Study and Establishment of Regional Elastic Block Strain Model Based on GPS data

摘要

This paper mainly studies how to use the measured GPS data to build a rational regional crustal elastic block strain model, and chooses Xi'an as the research object. Based on the GPS monitoring data from 2006 to 2008, and by further made significant hypothesis test whether the parameters of the model can reflect the regional internal deformation characteristics, the rational regional crustal elastic block strain model of Xi'an areas is built combined with the special tectonic feature. According to the abovementioned, the present crustal tectonic strain parameters and its accuracy indicators of Xi'an areas are obtained. And it is also revealed that the present strain field characteristics of Xi'an areas. The results show that the present tectonic strain fields have obvious differences between Xian southern and northern areas. The present tectonic strain fields of Xi'an southern part mainly demonstrates tensile strain with NNW-SSE direction, with the maximum value of the tensile strain reached 3.25 × 10~(-7)/y, while the present tectonic strain fields of Xi'an northern part mainly demonstrates compression strain with NNW-SSE direction, with the maximum value of the tensile strain reached -3.07 × 10 ~(-7)/y. This strain characteristic is corresponding to the imbalance distribution of ground fissures between Xian southern and northern areas.