Two recent studies by Konstantinos Eftaxias and his colleagues examined ULF magnetic fields preceding major earthquakes . At the 2011 Tohoku earthquake , ULF radiation exhibited critical behavior , while at the 2008 Sichuan earthquake , the researchers found a depression of the horizontal ULF magnetic field , which may also be interpreted as a manifestation of criticality
2011 Tohoku earthquake
2011 Tōhoku earthquake and tsunami
Seismo-electromagnetics