Ka kammala wannan magana: Nazarin kwanan nan guda biyu da Konstantinos Eftaxias da abokan aikinsa suka yi sun bincika filin ULF na magnetic kafin manyan girgizar ƙasa. A cikin
A girgizar kasa ta Tohoku ta 2011, hasken ULF ya nuna halayyar mahimmanci, yayin da a girgizar kasa ta Sichuan ta 2008, masu binciken sun sami raguwar filin magnetic na ULF na kwance, wanda kuma za'a iya fassara shi azaman bayyanar mahimmanci.