jgg     2012 32 (增1):  176-179    ISSN: 0412-1961  CN: 21-1139/TG CONTRASTIVE ANALYSIS OF OBSERVATIONAL RESULTSOF THREE KINDS OF EXTENSOMETER Deng Jiangang 1,2) ; and Sun Lingli 1,2) 1)Monitoring Center of Earthquake Adminisrtation of Hube Province,Wuhan 430071;2)Key Laboratory of Earthquake Geodesy,Institute of Seismology, CEA, Wuhan 430071 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null