摘要
By using the integral dynamic adjustment of the "segmentation rate," this paper processes the leveling repetition measurement data of the Dianxi(western Yunnan)area since the 1980s,makes the fitting of the velocity surface for vertical deformation with multi-surface function,and splits information of the vertical deformation field.The dynamic evolution of the deformation field and vertical deformation information norm-shear deformation,extension deformation,volumetric deformation,and quasi acceleration,which are the distribution characteristics of variation,are studied by using the information split before the Lijiang earthquake with MS7.0(February 3,1996)in the north of the Dianxi(western Yunnan)leveling network.The results indicate that in Dianxi(western Yunnan)area,the acute vertical differential movement of the large-scale deformation velocity high gradient belt and high information norm distribution in the Lijiang,Yongsheng,and its adjacent areas in the middle stage of the 1980s is the reflection
By using the integral dynamic adjustment of the 'segmentation rate,' this paper processes the leveling repetition measurement data of the Dianxi(western Yunnan)area since the 1980s,makes the fitting of the velocity surface for vertical deformation with multi-surface function,and splits information of the vertical deformation field.The dynamic evolution of the deformation field and vertical deformation information norm-shear deformation,extension deformation,volumetric deformation,and quasi acceleration,which are the distribution characteristics of variation,are studied by using the information split before the Lijiang earthquake with MS7.0(February 3,1996)in the north of the Dianxi(western Yunnan)leveling network.The results indicate that in Dianxi(western Yunnan)area,the acute vertical differential movement of the large-scale deformation velocity high gradient belt and high information norm distribution in the Lijiang,Yongsheng,and its adjacent areas in the middle stage of the 1980s is the reflection of the starting seismogeny strain energy accumulation before the Lijiang earthquake with MS7.0 for ten years; during 1985-1992,the turning of the deformation field tendency and obviously weakening of the vertical differential movement may be the seismogenic zone that is in a relatively blocking stage for seismogenic energy accumulation to a definite extent.On this basis,combining the seismicity analysis of this area before the Lijiang MS7.0 earthquake with macroseismic seismogeny deformation for different areas,the pre-seisniic deformation field nonhomogeneous state and the seismogeny information acquisition have been further studied and the useful conclusion for medium-term prediction of strong earthquakes by using the geodetic deformation has been obtained.
基金
This project was sponsored by the "Ninth Five-Year Science
Technology Plan" (95-04-04-01-01) of the State Seismological Bureau, China
