As a test of the quantitative method, the relation between the height and area in the every zoom contour of volcanoes was studied. This “sectionless” method (no sections made of the volcanoes) has both advantages and dis-advantages. The area increase every 100m is also calculated in order to explain the hypsographic curve (shown by a broken line in figure). Since below a certain height, other mountains beside the volcano may be cut by the same contour lines, by critical height (in the figure chain lines) is meant that height below which mountains other than the volcano are not considered.
First, three volcanoes are selected (1, 2, 3 in Fig. 12), namely, one with cone almost a logarithmic curve or hyperbola, a lava dome with straight lines, and a shield shaped volcano with a flat curve. The curves are classified by their apparent shape based on knowledge of their geology and topography.
1 The dome type: Mt. Hutago (2 in Fig. 12), Mt. Miyatuka of Niizima island (2).
2 The shield type: Mt. Gassan (1), Mt. Hakkoda (10), Mt. Hanna (13 & Fig. 6)
3 The confide type: a. Dome with wide Susono (surrounding skirt) Mt. Sanbe (7 & Fig. 3), Mt. Daisen (6), Mt. Oakan (12 & Fig. 5) (somewhat different type)
b. Flat type: 1st. example, with very. wide skirt contracting wide skirt contracting to a steep or small top (lava domes and eroded conides), Mt. Akagi (Fig. 12, 14), 2nd. example with caldera, Idu Oosima (island) (16)
c. Type intermediate between b and d: Miyake island (15 & Fig. 8), Mt. Asama (17), Mt. Iwate (18 & Fig. 9), Mt. Tyôkai (Fig. 24), Mt. Yatugatake (22) (only its southern part).
d. Huzi type: logarithmic curve: Mt. Siribesi Mt. Huzi, Mt. Iwaki (26), Mt. Komagatake in Hokkiadô (27), Mt. Bandai. (11).
e. With a small skirt: Mt. Kaimon (1), Mt. Komagatake in Hakone (2). Mt. Turumi (21), Mt. Nantai (20).
Finally the effects of erosion or disintegration on the hypsographic curve are summarized from a number of examples, such as the hypsographic curve moving to the left, causing steepness, and the increasicg curve causing irregularities in these.

抄録全体を表示