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 Asahi-Cho is about 3.7 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.