Ground investigation service "Liquefaction Survey"

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last updated：Aug 28, 2026

ジオテック

We have prepared a four-stage method ranging from a preliminary assessment based on data to a detailed assessment involving boring investigations.

Liquefaction surveys (liquefaction assessments) are investigations that determine the potential for liquefaction during an earthquake based on ground and water level conditions. By understanding whether the site is prone to liquefaction and implementing appropriate liquefaction countermeasures, damage can be minimized. GeoTech Co., Ltd. offers four levels of methods, ranging from preliminary assessments based on documentation to detailed assessments involving boring surveys. 【Features of GeoTech】 ○ Experienced analysis staff (3 certified geological survey technicians) ○ Many employees hold qualifications as residential ground technicians and chief technicians from the NPO Housing Ground Quality Association ○ Ground consulting before and after the survey ○ Achievements in ground surveys and ground reinforcement work in the metropolitan area are compiled in the Ground Information Provision System (GEODAS), improving diagnostic accuracy through database creation and comparison with neighboring data ○ Courteous service to clients For more details, please contact us or download the catalog.

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**Liquefaction Survey Product Types** ○ Overview liquefaction assessment of residential land based on document research → Mainly targeting surveys of two-story wooden residential land → Rough assessment of liquefaction potential based on topographic maps, liquefaction maps (hazard maps) created by public organizations, and liquefaction history maps ○ Liquefaction assessment of residential land using Swedish sounding tests → Mainly targeting surveys of residential land up to three-story wooden structures → Conducting a simple assessment of the ground based on the results of Swedish sounding tests and groundwater levels, along with microtopography classification ○ Liquefaction assessment of residential land through soil quality surveys → Mainly targeting surveys of residential land up to three-story wooden structures → A more precise survey method that incorporates soil grain size test results in addition to liquefaction assessment based on Swedish sounding test results ○ Detailed liquefaction assessment (according to building foundation structural design guidelines) → Calculating FL values and PL values from boring surveys, standard penetration tests, and soil quality tests to determine the liquefaction potential of each soil layer and the overall degree of liquefaction of the ground ● For more details, please contact us or download the catalog.