jgg     2011 31 (1):  29-33    ISSN: 0412-1961  CN: 21-1139/TG DETERMINATION OF DIRECTION OF ADDITIONAL STRAINFIELD IN OBSERVATION AREA FROM DATA OF MULTI-COMPONENT BOREHOLE STRAINMETER Zhong Jimao 1) ; Li Zuning 1) ; Xie Zhizhao 2) ;and Yuan Dingqiang 1) 1)Earthquake Administration of Fujian Province, Fuzhou 3500032)Xiamen Research Centre of Seismologic Surveying, Xiamen 361021 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null