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1 results

  • Automatic methods for generating seismic intensity maps

  • Part of
  • David R. Brillinger, Chang Chiann, Rafael A. Irizarry, Pedro A. Morettin
  • Journal:
    Journal of Applied Probability / Volume 38 / Issue A / 2001
    Published online by Cambridge University Press:
    14 July 2016, pp. 188-201
    Print publication:
    2001

  • For many years the modified Mercalli (MM) scale has been used to describe earthquake damage and effects observed at scattered locations. In the next stage of an analysis involving MM data, isoseismal lines based on the observations have been added to maps by hand, i.e. subjectively. However a few objective methods have been proposed (by e.g. De Rubeis et al., Brillinger, Wald et al. and Pettenati et al.). The work presented here develops objective methods further. In particular the ordinal character of the MM scale is specifically taken into account. Numerical smoothing is basic to the approach and methods involving splines, local polynomial regression and wavelets are illustrated. The approach also allows the inclusion of explanatory variables, for example site effects. The procedure is implemented for data from the 17 October 1989 Loma Prieta earthquake.