An Application of the Co-seismic Displacement Intensity Method to the Heze 5.9 Earthquake

In this paper,the crust velocity model of Shandong was selected and Shandong virtual station's Green's function database was established.The surface co-seismic displacement around the earthquake zone was calculated using the Heze 5.9 earthquake source parameters,based on the earthquake time,location,magnitude,fault strike,dip,and slip.At first,a generalized empirical relationship between the co-seismic displacement and earthquake intensity is established and then the intensity distribution of the strong earthquake zone is quickly obtained.By comparing with the Heze5.9 earthquake macroseismic intensity data,it is seen that the co-seismic displacement intensity is similar to it.These data have a very important guiding role in the early warning of strong earthquakes,rapid disaster assessment after the earthquake,and guiding emergency rescue.Quick reporting of seismic intensity especially big earthquake intensity data can provide a new earthquake monitoring technology and a new means of reducing earthquake related disasters.Within a few minutes after a devastating earthquake,a quick determination of the spatial distribution of the seismic intensity is required which estimates the extent of damage in different regions and enables the government to carry out emergency rescue and relief operations.Then rescue workers can timely and accurately reach the epicenter area,search and rescue,thereby reducing loss of life and property.Currently,many earthquake-prone countries and regions have paid more attention to quick reports of earthquake intensities which have been widely used.An earthquake structure is very complex,but for most earthquakes,it may be approximately inferred that they are caused by sudden dislocations along fault planes.Calculation of the co-seismic displacement field was considered to change over a very short time scale and mainly included elastic dislocation effects which were simulated ground motion changes at the time of occurrence of the earthquake.Through this change we can approximate the extent of the earthquake damage.Intensity and co-seismic displacements have a direct relationship in strong earthquake zones.Therefore,we can use the co-seismic displacement intensity to approximate the seismic intensity.Through comparisons and global experiments on several earthquakes,the strong earthquake zone was found to have a significant effect.Although this theoretical calculation had some errors that need to be corrected using follow-up information,this method does not depend on the distribution of stations.They play a very important guiding role in giving early warnings of big earthquakes,particularly in regions that have less number of stations.Based on the Shandong velocity model,this paper established the Shandong virtual station' s Green's function database and the co-seismic displacement theory was applied to the Heze 5.9 earthquake to validate that application of the method was also possible for the Shandong moderately strong earthquake epicenter area.