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| Titel |
An automatic continuous monitoring station for groundwater geochemistry at an active fault zone in SW Taiwan |
| VerfasserIn |
Chun-Wei Lai, Tsanyao F. Yang, Ching-Chou Fu, David R. Hilton, Tsung-Kwei Liu, Vivek Walia, Tzu-Hua Lai |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250108250
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| Publikation (Nr.) |
 EGU/EGU2015-7995.pdf |
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| Zusammenfassung |
| Previous studies have revealed that gas compositions of fluid samples collected from
southwestern Taiwan where many hot springs and mud volcanoes are distributed along
tectonic sutures show significant variation prior to and after some disaster seismic events.
Such variations, including radon activity, CH4/CO2, CO2/3He and 3He/4He ratios of gas
compositions, are considered to be precursors of earthquakes in this area. To validate
the relationship between fluid compositions and local earthquakes, a continuous
monitoring station has been established at Yun-Shui, which is an artesian well located
at an active fault zone in SW Taiwan. It is equipped with a radon detector and a
quadrupole mass spectrometer (QMS) for in-situ measurement of the dissolved gas
composition. Data is telemetered to Taipei so we are able to monitor variations of gas
composition in real time. Furthermore, we also installed a syringe pump apparatus for the
retrieval and temporal analysis of helium (SPARTAH) at this station. From the
SPARTAH samples, we can obtain detailed time series records of H-O isotopic
compositions, DIC concentration and δ13C isotopic ratios, and anion concentration of the
water samples at this station. After continuous monitoring for about one year, some
anomalies occurred prior to some local earthquakes. It demonstrates that this automated
system is feasible for long-term continuous seismo-geochemical research in this
area.
Keywords: monitoring; geochemistry; isotope; dissolved gases; pre-seismic signal. |
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