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Research on characteristics of mid-and short-term seismic precursors

On the basis of physical precursory segmentation, the mid and short term anomalies (one year long scale) of strong and moderately strong earthquakes are summed up in this paper. It is thought that the mid and short term anomaly of seismicity is characterized by showing mid short term quiescence (one year or so) beside the epicenter, as well as the mid short term gap. The developing process of mid term stage as a whole characterizes the mid and short term precursory anomalies of multi disciplines. Since different sized earthquakes show obvious difference to connotation of the seismogenic process in about one year or so, the mid and short term precursory characteristics of strong earthquakes (more than M S  7) and moderately strong earthquakes are studied and summarized respectively in this paper.