Study on Typical Characteristics of Short-Term Precursors in Underground Fluid

摘要

The underground fluid short-term anomalies of earthquake activity are studied. Two kinds of typical characteristics of precursors, the turn-around type and the single type, are summarized. Through studying regional characteristics of earthquake precursors in North China (including Northwest China) and Southwest China, we find that the two types of precursors are strongly related to geological structures in regional distribution and they show varying characteristics with earthquake magnitude in number.