Hydrochemical characteristics of hot spring waters in the Kangding district related to the Lushan <i>M</i><sub>S</sub> = 7.0 earthquake in Sichuan, China
Hydrogeochemistry of 10 hot springs in the Kangding district was investigated by analyzing cation and anion concentrations in the spring water. The water samples were collected in the 5 days after the Lushan <i>M</i><sub>S</sub> = 7.0 earthquake, which occurred on 20 April 20...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-06-01
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| Series: | Natural Hazards and Earth System Sciences |
| Online Access: | http://www.nat-hazards-earth-syst-sci.net/15/1149/2015/nhess-15-1149-2015.pdf |
| Summary: | Hydrogeochemistry of 10 hot springs in the Kangding
district was investigated by analyzing cation and anion concentrations in
the spring water. The water samples were collected in the 5 days after the
Lushan <i>M</i><sub>S</sub> = 7.0 earthquake, which occurred on 20 April 2013. The spring waters
are classified into seven chemical types based on their hydrochemical
compositions. Compared with hydrochemical data before the Lushan
earthquake, concentrations of Ca<sup>2+</sup>, HCO<sub>3</sub><sup>-</sup> and total dissolved solid (TDS) in water
samples from the Guanding, Erdaoqiao, Gonghe, Erhaoying, Tianwanhe and Caoke
springs significantly increased, which may be the result of a greater increase in
groundwater from carbonate rocks, and water–carbonate rock
interactions, enhanced by the increment of CO<sub>2</sub>. Concentrations of Na<sup>+</sup>, Cl<sup>-</sup>
and SO<sub>4</sub><sup>2-</sup> in water samples from the Guanding, Zheduotang,
Xinxing and Gonghe springs decreased, indicating a dilution of shallow waters.
Concentrations of Na<sup>+</sup> and SO<sub>4</sub><sup>2-</sup> in water samples from the
Erhaoying spring water increased, which may be attributed to water–granite
interactions enhanced by H<sub>2</sub>S. The results indicated that hydrochemical
components of spring water could be used as an effective indicator for earthquakes. |
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| ISSN: | 1561-8633 1684-9981 |