Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Tracking of the Moryang Fault and It's Characteristics

모량단층의 분포와 특성

  • Choi, Sung-Ja (Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Ryoo, Chung-Ryul (Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Choi, Jin-Hyuck (Korea Institute of Geoscience and Mineral Resources (KIGAM))
  • 최성자 (한국지질자원연구원 국토지질연구본부 활성지구조연구단) ;
  • 류충렬 (한국지질자원연구원 국토지질연구본부 활성지구조연구단) ;
  • 최진혁 (한국지질자원연구원 국토지질연구본부 활성지구조연구단)
  • Received : 2021.05.28
  • Accepted : 2021.06.25
  • Published : 2021.06.28
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Abstract

Moryang Fault is geomorphologically observed as a linear fault valley from Angang through Moryang, Duckhyun and Wondong to Gimhae, and contacts with Yangsan Fault, being obliquely away to the east, at Angang disrict. The fault valley appears a V-shape feature with a width from 100 to 300 m, and has fragmental zones of the fault along the valley on a small scale. Nine fault-outcrop localities were found along the nine-kilometers valley between Daehyun-ri, Gyeongju, and Baenaemi-gogae, Yangdong-ri, Ulsan. The fault strikes the North-North-East to the Northeast and dips to the Northwest with high angles, and reveals it had been undergone predominantly sinistral reverse fault movement sense, left-lateral and right-lateral strike-slip sense in bedrocks. However, after unconsolidated sediments, there was the top-up-to-the-east dextral reverse fault movement.

모량단층은 안강-모량-덕현-원동-김해를 잇는 선상의 단층곡으로부터 인지되며, 동측에 발달하는 양산단층과 안강 인근에서 만난다. 단층곡은 100-300 m 폭의 V자 형태를 보이며, 단층곡을 따라 수 m 내외의 폭을 가지는 소규모 단층파쇄대가 발달한다. 약 9 km에 달하는 경주시 대현리-울산 양동리 배내미고개 구간에서 9개 지점의 단층노두들이 확인되었으며, 단층은 주로 북북동 내지 북동 주향과 고각의 북서 경사를 가진다. 기반암내에서 단층은 좌향 이동성분을 갖는 역단층운동, 좌수향과 우수향주향이동단층운동이 관찰되었으며, 미고결퇴적층이 형성된 이후에는 단층의 서측이 동쪽으로 상승하는 우향이동성분의 역단층 운동을 하였다.

Keywords

Acknowledgement

본 연구의 야외조사에 많은 도움을 주신 한국지질자원연구원의 이봉주회원과 한국환경정책평가연구원의 이영준회원에게 감사드립니다. 이 논문은 한국지질자원연구원의 과학기술정보통신부 주요사업 "판내부 활성지구조 특성연구 및 단층 분절모델개발"(과제코드 GP2020-014/21-3116) 과 국민안전처의 국가개발연구사업인 "한반도 단층구조선의 조사 및 평가기술개발"(과제코드NP2017-037/21-9501) 일환으로 수행되었습니다. 논문에 대한 많은 유익한 조언으로 논문 내용을 한층 더 발전시켜주신 익명의 심사자분들께 감사드립니다.

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