jgg     2012 32 (2):  7-10    ISSN: 0412-1961  CN: 21-1139/TG STUDY ON STRAIN FIELD AROUND ZHANGJIAKOU-BOHAI SEISMIC BELT WITH LEAST-SQUARE COLLOCATION Jin Honglin 1) ; Hu Xinkang 2) ;and Wang Yuebing 1) 1)Institute of Earthquake Science, CEA， Beijing 100036;2)First Crust Monitoring and Application Center, CEA, Tianjin 300180 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null