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2020 Vol.30, Issue 4 Preview Page

Research Article

Liquefaction Hazard Assessment according to Seismic Recurrence Intervals Using Simple Estimating Method in Busan City, Korea

간이평가법을 이용한 지진재현주기별 부산광역시 액상화 재해 평가

Hyunjee Lim1
,
Rae-yoon Jeong2
,
Dongha Oh3
,
Hyejin Kang4
,
Moon Son5*
임 현지1
,
정 래윤2
,
오 동하3
,
강 혜진4
,
손 문5*
1Ph.D. Student, Department of Geological Sciences, Pusan National University
2Master, Department of Geological Sciences, Pusan National University
3Senior Research Fellow, Urban Environment Research Lab, Busan Development Institute
4Master Student, Department of Geological Sciences, Pusan National University
5Professor, Department of Geological Sciences, Pusan National University
1부산대학교 지질환경과학과 박사과정
2부산대학교 지질환경과학과 석사
3부산발전연구원 도시 ‧ 환경연구실 선임연구위원
4부산대학교 지질환경과학과 석사과정
5부산대학교 지질환경과학과 교수
*Corresponding Author
31 December 2020. pp. 589-602
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Abstract

As can be seen in many earthquakes, liquefaction causes differential settlement, which sometimes produces serious damages such as building destruction and ground subsidence. There are many possible active faults near the Busan city and the Yangsan, Dongrae, and Ilgwang faults among them pass through the city. The Busan city is also located within the influence of recent earthquakes, which occurred in the Gyeongju, Pohang, and Kumamoto (Japan). Along the wide fault valleys in the city, the Quaternary unconsolidated alluvial sediments are thickly accumulated, and the reclaimed lands with beach sediments are widely distributed in the coastal area. A large earthquake near or in the Busan city is thus expected to cause major damage due to liquefaction in urban areas. This study conducted an assessment of the liquefaction hazard according to seismic recurrence intervals across the Busan city. As a result, although there are slight differences in degree depending on seismic recurrence intervals, it is predicted that the liquefaction potential is very high in the areas of the Nakdonggang Estuary, Busan Bay, Suyeong Bay, and Songjeong Station. In addition, it is shown that the shorter the seismic recurrence interval, the greater difference the liquefaction potential depending on site periods.

Keywords
liquefaction
liquefaction potential index (LPI)
hazard assessment
hazard map
seismic recurrence interval

과거의 많은 지진 사례에서 볼 수 있듯이 액상화 현상은 부등침하를 일으키고 심한 경우 건물 파괴, 지반 함몰과 같은 심각한 피해를 유발한다. 연구지역인 부산광역시 인근에는 지진발생 가능성이 높은 단층들이 분포하며 양산단층, 동래단층, 일광단층이 도심지를 통과하고 있다. 또한 최근 발생한 경주, 포항, 일본 구마모토 지진의 영향권 내에 위치하며, 도시 내 넓은 단층곡을 따라서 두꺼운 제4기 미고결 충적층이 발달하고 해안 지역에는 해빈 퇴적물과 함께 매립지가 넓게 분포한다. 따라서 부산광역시 인근에서 대형 지진이 발생할 경우 도심지 내에 액상화로 인한 큰 피해가 예상되어, 도시 전 지역을 대상으로 지진재현주기별 액상화 발생 가능성을 평가하였다. 그 결과, 지진재현주기에 따라 정도의 차이는 존재하나 낙동강 하구 평야지대와 부산만, 수영만, 송정역 일대에서 액상화 발생 가능성이 매우 높은 것으로 예측되었다. 또한 짧은 지진재현주기일수록 부지주기에 따라 상당히 다른 결과가 도출된 반면, 재현주기가 길어질수록 부지주기에 관계없이 그 결과는 비슷한 양상을 보였다.

키워드
액상화
액상화 가능지수(LPI)
재해평가
재해지도
지진재현주기
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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 : 30
  • No :4
  • Pages :589-602
  • Received Date : 2020-11-18
  • Revised Date : 2020-12-15
  • Accepted Date : 2020-12-21
  • DOI :https://doi.org/10.9720/kseg.2020.4.589
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