Research On Spatial Correlation Model At China Seismic Experimental Site

The spatial correlation model of ground motion parameters can be used to effectively carry out regional seismic field estimation,and can also be used to accurately assess regional seismic risk in the future.The spatial correlation models proposed by international scholars generally do not include Chinese Mainland,so it is necessary to carry out spatial correlation analysis of ground motion parameters in China.With the comprehensive construction of the China Earthquake Science Laboratory,the densely arranged stations have greatly improved the observation capacity of the original digital strong motion network,providing a good opportunity to study the spatial correlation model of ground motion parameters in China.In this paper,the spatial correlation characteristics of some main shock and aftershock sequences recorded at the China Seismological Science Laboratory are analyzed.The main content of the paper are as follows:1.Based on 1266 ground motion records of five main earthquakes in the China Earthquake Science Experimental Field,the semi-variogram method of geostatistics is used to carry out autocorrelation and cross-correlation analyses of the autocorrelation exponential attenuation model and the cross-correlation synergistic regionalization linear model are given respectively.The results indicate apparent similarities in the spatial correlation of ground motion parameters in the region,and there is a similarity between the autocorrelation and cross-correlation models.2.Based on 1672 earthquake motion records of 80 aftershocks from the China Seismic Experimental Site,autocorrelation analysis was performed using the definition of the correlation coefficient and its correlation function,and the correlation index attenuation model was also provided.The results show that although the spatial correlation model of the aftershock sequence fluctuates with the main shock,it is generally similar and closely fits its own primary shock correlation model.3.Establish spatial correlation models of seismic motion for China Earthquake Science Experimental Site based on different seismic motion prediction equations and compare them with each other.The public spatial correlation model of the ground motion of China Earthquake Science Laboratory is used to compare with different results at home and abroad.The spatial correlation model of Turkey’s earthquake is obtained based on 608 ground motion records of two earthquakes of Turkey’s National Disaster and Emergency Management Bureau.The results show that the spatial correlation of China’s earthquake science experimental sites is significant,and the spatial correlation results are not affected by the earthquake motion prediction equation.