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RISS 인기검색어
- 검색키워드
- 주제어 : Sedimentary/seismic unit (검색결과 2 건)
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Kim, Gil Young,Park, Ki Ju,Lee, Gwang Soo,Yoo, Dong Geun,Kong, Gee Soo Elsevier 2019 Quaternary international Vol.503 No.1
<P><B>Abstract</B></P> <P>Thirty-two core samples were collected from the continental shelf area of the South Sea, Korea. They have been used to characterize physical properties in relation to sedimentary units (interpreted from seismic and core data) and to interpret physical property variation as a function of burial depth. The physical property data were readily classified into sedimentary units: Units S1, S2, S3, S4, and S5, in descending order. The variations in physical properties reflect well the relative characteristics of sedimentary units (equivalent to seismic units). Moreover, the relationships between physical properties are well grouped by each sedimentary unit. In addition, the distributions of physical properties match well with the grain size distribution and bathymetry of the study area. In particular, the lithology (e.g., grain size) plays an important role in the variation of physical properties. These results suggest that the physical properties of these sediments are mainly controlled by depositional processes in the vicinity of the paleo-Seomjin River, and that sea-level change specifically was a dominant sedimentary processes in the study area during the Quaternary. In particular, the physical properties of Unit S2 do not show transitional characteristics between Units S1 and S3, although it belongs to the transition zone in sequence order. This finding is attributed to the fact that compared with the sediments of Units S1 and S3, Unit S2 is composed of more coarse-grained sediments with abundant shell fragments.</P>
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곰소만 지역의 기반암 및 상부 층서 파악을 위한 시험 탄성파반사법 탐사
김지수 ( Ji Soo Kim ),양우헌 ( Woo Hun Ryang ),한수형 ( Soo Hyung Han ),김학수 ( Hak Soo Kim ) 대한지질공학회 2006 지질공학 Vol.16 No.2
곰소만의 기반암과 상부 층서들을 규명하기 위해 짧은 측선의 탄성파 반사법탐사가 수행되었다. 이 연구는 주로 자료처리에서 신호대잡음을 높임으로써 기반암을 규명하는데 초점을 두었다. 자료처리의 주요과정은 중합 전후과정에서 모두 큰 진폭의 잡음에 가려진 신호성분을 향상시키는데 중점을 두었으며 시변필터, 불량 트레이스 제거, f-k 필터와 NMO 보정 후의 뮤팅 등이 이에 포함된다. 이 연구에서 규명된 기반암과 상부 층서들은 이전에 수행된 MT자료의 결과와 대체로 일치하며 당시에 자료질의 한계로 규명되지 못한 측선 중앙부근에서 기반암 표면이 약 30m 깊이의 수평층으로 나타났다. A short seismic reflection survey was performed to map the basement and the upper units in the Gomso Bay. This research was mainly aimed at clarifying the basement by improving the signal-to-noise ratio in data processing steps. The strategies employed in this research included enhancement of the signal interfered with large-amplitude noise, through pre- and post-stack processing such as time-variant filtering, bad trace edit, careful muting after f-k filter and NMO correction. The subsurface structure mapped from this survey mainly consists of the top of basement and the upper three units, which were well correlated to the result from the previously conducted MT survey. Furthermore seismic section clarifies approximately 30m deep subhorizontal event of the top of the basement, which was not shown in the central portion of the MT section due to data quality.
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