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Existing seismic intensity scale Ⅴ degrees above horizontal ground motion peak acceleration and peak speed of two physical parameters and seismic intensity reference relationship. When the PGA and PGV calculated instrument intensity, the calculated results and field investigation intensity match rate is very low. How to calculate the intensity rapid assessment instrument intensity, is a problem worthy of study, this paper, the problem of the following studies: (1) of this article select Wenchuan M8.0 earthquake VI to IX degree region of the 88 stations of the acceleration record speed records, and statistics stations PGA, PGV simulation method. PGA and PGV, respectively instrument intensity calculation results show: two methods to assess the results and on-site survey intensity match rate is very low. (2) calculation of the ground vibration peak ground acceleration (PGA), the peak velocity PGV has a similar 90% energy holding Td ten ground motion parameters. Ground motion parameters involved in the intensity assessment, this paper calculated the correlation coefficient between these parameters, these parameters can be divided into three groups by analysis of the correlation coefficient, in order to find a representative in the case consider the convenience of the application, the paper in each group in the initial choice of the physical parameters of the PGA, PGV and Td assessed as participation in intensity. The relationship between the three seismic intensity fitting, fitting results show good correlation between: PGA and PGV seismic intensity, variance, Td and poor correlation of seismic intensity, so this paper to select PGA and PGV two parameters, as the assessment of seismic intensity physical standards. China Earthquake Intensity, both individually assessed separately given station at the intensity value, calculated both instruments intensity compared with the on-site investigation macroseismic intensity, match rates were 35% and 50%, significantly lower than the PGA calculations PGV calculations, but they match the lower rate, and solve this problem through the analysis of the assessment results, the paper proposes a weighting scheme based on the consistent rate, with the PGA and PGV comprehensive assessment of intensity assessment results show that, the match rate has improved greatly, indicating that the proposed method can be an effective instrument intensity closer macroseismic intensity. (3) of this article learn Japanese instrument intensity calculation method, derived an instrument intensity standard is broadly in line with our current seismic intensity assessment standards, inspection and Wenchuan earthquake records. The research shows that: PGA, PGV comprehensive judgment method and the intensity value of the station at the standard assessment and site survey results match rate in more than 60%, the same time, we also carried out with the Chi-Chi earthquake information checking, research shows : PGA separate assessment results are significantly better at other ways to assess the results. PGA, PGV comprehensive judgment method is simple, more comprehensive considerations Japanese instrument intensity calculation method, the stability of the assessment results are better, generally speaking, the result of the Japanese Instrument intensity calculation method is more stable, in the proposed method further Prior to the study, this study suggests that Japanese instrument intensity calculation method instrument intensity. Finally, the authors summarize the work of the full text, and discussed the need for further research work.
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