Journal of Conservation Science (보존과학회지)

The Korean Society Of Conservation Science For Cultural Heritage (한국문화재보존과학회)
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Deterioration Evaluation and Petrological Characteristics of the Rock‐carved Seated Buddha of Hwasun Unju Temple, Korea

화순 운주사 마애여래좌상의 암석학적 특성 및 손상도 평가

  • Lee, Jang Jon (Conservation Science Division, National Research Institute of Cultural Heritage) ;
  • Kim, Jae Hwan (X-ray Lab, Center for Research Facilities, Chosun University) ;
  • Lee, Su Yea (Conservation Institute of Buddhist Temple Cultural Heritage)
  • 이장존 (국립문화재연구소 보존과학연구실) ;
  • 김재환 (조선대학교 장비운영센터 X-선분석실) ;
  • 이수예 ((사)사찰문화재보존연구소)
  • Received : 2016.10.17
  • Accepted : 2017.02.10
  • Published : 2017.02.20
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Abstract

The rock-carved seated Buddha of Unju temple of Hwasun, Jeonnam, the only Triad Buddha among the stone Buddhas of Unju temple, is currently designated as a tangible cultural property No. 275 of Jeollanam-do. The rock of the seated Triad Buddha bedrock is light-green andesitic tuff breccia that is composed of quartz and feldspar. The results of measurement of the whole rock magnetic susceptibility characteristics, the rock consists of a single sedimentary layer from top to bottom. The results of ultrasonic velocity measurement, show that the number of frequency of 1500~2000 m/s increased and the number of frequency of 2000~2500 m/s decreased in 2009 compared to 2015, and the measurement value for 2000 m/s or below was 87.5% in 2015, a 68.8% increase in comparison to that in 2009. Moreover, on the top, bottom, left side, and head areas of the Triad Buddha, a partial expanding tendency was observed in the range of low ultrasonic velocity. As weathering of the Triad Buddha occurs in the long term, on-going monitoring is required to ascertain the degree of change with time.

전남 화순 운주사 마애여래좌상은 운주사 석불군 가운데 유일한 마애불로써 현재 전라남도 유형문화재 제275호로 지정되어 있다. 암반의 암석은 연녹색의 안산암질 응회각력암으로써 구성광물은 석영과 장석으로 이루고 있다. 전암대 자율 측정 결과, 상부에서부터 하부까지 단일 퇴적층으로 구성되어 있다. 초음파 속도 측정 결과, 2009년에 비해 2015년은 1500~2000 m/s의 빈도수는 증가하고, 2000~2500 m/s의 빈도수는 감소하였으며, 2015년에 2000 m/s이하의 측정값이 87.5%로 2009년의 68.8%에 비해 증가하였다. 또한 마애여래좌상의 상부, 하부, 왼쪽부분 및 머리 등에서 부분적으로 저속대의 범위가 확장되는 경향이 관찰되었다. 마애불의 대한 풍화는 장기적으로 발생하기 때문에 시간 경과에 따른 변화 정도를 확인하기 위해서는 지속적인 모니터링이 필요할 것으로 판단된다.

Keywords

References

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