Research On The Characteristics Of Regional Crustal Horizontal Deformation Affected By Atmospheric Load

The horizontal movement of the crustal changes due to many factors.Among them,the influence of atmospheric loading on the horizontal deformation of the crustal is one of them.This paper selects the influence of atmospheric loading on the horizontal deformation of the crustal as the research object.The study area is 102°?107° east longitude and north latitude.In some areas of Gansu,N ingxia and Q inghai at 34°?38°,download the global atmospheric model and regional weather station pressure data for the region from 2012 to2017 through the websites of European Meteoro logical Center and China Meteorological Station,and extract the downloaded weather data And transformation,using atmospheric load theory and removal recovery method to convert air pressure data into horizontal deformation and vertical deviation data.By a nalyzing the deformation data for the whole year in 2017,it is concluded that the horizontal deformation characteristics of the same area in a year will change correspondingly with the different seasons.The influence of the atmospheric load on the horizontal deformation in winter reaches the minimum value of 0.2 mm,from northeast to southwest.Movement in the direction;the largest deformation in summer,1.3 mm,moves from northeast to southwest.The horizontal deformation characteristics of the same mon th in the six years tend to be consistent,indicating that the influence of atmospheric load on the horizontal velocity field of a certain area obeys the annual cyclical change.In order to observe the deformation law of a specific area,4 continuous obser vation data of Lanzhou(GSLZ),Pingliang(GSPL),Haiyuan(NXHY),and Zhongwei(NXZW)were selected as the research objects.It was found that the horizontal deformation characteristics of the 4 observation stations also obey the seasons.In terms of nature and annual periodicity,the GSLZ station has the largest variation of the 4 stations,reaching 1.3 mm,and the GSPL and NXZW stations have the smallest annual variation of 1 mm.The 6-year average variation range of the 4observation stations fluctuates between 0.35 and 0.90 mm,indicating that the influence of atmospheric load on the horizontal deformation of the crust has a certain degree of stability and periodicity.In physical geodesy,the vertical deviation is the vertical tilt change corresponding to the horizontal deformation.The comparison of the vertical deviation and the horizontal deformation characteristics shows that the vertical deviation change characteristics also obey the seasonal and annual periodicity.4 observation stations The annual change range of NXHY fluctuates between 3-5 ms.The change range of N XHY station is the largest among the 4observation stations,which is 5.6 ms,and the change range of GSPL station is the smallest,which is 3 ms.The annual average change is stable between 1.6-3.0 ms,indicating that the range of the vertical deviation is also maintained within a specific range.The influence of atmospheric load on the horizontal deformation of the earth's crust has seasonal and annual periodic characteristics,and the range of change tends to be stable,and the magnitude of the change is mm.The amplitude of the vertical deviation also has the characteristics of seasonal and annual cyclical changes.