14 巻 (1972) 1 号 p. 1-8
The movement of landslide masses is widely different from rapid to very slow. The masses, once born, then develop through several steps, and finally die. Different types of moisture exist in the ground of landslide area. The features and movements of the moisture vary with the growth of landslide.
These characters of the moisture are to be discussed hereafter. In the present report, characters of landslide phenomenon is generally described, the moisture is classified into several types and the flow in large voids and wide cracks caused dy landslide movement (one of the above types) is discussed.