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  • Nature Publishing Group  (2)
  • Seismological Society of America  (2)
  • American Physical Society
  • Seismological Society of America (SSA)
  • 2005-2009  (2)
  • 1970-1974  (2)
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Publisher
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Year
  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 251 (1974), S. 126-128 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Here I compare the average teleseismic P-residuals of four stations located near the San Andreas fault (Berkeley, BKS; Mt Hamilton, MHC; Priest, PRI; and Pasadena, PAS) to those of three stations to the East of it (Mineral, MIN; Jamestown, JAS, and; Golden, GOL) (Fig. 1). Since our interest is ...
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 245 (1973), S. 139-140 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The origin time and location of an earthquake are found by minimizing over all stations the difference between observed and computed arrival time using a standard earth model. As well as random experimental errors the residual at each station is in part due to the imperfection of the earthquake ...
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  • 3
    Publication Date: 2008-07-01
    Print ISSN: 0895-0695
    Electronic ISSN: 1938-2057
    Topics: Geosciences
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  • 4
    Publication Date: 2006-04-01
    Description: The earthquake catalog in southern Iceland between 20.25 degrees W and 21.3 degrees W is complete down to approximately M (sub w) 0 and shows no evidence for magnitude shifts as a function of time since 1991. This means that 6902 earthquakes (M〉 or =-0.1, depth 〈 or =20 km) are available for studies of seismicity patterns preceding the two M (sub S) 6.6 mainshocks in 2000, in their source volumes and vicinity (20.25 degrees W and 20.9 degrees W). The power law of the frequency-magnitude relationship holds down to M (sub 0) . Detailed mapping (including 3D mapping) of the b-value of the frequency- magnitude distribution shows that variations from b = 0.6 to 1.4 exist over distances of about 2 km. This suggests that the tectonic fabric in southern Iceland is heterogeneous on a small scale. The hypocenters of the two M (sub S) 6.6 mainshocks and one additional M 4.5 mainshock are associated with low b-values (0.6-0.8), statistically significantly different from volumes in their vicinity. Therefore, one can expect future mainshocks in southern Iceland to also emanate from volumes characterized by low b-values. However, the small dimensions of these asperities may render it difficult to identify them before the mainshocks occur. Low values of estimated local recurrence times (500-2000 years) map the two fault zones that ruptured in 2000 against a background of local recurrence times longer than 5000 years. The first of the two M 6.6 mainshocks emanated from a volume of short estimated local recurrence time. This supports the hypothesis that asperities with short local recurrence times control locations of major ruptures. Mapping of b-values in cross sections shows anomalies of high b at the bottom of the seismogenic crust, correlating with the change of its thickness in the middle of the study area. These high b-value anomalies, and other pockets of such anomalies at shallower depths, are best interpreted as caused by high pore pressure because evidence of fluids under high pressure is ubiquitous in this area.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
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