Seismic Hazard Analysis Based On Ground Motion Parameters And Gridding Engineering Site

China is one of the countries with frequent earthquake disasters,and the earthquake occurs frequently and widely,which not only causes serious casualties,but also causes incalculable economic losses.Therefore,from the point of view of the safety of all mankind,it is very important to study and analyze the seismic risk in the area of frequent earthquakes.At present,the seismic hazard analysis methods mainly include deterministic seismic hazard research methods and probabilistic seismic hazard analysis methods.this study is based on the deterministic method,combined with the engineering site grid division,according to the distribution of seismic influence parameters(epicenter distance,peak acceleration,peak velocity)in the study area,the degree of seismic hazard in the study area is evaluated.The risk analysis method of seismic linkage(which occurs simultaneously in adjacent regions)is proposed.According to the distribution of the influence parameters of seismic linkage in the study area,the risk of seismic linkage in the study area is evaluated.Based on the method study,the seismic hazard degree of the region was evaluated in Chengdu as an example.The index of seismic hazard assessment in Chengdu is given reasonably.The main tasks are as follows:(1)The grid element is divided into 1 km×1 km distance in Chengdu,and the grid element is taken as the research object to evaluate the risk of the grid element.Based on the new generation of ground motion attenuation relation,the calculation method of ground motion attenuation relation is summarized.Based on the mathematical calculation software,the seismic influence parameter values of the study area are calculated and the distribution map of the earthquake influence degree in Chengdu is obtained.(2)Without considering the frequency of earthquake occurrence and considering the frequency of earthquake occurrence,the seismic hazard of Chengdu is analyzed according to the distribution map of influence degree.(3)Considering the influence of the simultaneous occurrence of earthquakes in adjacent regions on the study area,the risk analysis method of seismic linkage is proposed.Based on the risk analysis method of seismic linkage,the risk of seismic linkage in Chengdu is discussed by using the influence parameters of seismic linkage,epicenter distance,peak acceleration and peak velocity.The results show that:(1)In seismic hazard analysis,the seismic influence trend of epicenter distance,peak acceleration and peak velocity on Chengdu is mainly reduced from north,northwest,southwest to central,eastern and southeast of Chengdu.Its northern and northwest region earthquake impact is the most serious,the eastern earthquake impact is the least.(2)By comparing the influence of each seismic belt in Sichuan Province on Chengdu,Longmen Mountain seismic belt has the greatest influence on Chengdu,and its maximum seismic peak acceleration value is 2.219 g Famous mountain-Mabian-Zhaotong seismic belt has the least impact on Chengdu,its largest peak acceleration of ground motion 0 g,almost no impact on Chengdu.(3)In the seismic linkage risk analysis,the influence trend of epicenter distance,peak acceleration and peak velocity on the seismic linkage of Chengdu is mainly reduced from the north,northwest,southwest to the central,eastern and southeast regions of Chengdu.(4)The peak acceleration and peak velocity decrease with the increase of epicenter distance.Therefore,in an earthquake of equal scale,the smaller the epicenter distance,the more serious the earthquake damage.Conversely,with the increase of epicenter distance,the damage caused by the earthquake gradually decreases.This study will accurately analyze and evaluate the earthquake risk in Chengdu,which not only has a certain application value to reduce the earthquake disaster loss,but also can provide guidance for seismic risk analysis in other regions.