Time lapse survey

Changes in underground resistivity usually result from variations in groundwater conductivity and soil water content. The time lapse resistivity survey method observes these variations and can help operators monitor abnormal underground or structural behaviour.

Time lapse resistivity/IP survey is therefore useful in dam and tunnel safety monitoring.

ZZ is currently developing remote-monitoring systems, which will detect the rate-of-change for these conditions in order to serve as an early warning system.