DEVELOPMENT OF EVALUATION PROCEDURE OF THE VOLCANIC DISASTERS

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In order to develop the method of evaluation of the nature and extent of the damages done by the volcanic eruptions, with close combination of the civic geographic information and the hazard map of volcanic disasters, an endeavor was made to create a computerized system which will deal with numerical simulation of the mode of emplacement of pyroclastic fall and flow deposits.1. Numerical simulation of pyroclastic falls and flows were performed to give maps depicting arrival time, grain size, and isopach maps.2. Digitized civic information data such as geographic boundaries, population and industrial distribution are processed to combine the natural disaster and risk maps including hazard maps to produce assessment maps of the physical and man-power risks and expected damages of the region.3. Attempts were made to improve the mode of presentation of such results, especially in graphic format, in order to help understanding by the experts of civil defense who are not experts of volcanology.4. Numerical simulation of the particular cases of an imaginary volcanic eruption of Asama volcano on lava flows and pyroclastic flows. The eruptive phenomena were assumed of the same order of magnitude as that occurred in the 1783 eruption of the same volcano. Feed backs were made to improve the models and method of calculation.Final report was edited and printed with the emphasis on the general use by the non-volcanologist civil defense officers and the general public.