The result suggests that 5th seismic active period of NE China will be over in about 2008,and that the maximal earthquake intensity is about magnitude 6 in this active period.

We use the set of 14 factors including seismicity and the precursors in the fixed points to establish the comprehensive evaluation matrix and the evaluation model of comprehensive prediction of seismic magnitude and apply them to earthquake prediction in Tianjin and its neighboring areas.

In this paper, a ten-year-standard seismic magnitude is estimated by using seismic risk analysis method, and the countermeasures of reducing seismic disaster are given according to the estimation result and the features of the Huoshan area.

The influence of parameters, including the damping ratio and ductility factor of SDOF systems and the intensity of ground motions, on the input energy spectrum is investigated.