Abstract
The landslide observation system has been operating at Hiramaru landslide area since 1988 . The system consists of the ground electric potential meters, the groundwater gauges, the rain gauge and the tiltmeters. The method of observation is carrying out remote sensing in Nigata city of 100km distance from Hiramaru landslide area.
As the analized results of measured the ground electric potential, three patterns have been found . They are the effect of streaming potential caused by interflow in rainy day, the effect of streaming potential caused by flow of groundwater and the complex effects of potential caused by rainfall and changes of groundwater level.
The observation of ground electric potential will be useful for the study of flow of groundwater at the landslide area.
