kilometers beneath the surface of Oregon's Mount Hood has been stored in near-solid conditions for thousands of years, but that the time it takes to liq...
New information concerning clay mineral provenance in mud volcanoes
Eastern Mediterranean Mud volcanoes Clay mineralogy
2011/11/8
X ray-powder diffraction (XRD) analyses were conducted on matrix mud breccia samples from the MEDINETH expedition to the eastern Mediterranean mud volcano fields. The clay assemblage is dominated by h...
Monitoring of temporal and spatial variations in fumarole helium and carbon dioxide characteristics at Poás and Turrialba volcanoes, Costa Rica (2001-2009)
helium isotopes carbon isotopes Central America Costa Rica volcano monitoring
2017/8/9
We report results of a 9-year monitoring program that took place from 2001 to 2009 of the helium and carbon isotope (3He/4He, δ13C) and relative abundances ratios (CO2/3He) of fumarole sites at Poás a...
Geochemical Characteristics of Mafic and Intermediate Volcanic Rocks from the Hasandağ and Erciyes Volcanoes (Central Anatolia, Turkey)
Central Anatolia collision volcanism lithospheric delamination Turkey
2009/7/7
Hasandağ and Erciyes stratovolcanoes, which are the two important stratovolcanoes in Central Anatolia, erupted volcanic products with both calc-alkaline and alkaline compositions, although the c...
Fluxes of volatiles (H2O, CO2, N2, Cl, F) from arc volcanoes
volcanoes fluxes water halogens sources
2017/8/10
This review gives an overview of the estimates of volatile emissions from arc and mid-ocean ridge volcanoes to the atmosphere and hydrosphere with particular focus on H2O, CO2, N2, Cl and F. The gas c...