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2018 Vol.28, Issue 2 Preview Page

Research Article

Relationship of Radon-222 and Chemical Composition of Groundwater as a Precursor of Earthquake

지진 전조인자로서 지하수내 라돈 및 화학성분의 상관성 연구

Chan Ho Jeong1*
,
Jun Sik Park1
,
Yong Cheon Lee1
,
Yu Jin Lee1
,
Jae Ha Yang2
,
Young Suk Kim3
,
Song Min Ou1
정 찬호1*
,
박 준식1
,
이 용천1
,
이 유진1
,
양 재하2
,
김 영석3
,
오 송민1
1Department of Construction Safety and Disaster Prevention Engineering, Daejeon University
2EGI Consulting
3Department of Geological Environment, Bukyoung National University
1대전대학교 건설안전방재공학과
2이지아이 컨설팅
3부경대학교 지구환경과학부
* 교신저자* Corresponding Author
30 June 2018. pp. 313-324
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Abstract

In order to study the earthquake precursor in the Korean peninsula, long-term variations of chemical composition, radon-222, and water level were measured at depths (-60 m, -100 m) in the groundwater monitoring wells of the Daejeon and the Cheongwon area. The pH and electrical conductivity of groundwater in the monitoring wells showed some relationship with the Pohang earthquake. The HCO3- and Cl- concentration of groundwater in the Daejeon and Mg2+, Cl- and NO3- in the Cheongwon showed some relation with the Pohang earthquake. However, it is not distinct to find the relationship between their variation and earthquake. The radon-222 concentration in Daejeon was observed a significant increase from a minimum of 162 Bq/L prior to the earthquake to 573 Bq/L right after the earthquake, that indicating a strong correlation with earthquakes. In the case of groundwater levels, it can not find some correlation between earthquakes and continuous decreasing trend in the monitoring wells of Daejeon and Cheongwon area. However, water level of a national groundwater observation well within 10 kilometers of Pohang epicenter was recorded as an abrupt drop right before the earthquake. Conclusively, although the location of monitoring wells is more than 180 kilometers apart from the epicenter of the Pohang earthquake, the radon gas in groundwater can be considered as a reliable candidate among earthquake precursors. The pH, electrical conductivity, HCO3- and Cl- among hydrochemicals showed some correlation with earthquake should be monitored during a longer term to recognize distinctly as a precursor of earthquake.

Keywords
Earthquake
Groundwater
Radon-222
Chemical composition
Precursor

한반도 지진에 대한 전조인자 연구를 위해 대전, 청원지역 지하수 관측정에서 심도별(-60 m, -100 m)로 화학성분과 라돈, 수위변화를 주기적으로 측정하였다. 관측정 특정심도 지하수의 pH와 전기전도도 값이 포항지진 발생에 따라 큰 폭으로 증가하는 등 비교적 뚜렷한 상관성을 보였다. 주요화학 성분 중에는 대전관측정에서는 HCO3-, Cl-의 농도가 지진과의 연관성 있는 변동을 보이며, 청원지역 관측정에서는 Mg2+, Cl-, NO3-의 농도가 변화를 보였다. 그러나 지하수의 주요 화학성분의 변화는 지진발생과의 상관성이 명확하지는 않다. 대전관측정 지하수내 라돈 함량은 지진 발생 전 최저 162 Bq/L에서 지진발생 직후 573 Bq/L로 크게 증가하는 경향을 보여 지진과의 뚜렷한 상관성을 보여주었다. 지하수위의 경우에는 지진발생과의 상관성은 확인되지 않고 갈수기로 인한 지속적인 하강의 양상을 보여주었다. 그러나 포항 진앙지 10 km 이내 국가 지하수 관측정에서는 지진발생 직전 뚜렷한 지하수위의 하강 현상을 보여주었다. 결론적으로 포항지진 진앙지와 약 180 km 이상 떨어진 지역이지만 대전 관측정에서 라돈가스는 지진과 가장 뚜렷한 상관성을 보여 지진전조인자로서의 신뢰성할 수 있는 후보로서 가능성을 확인하였다. pH, 전기전도도, HCO3-, Cl- 성분은 지진과 일정 부분 상관성을 보여주었지만 보다 더 장기적인 모니터링을 통하여 지진전조로서 가능성을 확인할 수 있을 것으로 보인다.

키워드
지진
지하수
라돈-222
화학조성
전조인자
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 28
  • No :2
  • Pages :313-324
  • Received Date : 2018-06-11
  • Revised Date : 2018-06-18
  • Accepted Date : 2018-06-21
  • DOI :https://doi.org/10.9720/kseg.2018.2.313
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