Broad-Scale Mapping of Ground Shaking for a Scenario Earthquake Using the Digital National Land

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In order to develop the broad-scale mapping technique of ground shaking for a scenario earth quake, attenuation characteristics of peak ground motions are examined based on strong motion recordings from 33 Japanese earthquakes. Considering the different attenuation rates from the regression analysis for the records, the attenuation relationships for peak ground acceleration and velocity, which are applicable to both shallow and deeper earthquakes, are proposed. According to local site effects, nonlinearity of site amplification is examined by using the ground motion records of the 2001 Geiyo earthquake and subsequent smaller events. The analysis of the amplification factors derived from the records of the Geiyo earthquake together with those of the 1989 Loma Prieta and 1994 Northridge earthquakes indicates that the nonlinear effect n peak ground velocity is not apparent up to the strain level of about 1×10^<-3>. Based on these results, the broad-scale mapping technique of ground shaking for a scenario earthquake is developed. In order to confirm the validity of the ground-shaking mapping techniques, the distributions of seismic intensity calculated from the techniques are compared with the actual isoseismal maps during the Miyagi-ken-oki earthquake on May 26, the Miyagi-ken-hokubu earthquake on July 26, and the Tokachi-oki earthquake on September 26 in 2003. A comparison for the earthquake shows that the computed maps are in good agreement with the observed map.