抄録
A mapping of shear-wave velocity for al of Japan is performed using “Japan Engineering Geomorphologic Clasification Map (JEGM)” which has been developed as a GIS-based ground condition map. At first, we calculate the average shear-wave velocity in the upper 30m (AVS30), which is a simple and useful predictor for estimating site amplification factors of peak ground velocity (PGV), for approximately 2,000 sites where shear-wave velocity has been measured in al over Japan. Geomorphologic units for al boreholes logging data are interpreted using land-clasification maps that are the base paper maps for the JEGM. Next, we examine the corelation between not only geomorphologic units but also geographical information derived from the JEGM and the AVS30 values. The AVS30s show some dependency with elevations, slope angles, and distances from mountains or hils. In order to develop the estimating model of the AVS30, multivariate regresion analysis is conducted using these geomorphologic indices. Then, we can achieve to create an AVS30 map with relatively high accuracy for al of Japan using the JEGM.
