Abstract
Various natural disasters occur in Japan, including avalanches, earthquakes, and volcanic eruptions. Thus, a novel rescue system that can quickly search for survivors after a disaster is necessary. Although wireless systems are suitable for this purpose, the optimal frequency for achieving low-attenuation communication must be determined. In this study, the transmission characteristics of sub-THz waves in Sakurajima and Shinmoedake volcanic ashes were measured. The results showed that the optimum frequency was different for each volcanic ash sample. The specific transmittance in the case of Sakurajima and Shinmoedake is 90.3% at 47.6 GHz and 85.9% at 93.4 GHz, respectively.
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