Wenchuan (Ms ¼ 8.0) and Lushan (Ms ¼ 7.0) earthquakes occurred along Longmenshan fault, the southern part of which was associated with the triggering of Lushan and central part was
associated with Wenchuan with separation of 85 km. Both the earthquakes (Wenchuan e Ms ¼ 8.0 and Lushan e Ms ¼ 7.0) occurred along Longmenshan fault confirm that Longmenshan fault is one of the active faults. In China, efforts are being made to monitor numerous subsurface, water well and spring parameters through a large network of stations distributed in China sponsored by China Earthquake Administration (CEA). All the data from these network is managed by China Earthquake Network Center (CENC). Water and gas radon are also being monitored in China since more
than one decade. We have considered water radon data during 2002 until February 2014 from 6 stations located around the Longmenshan fault. Wenchuan earthquake occurred at the steep
eastern margin of the Tibetan plateau in the Sichuan province of China on May 12, 2008,