The materials of the landcreep is formed by the products of rock disintegration and decomposition, they have very low seismic velocity, such as soils or unconsolidated sandy gravels, and deposit irregularly on the bed rocks. Therefore, Hagedoornis plus-minus method is the useful interpretation technics for landcreep survey with the seismic sounding.

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There are 64 springs in this area and they are found in following geologic members: Daisen'tuff-breccia, Nagata pumice bed, Nisiobara tuff-breccia of Daisen pyroclastic group, Tataradoyama andesite, Habeyama andesite, Tubogameyama andesite of Daisen andesite group and alluvium.
For attempt to quantitative consideration about spring resource, trial calculations of discharge of spring are computed, and results are as follows:
1) Discharge averages of spring in each geologic members belong to 4 class (discharge 1x10²-1x10^1' l/sec).
2) Apparent unit area discharges of spring in several geologic members are 10³-10⁴ M³/day/KM². Moreover apparent unit area discharge of spring is ratio total discharge of springs in same geologic member to total area of that member.
3) Both discharge average and apparent unit area discharge ranks following order: Spring in Tubogameyama andesite Spring in Nabeyama andesite Spring in Tataradoyama andesite.
From above results, the writer conjectures that spring resource in Daisen andesite group is prominent quantitatively than in Daisen pyroclastic group.

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The selection of building site is the most important work for engineer in stage of planning. Resently many failures of building site occur at the foot of mountain and hill region.
Most of them seem to be coused by inadequate condition of the site. When we select the building site, we usually examine rather empirically several factors such as geological topographical hydrological and soil condition.
The project being comparatively small and limited, engineer is able to analize stable condition by appling of soil mechanics principle. But the area conserved having great extention and variety, we must treat many factors affecting the stability of the site as geology topography soil sight view, traffic condition etc.
We have hitherto treated these factors empirically and fragmentally. Now in this paper we propose a new method to express these factors more rationally than before.
The factors treated in this paper are limited in geological topographical and soil condition and they are replaced into a standard term suitability index which is calculated by soil mechanics principle.
The suitability index being a function of soil and rock properties (c, φ) and gradient of the slope (θ) means possible maximum width of even site plane that is formed by cutting and banking of soil or rock.
Thus the factors discussed fragmentally before are comparatively synthetic expressed. This method however is not available for exact analysis of stability of relatively small and limited site because the stability of the site is affected considerably by another local minor factors.
This method therefore is valuable as a standard to determine adequate site in primary stage of site planning.

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This thesis follows the “No.1”(Vol.2, Nos. 3, 4, Dec. 1961 of this Journal) to discuss the situation of present geology referring to the future promising direction. Just as fluid mechanics and astromechanics lie on the basis of modern rocket technics, geomechanics should stand for a foundation of construction works.
Geomechanics which is not so immature compared to soilmechanics, has been rather weak in pure geology, and this situation has furnished inadequate support to construction technics.
By pushing forward the rock-and geomechanical studies on the crustal materials pure geology and construction technics will surely develop each other, and applied geology is to bridge these ends.

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