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  • 1
    Electronic Resource
    Electronic Resource
    Precise temperature measurement of groundwater for earthquake-prediction study (1984)
    Springer
    Pure and applied geophysics 122 (1984), S. 164-174 
    Details
    ISSN: 1420-9136
    Keywords: Groundwater temperature ; Earthquake prediction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Precise measurements of groundwater temperature, with a resolution of 0.0001°C, have been made for the purpose of earthquake prediction at four water wells in the Tokai district in Japan. The characteristics of temporal variations in groundwater temperature differ from well to well. From records of a well located in an area where use of groundwater is heavy, movement of groundwater was sensed by temperature variations. By contrast, water temperatures in a 500 m well far from cultural areas were extremely steady, with fluctuations of less than 0.0005°C. This well appears to be suitable for monitoring possible temperature changes related to the occurrence of an impending large earthquake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00874590
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Short-term and intermediate-term geochemical precursors (1988)
    Springer
    Pure and applied geophysics 126 (1988), S. 267-278 
    Details
    ISSN: 1420-9136
    Keywords: Earthquake prediction ; radon ; groundwater ; geochemical precursor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Detection of precursory phenomena in observation data is essential to earthquake prediction studies. Continuous monitoring of radon concentration in groundwater in Japan in one case showed a short-term anomaly related to a nearby earthquake. With the exception of the 1978 Izu-Oshimakinkai earthquake (M7.0), however, no abnormal change has been noted. This may be due partially to difficulty in detecting insignificant precursory signals from observation data, which ordinarily contains a noise-induced fluctuations, and partially to lack of understanding of the mechanism controlling the appearance of precursory phenomena. In order to increase our knowledge of the variation pattern of precursory changes in radon concentration of groundwater, hydrologic precursors with significant features are examined in this paper. Complexity of appearance of precursory phenomena and problems in assignment of the specific earthquake are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00878999
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  • 3
    Electronic Resource
    Electronic Resource
    Rare Earth and Other Elemental Abundances in the Allende Meteorite (1970)
    [s.l.] : Nature Publishing Group
    Nature 227 (1970), S. 478-479 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We have determined the abundances (Table 1) of twenty-eight chemical elements, including eight elements previously reported. Abundances of Al, Ca, V, Mn, Na, Sc, Cr, Fc and Co were analysed in two grams of an interior sample by instrumental neutron activation analysis2. In another interior specimen ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/227478a0
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  • 4
    Electronic Resource
    Electronic Resource
    3 He/ 4 He ratios of marine ferromanganese nodules (1985)
    [s.l.] : Nature Publishing Group
    Nature 317 (1985), S. 518-520 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Based on their physical and chemical signatures, marine ferromanganese nodules are generally considered to be generated in two major environments1"3: diagenetic and hydrogenetic. The diagenetic type is characterized by a high Mn-to-Fe ratio (Mn/Fe^2.5), enrichment of trace elements such as Co, Ni ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/317518a0
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  • 5
    Electronic Resource
    Electronic Resource
    3 He/ 4 He ratios in CH 4 -rich natural gases suggest magmatic origin (1983)
    [s.l.] : Nature Publishing Group
    Nature 305 (1983), S. 792-794 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The characteristic greenish colour of the altered volcanic rocksin the Green Tuff is considered to be a result of diagenetic and hydrothermal alterations. Volcanic and sedimentary piles up to several thousand metres thick distributed in the region are attributed to subsidence and subsequent ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/305792a0
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  • 6
    Electronic Resource
    Electronic Resource
    Helium flux in a continental land area estimated from 3 He/ 4 He ratio in northern Taiwan (1986)
    [s.l.] : Nature Publishing Group
    Nature 323 (1986), S. 55-57 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In spite of the ease with which helium escapes from the upper part of the atmosphere to interplanetary space because of its low atomic mass, the terrestrial atmosphere contains an appreciable amount of helium with a concentration of 5.24x 10~6 byvolume. This has been attributed to a supply from the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/323055a0
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  • 7
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    3He/4He ratios of pore gases in pore water and chemical composition of sediments at DSDP Sites 87-583 and 87-584
    PANGAEA
    In:  Supplement to: Sano, Yuji; Wakita, Hiroshi (1986): 3He/4He ratios of pore gases in pore water, Sites 583 and 584. In: Kagami, H; Karig, DE; Coulbourn, WT; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 87, 861-864, https://doi.org/10.2973/dsdp.proc.87.132.1986
    Details
    Publication Date: 2023-05-12
    Description: We have measured the 3He/4He and 20Ne/4He ratios of gases dissolved in the pore water in sediments at two sites in the Nankai Trough (Site 583) and the Japan Trench (Site 584). The 3He/4He and 20Ne/4He ratios vary from 0.215 * 10**-6 to 1.23 * 10**-6 and from 50 * 10**-3 to 2700 * 10**-3, respectively. These values can be explained by mixing two components, one from the atmosphere and one with a 3He/4He ratio of (0.2 to 0.3) * 10**-6. The latter component may be derived from the ocean crust near the subduction zone.
    Keywords: Deep Sea Drilling Project; DSDP
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 8
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    (Table 1) 3He/4He and 4He/20Ne ratios of pore gases in sediment at DSDP Sites 84-568 and 90-594
    PANGAEA
    In:  Supplement to: Wakita, Hiroshi; Sano, Yuji; Fujii, Naoyuki; Takeuchi, Akira (1986): 3He/4He ratios of pore gases in deep-sea sediments, Legs 89 and 90. In: Kennett, JP; von der Borch, CC; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 90, 1261-1263, https://doi.org/10.2973/dsdp.proc.90.134.1986
    Details
    Publication Date: 2023-06-27
    Description: Studies on He isotope ratios of gas and rock samples in various parts of the world have shown a close relation between the 3He/4He ratio and geotectonic features of the sampling area. Emission of primordial He is commonly found in gases and fluid in Cenozoic volcanic areas (mid-ocean ridges, hot spots, and subduction zones), whereas that of radiogenic He is predominant in continental areas. Thus, the 3He/4He ratio is considered a useful tool for evaluating a variety of geotectonic environments.
    Keywords: 84-568_Site; 90-594_Site; COMPCORE; Composite Core; Deep Sea Drilling Project; DEPTH, sediment/rock; DSDP; Event label; Glomar Challenger; Helium-3/Helium-4; Helium-3/Helium-4, standard deviation; Helium-4/Neon-20; Leg84; Leg90; Mass spectrometry; North Pacific/SLOPE; Sample, optional label/labor no; see reference(s); South Pacific/CONT RISE
    Type: Dataset
    Format: text/tab-separated-values, 36 data points
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  • 9
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    (Table 1) 3He/4He and 4He/20Ne ratios in pore water and gas in deep-sea sediments at DSDP Site 111-504B
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 111-504B; Calculated; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; Helium-3/Helium-4; Helium-3/Helium-4, standard deviation; Helium-4/Neon-20; Isotope ratio mass spectrometry; Joides Resolution; Leg111; North Pacific Ocean; Sample type
    Type: Dataset
    Format: text/tab-separated-values, 37 data points
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  • 10
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    (Table 1) 3He/4He and 4He/20Ne ratios in pore water and gas in deep-sea sediments at DSDP Site 87-583F
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 87-583F; Calculated; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Helium-3/Helium-4; Helium-3/Helium-4, standard deviation; Helium-4/Neon-20; Isotope ratio mass spectrometry; Leg87; North Pacific; Sample type
    Type: Dataset
    Format: text/tab-separated-values, 12 data points
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