On new statistical technologies of quantitative seismic information mining from electromagnetic satellite data

The pattern information (PI) method was reasonably modified and firstly introduced to the observation data processing of electromagnetic satellite in this paper. Taking the moderate-strong earthquakes as examples, the IAP data recorded by the France DEMETER electromagnetic satellite were systematically processed with the modified PI method. We can find that the variation in non-seismic regions and at non-seismic periods are not obvious and have almost no useful information, but the abnormal variations of IAP parameters in the ionosphere with regularity and significance appeared before moderate-strong earthquakes, which shows that the electromagnetic satellite may observe precursory abnormal variation before some moderate-strong earthquakes. Only the slight variation were submerged in a strong background trends, and high-resolution methods are necessary to effectively identify and deeply excavate this information. What´s more, we proved that the modified PI method with integration capabilities of long trends and short variations effectively eliminated the background trends of electromagnetic satellite data and also highlighted good short-term variations. Therefore, it is thought that the modified PI method to IAP data processing is effective and itself specific modification measurements are also feasible, reasonable and successful.