Measurements in an underground quarry reveal medium-wave signals propagating with a depth-dependent vertical magnetic field component, indicating a subground wave structure not explained by conventional Zenneck-Sommerfeld models.
(2016), The chemical compositions of Shakudani Ishi and Green Tuff in Fukui Prefecture, Central Japan, Bulletin of the Fukui City Museum of Natural History, 63, 17–26
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Subsurface Propagation Characteristics of Medium-Wave Electromagnetic Fields Revealed by Measurements in the Nanatsuo-guchi Quarry: Conceptual Framework of the Subground Wave and the Rainfall Model
Measurements in an underground quarry reveal medium-wave signals propagating with a depth-dependent vertical magnetic field component, indicating a subground wave structure not explained by conventional Zenneck-Sommerfeld models.