The Application Of Focal Mechanism And Aftershock Sequence In Fast Judgement Of Earthquake Emergency Intensity

China is a country with frequent earthquake,the earthquake caused huge casualties and economic losses in China. At present, earthquake prediction is still difficult to achieve, so emergency rescue work is particularly important after the earthquake.The direction of this paper is the key problems in earthquake emergency,it emphasize to solve the influence factor of fast assessment in earthquake emergency,especially seismological application to intensity determination.On the basis of earthquake intensity primary evaluation,my research make use of the correlation aftershock frequentness,aftershock energy field,centroid, focal mechanism between earthquake intensity.It proposes the method of rapid dynamic correcting of earthquake intensity to provide the reference for the earthquake emergency rescue work.Primary assenssment adopts microscopic epicenter,nearest active fault strike and isoseismals which are determined by region intensity attenuation relationship.we collect earthquakes which have the whole focal depth from 1958 to 2014 in Chinese mainland,clear up several empirical relationships of the epicenter intensity with the earthquake magnitude and the focal depth so that we could evaluate epicentral intensity.we collect 41 seismic intensity length as well as area.On account of statistical analysis,we use ellipse attenuation model to gain seismic intensity attenuation relationship in north-south seismic belt of china.They apply to general medium-small earthquake.Again violent earthquake has big rupture,fault-rupture model is more suitable. we get statistical relationship between magnitude and rupture length through 27 historical quakes whose magnitude are above 6.5 until 2013.In consideration of the near field minor asix length of fault-rupture model is usually undersize,the paper propose area-rupture length as parametric for fault-rupture model.Isoseismal shape of great earthquake approximate a track in near field and ellipse in medium deep field.So,we try to use a mixed model which includes two different attenuation relationship fitting track and ellipse region.We compare several methods in Wen Chuan earthquake,Yu Shu earthquake,Lu Shan earthquake and Min Xian Zhang Xian earthquake.We discover area-rupture length relationship improve minor axis undersize,while major axis-the rate of major sxia minor axis obvious promote goodness of fit in medium deep field.This paper indicates that isoseismal maps confirmed through the rate of major sxia minor axis that is based on ellipse model,and area-magnitude relationship that is based on fault-rupture model together could provide a useful reference work for emergrncy intensity assessment.There are usually some distances between macroscopic epicenter and microscopic epicenter.This paper is aimed to study 24 hours aftershock sequence frequentness and aftershock sequence energy field space variation of seven big earthquakes whose magnitude are above 6.5 from 1976 to 2014 in western China at predicating rupture scope and macroscopic epicenter.In aftershock frequentness,aftershock energy field,the paper utilize Wiemer’s test method for fitting effect to estimate aftershock completeness magnitude within 24 hours.Then,meshing is used to count frequentness and energy.finally,we ascertain estimation meizoseismal area and macroscopic epicenter through corresponding aftershock magnitude.The paper indicate that estimation meizoseismal area have consistency with actual severely affected area.Comparing twenty six earthquake centroids in Harvard Global CMT catalogue from 1976 to 2013 with macroscopic epicenter,we discover that centroid as the estimated epicenter narrow the distance between microscopic and macroscopic epicenter. The results of three methods obviously improve the offset of microscopic epicenter.It is profound guiding significance for emergency work.Focus fracture pattern which could affect intensity attenuation relationship. The paper through 250 earthquakes with magnitude ≥5.0 from 1931 to 2013,on the basis of regional division of tectonic stress field in china,using ellipse model,this paper fits the seismic intensity attention relationships with different focal mechanism solution. The paper preliminarily analyzes a discrepancy between seismic intensity attenuation relationships of several focal mechanism solutions,by comparing and contrast of the predecessors’ achievements and the actual results, proved that the conclusion of this paper is more in line with the actual regional intensity attenuation relationship.The result supports that earthquake rupture mode have some influences for the intensity attenuation,it will help us to more accurately estimate the seismic intensity field.