Researching into the relations of the intensity against the external agencies of microscopic scales-rill erosions, frost erosions, etc.-with the own textures of the volcanic ash deposits, the author reached a conclusion as follows:
(The intensity of the volcanic ash deposits were considered according to the values measured with a pocket penetrometer.)
1) On the intensities (or penetration resistances) of the volcanic aSh deposits, the homogeneous ones are more intense than the granular ones.
2) On their specific resistances, the measured values of the homogeneousones are higher than the granular ones.
3) After the facts reduced from 1) and 2), where the horizons of volcanic ash deposits with granular textures are exposed just on the earth surface, the earth erosions advance rapidly and a great mass of volcanic ashes loses and removes.