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  • GEOPHYSICS  (5)
  • Acoustic noise
  • Ascomycota/genetics
  • 1990-1994  (5)
  • 1985-1989  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Implications for the thermal regime of acoustic noise measurements in Crater Lake, Mount Ruapehu, New Zealand (1994)
    Springer
    Bulletin of volcanology 56 (1994), S. 493-501 
    Details
    ISSN: 1432-0819
    Keywords: Acoustic noise ; Steam ; Crater lake Volcano ; Ruapehu
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Hydrophone measurements of acoustic noise levels in the Crater Lake of Mount Ruapehu, New Zealand were made on 18 January 1991 from an inflatable rubber boat on the lake. The greatest sound pressures were recorded in the 1–10 Hz band, with sound levels generally decreasing about 20 dB per decade from 10 Hz to 80 kHz. The low frequency noise did not have an obvious relationship to the tremor observed at a seismic station within 1 km of the lake. The comparatively low levels of middle and high frequency sound meant that at the time of measurement, direct steam input did not make a significant contribution to the heating of Crater Lake. This is consistent with the earlier conclusion that during the last decade a major part of the heat input of Crater Lake has come from lake water that was heated below the lake and recycled back into the lake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00302830
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Unusual mutational mechanisms and evolution (1993)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1993-06-25
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hurst, L D -- Grafen, A -- New York, N.Y. -- Science. 1993 Jun 25;260(5116):1959; author reply 1959-60.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8316838" target="_blank"〉PubMed〈/a〉
    Keywords: Ascomycota/genetics ; *Biological Evolution ; DNA, Fungal/genetics ; Genome, Fungal ; *Mutation ; Neurospora crassa/genetics ; Point Mutation
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 3
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    Absolute far-field displacements from the 28 June 1992 Landers earthquake sequence (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Displacements observed for the Landers earthquake indicate that the depth of the bottom of the rupture is shallower towards the northern end. Displacements were dominantly symmetric and the rupture extended farther south on the Johnson Valley fault than has been mapped on the basis of surface ground offsets. The combined geodetic moment for the Landers and Big Bear earthquakes agrees well with teleseismic estimates.
    Keywords: GEOPHYSICS
    Type: Nature (ISSN 0028-0836); 361; 6410; p. 340-342.
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Global geodesy using GPS without fiducial sites (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Baseline lengths and geocentric radii have been determined from GPS data without the use of fiducial sites. Data from the first GPS experiment for the IERS and Geodynamics (GIG '91) have been analyzed with a no-fiducial strategy. A baseline length daily repeatability of 2 mm + 4 parts per billion was obtained for baselines in the Northern Hemisphere. Comparison of baseline lengths from GPS and the global VLBI solution GLB659 (Caprette et al. 1990) show rms agreement of 2.1 parts per billion. The geocentric radius mean daily repeatability for all sites was 15 cm. Comparison of geocentric radii from GPS and SV5 (Murray et al. 1990) show rms agreement of 3.8 cm. Given n globally distributed stations, the n(n - 1)/2 baseline lengths and n geocentric radii uniquely define a rigid closed polyhedron with a well-defined center of mass. Geodetic information can be obtained by examining the structure of the polyhedron and its change with time.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 19; 131-134
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    GPS measurements of crustal deformation associated with the 22 April 1991, Valle de la Estrella , Costa Rica earthquake (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Results are presented for analysis of Global Positioning System (GPS) measurements made at sites in Costa Rica in February and July 1991. Significant horizontal and vertical displacements relative to February positions were observed. Differences were found in GPS derived vertical and horizontal displacements as compared to other types of geodetic measurements of uplift in the coastal regions. A slip dislocation model which fits the GPS measured displacement was computed. Differences between these data sets and their associated models were investigated in light of unmodeled slip heterogeneity on the fault and post-seismic displacements.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 20; 5; p. 407-410.
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Improved sea level monitors for measuring vertical crustal deformation in the Shumagin seismic gap, Alaska (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The relative vertical deformation detection capability of a network of sea level gauges in the Shumagin seismic gap, Alaska has been improved. An examination of the present noise levels suggests that the network is now capable of providing relative deformation data that is quieter than data from leveling, GPS, VLBI, or satellite laser ranging.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 14; 1234-123
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    A densely spaced array of sea level monitors for the detection of vertical crustal deformation in the Shumagin seismic gap, Alaska (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A network of sea level gauges has been installed with about 40 km spacing in the Shumagin Islands in order to detect relative vertical motion, in particular, possible crustal motion precursory to an expected major earthquake. This required the development and deployment of a pressure sensor sea level gauge suitable for installation on remote and harsh coastlines. Data are collected in near-real-time via satellite, both in order to exploit fully any precursors that may be observed and to provide continuous information on the status of the instruments. Using Wiener filtering techniques, it has been determined conservatively that no relative vertical crustal motion greater than 0.1 m between stations has occurred during 1981-1985. This is consistent with independent geodetic leveling and trilateration data, though evidence exists for more rapid deformation during 1978-1980. The sea level data collected so far have an rms noise level of about 0.04 m after processing; this is limited in part by the pressure sensor and associated electronics. Improved prressure gauges with better long-term stability have recently been installed. A short-baseline tiltmeter operating in a tunnel has demonstrated that suitably designed and located land-based tiltmeters have a lower noise level, and hence better precursor detection characteristics than the sea level gauges, at monthly and shorter periods.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 91; 9067-908
    Format: text
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    NASA TECHNICAL REPORTS
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