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Anomalous decrease in groundwater radon before the Taiwan M6.8 Chengkung earthquake.

T Kuo1, K Fan, H Kuochen

  • 1Department of Mineral and Petroleum Engineering, National Cheng Kung University, Tainan, Taiwan.

Journal of Environmental Radioactivity
|March 15, 2006
PubMed
Summary
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Groundwater radon levels decreased significantly 65 days before Taiwan's 2003 Chengkung earthquake. This finding suggests radon anomalies can indicate crustal strain changes preceding seismic events.

Area of Science:

  • Geophysics
  • Environmental Science
  • Seismology

Background:

  • The 2003 Chengkung earthquake (M 6.8) was the strongest seismic event in eastern Taiwan since 1951.
  • Precursory seismic phenomena are crucial for earthquake prediction and understanding.

Purpose of the Study:

  • To investigate precursory changes in groundwater radon concentration before the 2003 Chengkung earthquake.
  • To assess the potential of groundwater radon as an earthquake precursor.

Main Methods:

  • Monitoring groundwater radon concentration at the Antung radon-monitoring station.
  • Analyzing radon concentration data in relation to the seismic event.

Main Results:

  • A significant decrease in groundwater radon concentration was observed approximately 65 days before the earthquake.

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  • Radon levels dropped from a background of 28.9 BqL(-1) to a minimum of 12.2 BqL(-1).

    • Conclusions:

    • Groundwater radon can serve as a sensitive indicator of crustal strain changes preceding earthquakes.
    • Suitable geological conditions enhance the reliability of radon as a seismic precursor.