Abstract：Taking the observation data of Zhangzhou station, Fujian as an example, we determined direction of the additional strain field in observation area from data of multicomponent borehole strainmeter. According to the characteristics of observation data, the dynamic strain field can be decomposed into the background strain field and the additional strain field. In order to study the variation characteristics of principal strain directions of the additional strain field, we used the formula of “lined borehole model” to calculate the vectors in principal strain directions. We also drew the vector trajectory diagram, and it is a clockwisely rotating ellipse. There was a phenomenon that the diagrams were more disordered and dispersed than the normal before the Ms 6.7 earthquake occurred in Gaoxiong, Taiwan, on March 4, 2010.
Zhong Jimao ,Li Zuning ,Xie Zhizhao et al. DETERMINATION OF DIRECTION OF ADDITIONAL STRAINFIELD IN OBSERVATION AREA FROM DATA OF MULTI-COMPONENT BOREHOLE STRAINMETER[J]. jgg, 2011, 31(1): 29-33.
