Hydrogen gas monitoring at Long Valley Caldera, California

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Description

In response to the need for closer, systematic monitoring of the Long Valley as a means of detecting changes that might precede volcanic activity in the area, a systematic program was begun to study hydrothermal activity and gas emissions. The initial effort to monitor hydrogen gas on one component of the gas phase that might be given off by an ascending body of magma is described. Hydrogen is a component of most magmatic gases, and there is now evidence for the release of hydrogen from magmas at shallow crustal depths prior to volcanic eruptions. Hydrogen may also be produced in ... continued below

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Pages: 12

Creation Information

McGee, K.A.; Casadevall, T.J.; Sato, M.; Sutton, A.J. & Clark, M.D. January 1, 1982.

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Description

In response to the need for closer, systematic monitoring of the Long Valley as a means of detecting changes that might precede volcanic activity in the area, a systematic program was begun to study hydrothermal activity and gas emissions. The initial effort to monitor hydrogen gas on one component of the gas phase that might be given off by an ascending body of magma is described. Hydrogen is a component of most magmatic gases, and there is now evidence for the release of hydrogen from magmas at shallow crustal depths prior to volcanic eruptions. Hydrogen may also be produced in tectonically active areas by hydration reactions of rock-forming minerals with ground waters at depths where frictional stress results in moderately elevated temperatures. Because hydrogen is extremely mobile and relatively non-reactive once formed, it should ascend to the surface mobile and relatively non-reactive once formed, it should ascend to the surface easily through incipient fractures developed in tectonic fault zones. For these reasons, anomalous hydrogen emissions in the Long Valley area may be a good geochemical indication of tectonic or magmatic events.

Physical Description

Pages: 12

Notes

US Geological Survey, Open-File Service, Box 25425, Denver Federal Center, Denver, CO 80225.

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  • Other: DE84900456
  • Report No.: USGS-OFR-82-930
  • Grant Number: None
  • DOI: 10.2172/5284495 | External Link
  • Office of Scientific & Technical Information Report Number: 5284495
  • Archival Resource Key: ark:/67531/metadc1069262

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • January 1, 1982

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

Description Last Updated

  • March 28, 2018, 1:47 p.m.

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McGee, K.A.; Casadevall, T.J.; Sato, M.; Sutton, A.J. & Clark, M.D. Hydrogen gas monitoring at Long Valley Caldera, California, report, January 1, 1982; United States. (digital.library.unt.edu/ark:/67531/metadc1069262/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.