Hot spring water observations and its anomalies before the Lushan MS7.0 earthquake in the western Sichuan region
Yan Rui
Guan Zhijun
Liu Yaowei
Abstract：On the basis of field survey of fluid observation sites near the epicen-ter of 2013 Lushan MS 7.0 earthquake,hot spring temperature data observed at the sites with better observation environment and little human disturbance in the western Sichuan Province were selected to perform retrospective analysis. The results showed that different degrees of water temperature anomalies were observed at Longtougou and Erdaoqiao sites in Kangding region,Longpugou site in Daofu county,Maoya site in Litang county,Gonghe site in Luding coun-ty before the Lushan MS 7.0 earthquake.It was mainly showed that the mid-term anomalies about two years of time scale were observed at Maoya and Long-pugou hot spring sites far from the epicenter of Lushan earthquake;while the short-term anomalies within three months preceding the earthquake were ob-served at Longtougou and Erdaoqiao hot spring sites which were close to the earthquake epicenter.By the spring water hydrochemistry and δD-δ18 O stable isotopes analysis,it was suggested that these hot spring water have deep circu-lation characteristics,so the temperature changes of hot spring water can sensi-tively reflect deep crustal information in respect of geothermal and tectonic changes,which was the possible cause for the anomalies observed at the hot spring water preceding the Lushan earthquake.It was significant for the region-al earthquake prediction research to strengthen observation of these hot spring sites.
Keywords：Lushan MS 7.0 earthquakehot springwater temperaturehydro-chemistry
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 347-356 )