Abstract
(1) The conspicuous fault topographies, as terminal facets, kernbuts and kerncols, Hara topography were observed on the eastern foots of the Mt. Nan. sho, Azumane and Uwandaira as shown in Fig. 1., 2 and 3.
(2) The geologic evidences related to these fault were found at the locations 1_??_12 in Fig. 1, 4, 5. The fault planes generally dip to the west. The Mt. Kuromnori fault and Mt. Nansho fault seem to be high angle reverse faults.
(3) The age of the faulting are classified in two periods: the one may be Post-Shiwa bed (pleistocene), and the other Pre-Shiwa bed. The Mt. Nansho, Mt. Uwandaira and Mt. Kusai faults belong to the former, and Mt. Kuromori fault to the latter.
In brief, the Morioka fault group played an important role in the formation of the Kitakami basin, and its movement took placed in recent age.
