| Strong-motion observation records provide important basic information for the development of earthquake engineering.The Chinese digital strong-motion station network has acquired more than 40,000 strong-motion observation records from 2007 to the end of 2022,which provides valuable data for analyzing strong-motion records.This paper systematically composes the historical digital strong-motion records and investigates the ground-motion characteristics,instrumental seismic intensity conversion relationship and attenuation relationship,P-band ground-motion parameters in relation to magnitude and ground-motion intensity estimation,expecting to provide support for the strong-motion needs of the P-band ground-motion parameter conversion relations,expecting to provide support for earthquake engineering community needs.(1)In this paper,after systematically organizing and improving the digital strong-motion observation records in China,the ground-motion characteristics of the strong-motion observation records in China are analyzed with reference to the attenuation relationships at home and abroad.The results show that the peak acceleration,peak velocity,and acceleration response spectrum of 5%damping ratio of ground shaking in China are generally smaller than those of BSSA14 model,and the magnitude,distance,and site conditions are the influencing factors for the differences,which have different effects on the peak acceleration,peak velocity,low period acceleration response spectrum,and medium and long period acceleration response spectrum;the spectral mean value of acceleration response spectrum of 5%damping ratio in China The peak period is around 0.15s;the correlation between the 95%significant holding time of ground shaking in China and the established attenuation relationship is good,and its changes with the magnitude,distance and site are more similar to the global results,and there are some differences with the United States;there are a large number of observations of Arias intensity and cumulative absolute velocity of ground shaking in China are higher than the attenuation relationship abroad.(2)In this paper,we applied a large number of observed records of strong shaking for earthquakes of magnitude 4 or higher in China and Japan,calculated the instrumental seismic intensity and related ground shaking parameters in China,the United States,and Japan,compared and analyzed the instrumental seismic intensity calculation methods,obtained the statistical relationships among related ground shaking parameters,and gave the empirical conversion relationships among the three instrumental seismic intensities.The correlation between the Chinese and Japanese instrumental seismic intensity intensities is good,and the Chinese instrumental seismic intensity is about 1.562 that of Japan;the U.S.instrumental seismic intensity is not smooth in the high and low intensity regions because of the calculation method.In this paper,we also selected the strong shaking observation records in Sichuan and Yunnan to establish the instrumental seismic intensity attenuation relationship considering the magnitude,propagation path,site effect and fault type in the region.There are some differences between the instrumental seismic intensity attenuation relations and the traditional macroscopic seismic intensity attenuation relations,and the instrumental seismic intensity attenuation relations given in this paper are more consistent with the instrumental seismic intensity of the strong-motion observation records in China by companson.(3)This paper establishes the conversion relationship between P-wave amplitude parameters and magnitude using the Chinese strong-motion observation records,and the study shows that the P-wave peak displacement estimates the magnitude best with a standard deviation of 0.5 magnitude units.The S-wave amplitude in the horizontal direction is about 5 times that of the P-wave,which is closer to the empirical solution of the S-wave to P-wave amplitude ratio of 5 for the dual-force couple point source model,but the S-wave amplitude in the vertical direction is significantly smaller than that of the P-wave by a factor of 5.In addition,the estimated relationships between the P-wave amplitude parameters and peak velocity,instrumental seismic intensity,Arias intensity and cumulative absolute velocity are also established in this paper. |
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