Author(s)

Masashi Hayakawa^1,2, Tomokazu Asano¹, Alexander Schekotov³, Hiroyuki Yamauchi⁴

¹Hayakawa Institute of Seismo Electromagnetics, Co. Ltd., University of Electro-Communications (UEC) Incubation Center, Chofu, Japan.
²Advanced Wireless & Communications Research Center, UEC, Chofu, Japan.
³Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia.
⁴Department of Human and Animal-Plant Relationships, Azabu University, Sagamihara, Japan.

A statistical study on the basis of one-year data of 2014 has been performed in order to find whether abnormal animal behavior is related with seismic activity and also whether the ULF (Ultra Low Frequency) electromagnetic radiation might be a possible sensory mechanism of abnormal animal behavior. Abnormal animal behavior has been studied with the use of digitally recorded milk yield of cows at Ibaraki Prefecture Livestock Station, and the ULF magnetic field changes have been studied with the data at a magnetic observatory of Kakioka. As the result of correlation analyses, clear responses are observed for both the milk yield of cows and ULF magnetic field changes (both ULF radiation (ULF emissions from the lithosphere) and ULF depression (as an indicator of lower ionospheric perturbations)) for most powerful and not distant earthquakes (EQs) with magnitude > 6, that is, the milk yield of cows is found to exhibit a conspicuous depletion about 17 - 18 days before an EQ, though the correlation coefficient is not so big. Another important objective in this paper is to identify that ULF radiation is the main agent of abnormal behavior so that we have compared the temporal evolutions of milk yield of cows, ULF radiation and ULF depression for three major EQs. As a result, it is found that ULF radiation happens, at least, during the periods of abnormal depletion of milk yield of cows.

Milk Yield of Cows, Correlation Analyses, Earthquake Prediction, ULF Radiation, ULF Depression

Hayakawa, M. , Asano, T. , Schekotov, A. and Yamauchi, H. (2016) A Study on the Correlation of Milk Yield of Cows with Seismicity and ULF Magnetic Field Variations. Open Journal of Earthquake Research, 5, 206-218. doi: 10.4236/ojer.2016.54017.