The generation of the magnetic signals at LF band may be caused by the emission of electrons from the breaking crystals in the rocks, whereas that of ULF band by the piezomagnetic effect.
微破裂可能产生了偶电层，在破裂过程中向外辐射，产生了LF频段的磁信号，UL F磁信号则主要由压磁效应产生。
The generation of the magnetic signals at LF band may be caused by the emission of electrons from the breaking crystals in the rocks, whereas that of ULF band by the piezomagnetic effect.
微破裂可能产生了偶电层，在破裂过程中向外辐射，产生了LF频段的磁信号，UL F磁信号则主要由压磁效应产生。
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