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青海省乐都气氡观测的对象为断裂带土壤逸出气氡浓度.该测项自2007年开始施测,但直至2013年完成观测装置的完善与更新后,才开始产出连续稳定的数据产品.2014年至2016年初的气氡观测曲线呈现清晰完整的年变形态.2016年1月21日门源发生M_S6.4地震,其震中距乐都观测点140km,震前乐都气氡观测曲线出现年变形态异常变化.
The observation of gas radon in Ledu County of Qinghai Province is radon concentration of escaped gas in the fracture zone, which has been measured since 2007. However, it does not start to produce continuous and stable data until the completion and updating of the observation device in 2013 Product.The gas radon observation curve from 2014 to the beginning of 2016 showed a clear and complete annual deformation.M21 earthquake occurred on January 21, 2016 with an epicenter distance of 140 km from the Le Du observation point, Curves appear abnormal changes in annual change.