How to interpret these values
Landform describes regional terrain, not the safety of an individual plot. Terraces are generally higher than surrounding lowlands; valleys and lowlands can collect water. Check local depressions, fill, drainage and official flood maps separately.
The sampled elevation range around Taishacho is about 11.6 m. Absolute elevation alone does not determine flood risk. Slopes may affect access, retaining walls and rainwater flow.
AVS30 indicates average ground stiffness to 30 m depth. A larger value generally indicates stiffer ground. An amplification factor above 1 indicates estimated amplification of shaking, not a building’s seismic performance or a requirement for ground improvement.
Check disclosure documents, current municipal hazard maps and plot-specific ground investigations. Conditions can vary within the same neighborhood.
