The Volcano Kirigamine, which rises about 1900m northeast of the Suwa basin along the Fossa Magna in Central Japan, is a fragment of a diluvial shield volcano about 4km in width and 10km in meridional directiom and the surface declines southward. Its periphery being encroached by valley erosion and changed into the maturely dissected surrounding mountains, which also consist of volcanic rocks. The western half is covered by the youngest glassy lava and cut by shallow consequent valleys. The dissection on the eastern half is more advanced. The surface of this fragment of shield volcano cut in its middle part by an ENE-WSW fault. On the western half, the shallow valleys which, runniug cross the fault, interlock each other, while the spurs on the eastern half are detached in kernbuts through faulting (Phot. 1 & 2). It will be seen from this shifted morphology that the northern part of the fault moved eastward about 400m along the fault. Although the southern side has slightly upheaved against the northern, the amount is very small compared with the horizontal displacement.
It is noteworthy that, as in the Yugawara volcano, the fault intersects obliquely the Suwa Graben and that the horizontal displacement exceeds in amount the vertical.