Reverse tracing of precursors and earthquake precursors in eastern Taiwan region;

The history and future of the abnormal animal behaviors used as earthquake precursor;

Research and practice in deep borehole comprehensive observation of earthquake precursors;

Based on the mutation behavior of the complex variation process of Earth system,this paper analyzed some basic issues on earthquake precursors.

The paper mainly includes three parts: anomaly statistics of earthquake precursors for large earthquakes in China and observed item surround capital area, discussion of anomaly in Heilongjiang province, some ideas on identifying earthquake precursor.

The mechanism of many earthquake precursors is related to fluids deep inside the Earth.

The seismic precursor abnormal information extraction of tilt solid tide usually based on the distortion,tendency,elevation,fall,break and so on characteristics of solid tide.

At first,the environment of seismic precursor occurrence,the relations betwen subsurface fluid action or subsurface fluid force and seismic precursor are analysed.

This paper briefly states the requirements of observation site of seismic precursor,and introduces how Fujian Digital Seismic Precursor Station Net (abbr.

The relation between the gravitational field and the seismicity in coast area of South China has been discussed, and the earthquake precursory information for the time-space and strength changes of the gravity field in Guangdong area have been picked to provide the criteri.