Jiuxi basin is located in the northeastern margin of Qinghai-Tibet plateau with active natural earthquake.

The tectonic domains with active crustal movement may include circum-Pacific tectonic zone,oceanic ridge tectonic zone and northern continental tectonic zone nowadays,in which there exist active natural earthquakes,re-movement of deep faults.

The correlation between rockburst and the regional natural earthquake has been analyzed;and it is found that the occurrence time of natural earthquake lags behind that of rockburst.

Hydrocarbon in generation,migration,accumulation and dispersion and earthquake generate or occur in upper part of the crust,there exists consequence between them.

Earthquake forms when crust under the stress is damaged promptly.

According to seismic, regional earthquake and geological data, the paper discusses the main types of geohazards (faults, earthquakes, seafloor slip and sea floor topographial obstacles), activities, distribution and causes of these geohazards.

Study on the prediction of relatively strong aftershocks in earthquake sequence with least square fitting method;

The type of earthquake sequence and distribution characteristics in Ma anshan city and surroundings;

A review and discussion on earthquake sequence research;

In this paper the possibility and the specific method of CORA-3 pattern recognition algorithm are explored for the early synthetic judgement of seismic sequences of strong aftershocks,strong swarms and foreshock-mainshock-aftershock.

The Q-value studies are not only studied by the natural seismic wave, but also in the laboratory, where the attenuation theory of seismic wave and observing method of measuring Q-value are studied.