Research On The Earthquake Dynamic Seismograms Technology

Seismograms is an efficient way to understand the disaster after an earthquake,calculating the ground motion information monitored by stations to get the distribution of parameter quickly.Compared with the traditional method,seismograms needs less resources and will not be influenced by subjective factor.The most important is,the details of the earthquake ground motions will be given after the earthquake occurred in a very short time(in minutes).Considering the present situation of the monitoring stations will gradually encryption and learning the seismograms production methods at home and abroad,the author proposes a new real-time method based on dense stations.This method make the utmost of advantages of dense stations to draw real-time shake map without three essential of earthquake motions.The products include real-time seismograms of PGA,PGV,energy parameters and intensity of stations and area.It not only can reflect the whole process of seismic event factually but also provide the parameters of the regional distribution.In this way,can get more precious time for emergency rescue.The main achievements of this study have been summarized as follows:1.The real-time calculation method of the ground motion parameter.This paper involves four parameters: PGA,PGV,energy parameter E and intensity I.Calculating parameters per second in different way: PGA,PGV,using three points to the synthesis of acceleration,velocity;energy parameters E,by means of the integral of velocity record in time;intensity I,according to the new “Code of practice for instrumental seismic intensity”.2.The research on seismograms of parameters of stations and area.Confirm parameters meet the attenuation law of time and space first,by means of the envelope of parameters;then calculate four parameters per second and get the seismograms for per second.Updated these figures over time,then we get real-time seismograms of stations.This article provides the accumulation status of original time to current time by cumulative calculation.Then have a more intuitive understanding to the degree of the eventual impact of the earthquake event.Based on the process,the author introduces the interpolation method used by FJEA based on sparse stations.Because this article is based on dense stations and stations situations can represent the ground motions of a certain area,therefore,this paper chooses a simpler near interpolation calculation method to get the shake map.And then,apply this process to specific examples and introduce the function of graphic productions simply.3.Determining the start time of earthquake events by the change of energy parameter.The occurrence process of an earthquake event is also a process of energy release.The author came to the energy variation range before and after the seismic by the analysis based on a certain amount of events.And is verified by the practical earthquake examples,the result show that the method is feasible.In the end,the author summarizes the work in this paper,and discusses the work that still need to study.