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Anomalous decrease in groundwater radon before 2016 Mw 6.4 Meinong earthquake and its application in Taiwan.

T Kuo1, W Chen2, C Ho3

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

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|February 25, 2018
PubMed
Summary
This summary is machine-generated.

Groundwater radon levels at Paihe spring decreased before major earthquakes in Taiwan, indicating radon anomalies can aid in local earthquake forecasting. This suggests fractured aquifers act as natural strain meters for seismic events.

Keywords:
EarthquakeGroundwaterMagnitudeRadon-222

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Area of Science:

  • Geophysics
  • Environmental Science
  • Seismology

Background:

  • Recurrent groundwater radon anomalies were observed at Paihe spring (P1) in southwestern Taiwan.
  • These anomalies occurred prior to the Mw 6.3 Jiasian (2010) and Mw 6.4 Meinong (2016) earthquakes.

Purpose of the Study:

  • To investigate the correlation between groundwater radon anomalies and seismic events.
  • To assess the potential of using radon as a tracer for earthquake warning systems.

Main Methods:

  • Monitoring groundwater radon concentrations at Paihe spring.
  • Analyzing radon concentration data in relation to earthquake occurrences.
  • Corroborating findings with seismic data and epicenter distances.

Main Results:

  • Groundwater radon concentrations at Paihe spring showed significant precursory declines before both the 2010 Jiasian and 2016 Meinong earthquakes.
  • Radon levels dropped from background concentrations to minima prior to each event.
  • The Paihe spring, located near the earthquake epicenters, demonstrated its utility as a natural strain meter.

Conclusions:

  • The study corroborates that small fractured aquifers can serve as effective natural strain meters.
  • Radon anomalies in groundwater can be utilized as a tracer for earthquake warning in southwestern Taiwan.
  • Long-term monitoring of precursory declines in groundwater radon offers valuable data for forecasting local earthquakes.