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  • Key words: Historical earthquakes, macroseismic data, pictorial data, earthquake catalogues, seismicity re-evaluation.  (1)
  • tensile fracturing  (1)
  • 1
    Electronic Resource
    Electronic Resource
    European Earthquakes in the 18th Century through Contemporary Pictorial Documentation (1997)
    Springer
    Pure and applied geophysics 150 (1997), S. 305-327 
    Details
    ISSN: 1420-9136
    Keywords: Key words: Historical earthquakes, macroseismic data, pictorial data, earthquake catalogues, seismicity re-evaluation.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract. —Written and printed historical records and reports have always been the main sources of macroseismic information for seismologists re-evaluating the earthquakes of the past, and hence for the authors of regional historical earthquake catalogues. The most recent attempts to re-assess the seismicity of European regions have also looked for new, not previously utilised, complementary macroseismic data, with a view to allowing new and improved assessments to be made of historical earthquake intensities. In the present paper an attempt is made to test the utility of historical pictorial material from this point of view.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050078
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  • 2
    Electronic Resource
    Electronic Resource
    Do some shallow earthquakes have a tensile source component? (1986)
    Springer
    Pure and applied geophysics 124 (1986), S. 825-840 
    Details
    ISSN: 1420-9136
    Keywords: Physical modelling ; tensile fracturing ; shallow earthquakes ; tensile source component
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The laboratory tests carried out in studying shear and tensile seismogenic displacements occurring in compressed samples, led us to search for earthquakes with a tensile source component. To determine this component in the seismic focus, a special procedure based on the construction of radiation patterns of the combined shear-tensile type is introduced. The criteria for selecting the events produced by the combined source mechanism are listed, and their limitations are mentioned. From the seismic zones with good azimuthal distribution of stations in the world seismic network nine earthquakes which occurred in the 6-year period 1976–1981 were analyzed; for these events better agreement of the observed and theoretical patterns was found for the combined shear-tensile source mechanism than for the pure double-couple mechanism. However, the share of the tensile component was always, found to be relatively small, ranging from 1 to 13 percent of the shear component. The comparison of the two solutions (double-couple vs. combined shear/tensile) is based on the first onset signs statistics. The results obtained indicate that tensile fracturing does not play a substantial role in the total amount of released seismic energy; on the orther hand, it is expected to be more important in the creation and development of focal zone morphology from both the instantaneous and long-term point of view.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00879613
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