Another hypothesis holds that rock fractures and pressures between rocks generate electric currents that give rise to powerful electric and magnetic fields and large electromagnetic waves. When these waves reach the ionosphere, they cause rapid heating and expansion of the ionospheric plasma, reducing the density of particles in the ionosphere.
這些正電洞會浮流至地表，產生垂直向上的電場，進而影響電離層中的電漿濃度。另一種假設是當岩石破裂擠壓會伴生電流，而引發強大的電場、磁場和電磁波；當這些電磁波輻射進電離層後，會使得電離層中的電漿溫度急速升高、膨脹而導致電漿粒子減少、濃度降低。