THE EXPERIMENTAL RECONSTRUCTION OF THE EXTENSOMETER IN HUAILAI SEISMOSTATION

An experimental reconstruction of the disposal of the extensometer(EW: base line,fixed end and sensor) is made in Huailai Station.The precision of observational data at extensometer before and after reconstruction are compared.The mean value of the relative error in 2008 is 0.094 8,and is better than in 2007 (before the reconstruction).Meanwhile,the interferences are decreased significantly.Result show that the effects are significant after the reconstruction.