Abstract
Series of studies is described in an attempt to extract regional characteristics from seismic intensity data, being start with a conviction that an iso-seismal map contains various information from source to site if it is estimated precisely and densely. The first step, a method for smoothing randomly distributed spatial data is presented by use of the second degree surface fitting based on the least squares method. The smoothing rate can be adjusted by changing the size of a circled domain in a surface fitting. A model for numerical test of the proposed method, Hokkaido district, Japan is chosen and idealized intensity data are composed considering two factors of geometrical attenuation from an epicenter and local soil effect. The soil effects are detected and separated from the composed intensity data by applying the proposed smoothing technique and an applicability is confirmed. This method is adopted for the 4 sets of intensity data in Hokkaido surveyed by means of questionnaire method precisely and densely. Iso-seismal maps with various degree of smoothing are drawn and general trends of iso-seismals are shown. Furthermore, from the deviation of two iso-seismal maps in different degree of smoothing, local site effects are extracted quantitatively.
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