afree87 (102803) writes "A new paper submitted to arXiv uses satellite data to contend that the ionosphere heats up before earthquakes. Observations from the DEMETER spacecraft show heat rising from the Pacific Ocean off Japan, spiking three days before the earthquake. "The thinking is that in the days before an earthquake, the great stresses in a fault as it is about to give cause the releases large amounts of radon."" Link to Original Source
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