Journal ArticleDOI
Hydrogen release: new indicator of fault activity.
Reads0
Chats0
TLDR
The hydrogen concentration in soil gas has been measured in the area around the Yamasaki Fault, one of the active faults in southwestern Japan, and a hypothesis on the production of hydrogen by fault movements is postulated.Abstract:
The hydrogen concentration in soil gas has been measured in the area around the Yamasaki Fault, one of the active faults in southwestern Japan. Degassing of a significant amount of hydrogen (up to more than 3 percent by volume) has been observed for sites along the fault zone. The hydrogen concentration in soil gas at sites away from the fault zone was about 0.5 part per million, almost the same as that found in the atmosphere. The spatial distribution of sites with high hydrogen concentrations is quite systematic. A hypothesis on the production of hydrogen by fault movements is postulated.read more
Citations
More filters
Journal ArticleDOI
A hydrogen-based subsurface microbial community dominated by methanogens
Francis H. Chapelle,Kathleen O'Neill,Paul M. Bradley,Barbara A. Methé,Stacy Ciufo,LeRoy L. Knobel,Derek R. Lovley +6 more
TL;DR: This work describes a unique subsurface microbial community in which hydrogen-consuming, methane-producing Archaea far outnumber the Bacteria and demonstrates that hydrogen-based methanogenic communities do occur in Earth's subsurfaces, providing an analogue for possible subsurfaced microbial ecosystems on other planets.
Journal ArticleDOI
Gas geochemistry and seismotectonics: a review
TL;DR: In this article, the main sources, behaviours and uses of species detected in soils and springs are displayed, and their mode of sampling and analysing briefly described, and the main patterns of degassing in soils are described and a wide range of geochemical signatures as the result of both permeability and mineralogical contrasts.
Journal ArticleDOI
Hydrogen generation from mantle source rocks in Oman
C. Neal,G. Stanger +1 more
TL;DR: In this article, it is suggested that hydrogen generation in mantle source rocks at depth and in the early Archaean surface environment may be more widespread than has hitherto been realised, which is normally a cryptic process in the hydrosphere but is fortuitously revealed by the unusual hydrogeological conditions in Oman where atmospheric oxygen is totally assimilated.
Journal ArticleDOI
Gas geochemistry applied to earthquake prediction: An overview
TL;DR: In this paper, the authors studied the anomalous high concentrations of radon, helium, hydrogen, mercury, carbon dioxide, and several other volatiles along active faults, suggesting that the faults may be paths of least resistance for the terrestrial gases generated or stored in the earth to escape to the atmosphere.
Journal ArticleDOI
Geochemical Precursors to Seismic Activity
TL;DR: In this article, the aquifer breaching/fluid mixing (AB/FM) model was proposed to account for many of the reported changes in temperature, dissolved ion and dissolved gas concentrations in groundwater.
References
More filters
Journal ArticleDOI
Excess 3He in deep water on the East Pacific Rise
TL;DR: In this article, the authors show that water on the crest and flanks of the East Pacific Rise has the highest enrichment in 3He so far observed in the oceans; the 3He/4He ratio anomaly relative to atmospheric helium is + 32% at the mid-depth maximum in the profiles.
Journal ArticleDOI
Helium in the terrestrial atmosphere
TL;DR: In this article, a brief historical review of the discovery of helium in the terrestrial atmosphere, the production mechanisms of the isotopes He4 and He3 are discussed and different mechanisms proposed to explain the presence of the winter helium bulge are discussed.
Journal ArticleDOI
"Helium spots": caused by a diapiric magma from the upper mantle.
TL;DR: "Helium spots," where a significant amount of helium is present in the soil, have been found along the fault zone formed by the 1966 Matsushiro swarm earthquakes, and are interpreted as the results of a diapiric uprise of a magma approximately 1 kilometer in diameter.
Journal ArticleDOI
Zur Oberflächenchemie von mechanisch aktiviertem Quarz
TL;DR: In this article, the spin concentrations of the groups in the different charges of milling were analyzed using ESR measurement, methoxylation, acid-exchange and hydrogen formation.