Observation of ULF Geomagnetic Variations and Detection of ULF Emissions Associated with Earthquakes: Review

Abstract

Earthquake- related electromagnetic phenomena are recently considered as a promising candidate for short-term earthquake prediction. There have been accumulated a lot of evidences of precursory signatures in a wide frequency range (DC-VHF), but the ULF geomagnetic change is one of the most promising phenomena. We review our latest results on seismogenic ULF emissions; characteristics of those emissions and methodologies to detect abnormal changes in ULF electromagnetic field associated with earthquakes.