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What Happened Electromagnetically at the 1995 Hyogo-ken Nanbu (Kobe) Earthquake?

2013; American Geophysical Union; Linguagem: Inglês

10.1029/cs007p0096

2329-8553

Toshiyasu Nagao, Seiya Uyeda,

Seismology and Earthquake Studies

Occurrences of anomalous electromagnetic phenomena at varied frequency ranges, covering ELF to VHF, have been reported in relation to the 17 January, 1995 Hyogo-ken Nanbu M7.2 earthquake, by several independent research groups. Prominent preseismic peaks, which could have been emissions from the focal area, were observed on 9–10 January in ELF, VLF, LF and HF ranges. Whether these changes were truly precursory to the earthquake is not certain, because atmospheric (thunderbolt discharge) noise also peaked on 9–10 January. In the earlier few hours of the earthquake, which occurred at 05 LT46 (Japan Standard Time), 17 January, anomalous changes were markedly enhanced toward the catastrophe, in agreement with many reports on unusual radio/TV noise. Anomalous transmission of man-made electromagnetic waves in VLF and VHF ranges was also detected from a few days before the earthquake, indicating the possibility that the ionosphere above the focal zone was disturbed at the final stage of the earthquake preparation process.