soft ground; weak ground
Technical term in civil engineering and construction, referring to ground with low bearing capacity or high compressibility, such as peat, clay, or loose sand.
Building on soft ground requires ground improvement.
この地域は軟弱地盤が多いため、地震の際に液状化のリスクが高い。
Because this area has a lot of soft ground, the risk of liquefaction during an earthquake is high.