Abstract
This report shows the several findings of our investigation of the crystalline schist landslide in Shikoku. The observations of extensometers and internal strainmeters make it clear that the movement of the earth's. surface and underground has both expansion and contraction. The movement has an annual variation and a monthly variation. The drainage of four drainpipes is a few liter per minute, but the activity of a landslide declines remarkably.
