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김진후(Kim Jin-Hoo),김현도(Kim Hyun-Do) 동아대학교 해양자원연구소 2000 동아대학교 해양자원연구소 연구논문집 Vol.13 No.-
Determining the depth and geometry of a sub-surface structure is a difficult task, especially in the steep and rugged mountain where even a drilling machine cannot be carried and installed on it. Potential field methods generally lack the necessary depth resolution, and seismic reflection data are much influenced by complex geometry of the structure. To address this problem, we have applied a surface 2-D tomographic refraction scheme that is based on an inversion method that incorporates appropriate damping and smoothing constraints. This scheme has been applied to a first-arrival traveltime data set collected over a tunnel route. Seismic data were collected along 10 profiles, and each profile consists of 5 shots and 24 receivers. Reliability of the resultant velocity tomograms were estimated on the basis of (1) plots of the difference between synthetic and observed traveltime(traveltime residual analysis), and (2) RMS errors with diverse input models. The sub-surface structure can be grouped in 2 layers, i.e. soil/weathered rock and basement. The thickness of the near-surface natural soil/weathered rock layer varied between 0 and 10 m, with occasional thickening to 30m. The depth to the basement could be traced to 9~11 m. Several low velocity zones which are developed in vertically have been found along the profiles. The low velocity zones are considered as weak and fracture zones, so that appropriate supporting methods must be considered when planning and great attentions must be paid during tunneling.
김진후(Kim Jin-Hoo),박경원(Park Kyung-Weon),김현도(Kim Hyun-Do) 동아대학교 해양자원연구소 2000 동아대학교 해양자원연구소 연구논문집 Vol.13 No.-
A marine seismic exploration with the 400㎐ bubble pulser 1200 system was carried out.<BR> The seismic survey was conducted along the 5 survey lines(total length of 4㎞), and the aim of this survey was to profile depth of sediment layer and bedrock with SINCDAS(Single Channel Data Acquisition System) developed by this study. The field data is displayed with variabel-density method and compared with borehole log to confirm accuracy of seismic data interpretation.<BR> The subsurface structure consists of the upper clay layer and the lower silt-clay layer. But the bedrock depth is not found because of extremely shallow survey depth and multiple reflections.
김진후(Jin-hoo Kim),김현도(Hyun-do Kim) 동아대학교 해양자원연구소 2006 동아대학교 해양자원연구소 연구논문집 Vol.18 No.-
A sparker source with the center frequency of 1㎑ or higher can not be easily applied for the multi-channel marine seismic survey because of stacking difficulties. Thus, it has been applied mainly to the single channel marine seismic survey. For examining the applicability of sparker source to multi-channel marine seismic survey, 8-channel seismic data were obtained from the field and processed, and a 2-D seismic section was drawn up. From this study it can be concluded that, a sparker source with the center frequency of 1㎑ or higher can be applied to the multi-channel marine seismic survey, and the seismic section with high vertical resolution can be generated. The high-resolution seismic section would be very useful for subsurface geological structure analysis in the shallow sea.
김진후(Kim Jin-Hoo),박경원(Park Kyung-Won) 동아대학교 해양자원연구소 1998 동아대학교 해양자원연구소 연구논문집 Vol.11 No.-
An inverse vertical seismic profiling(Inverse VSP) was conducted on the site which consists mainly of 3 layes: thick alluvium layer on the top and weathered rock in the middle, and bed rock at the bottom. The technique uses a split spoon sampler as a downhole source and 24-channel geophone array as receiver. The filed data is compared with the synthetic seismogram in order to decide precise depth of reflections and interval velocity of each layer. The filed data is also compared with the borehole log to confirm accuracy of seismic data interpretation. From both comparison it can be concluded that if the site to be investigated consists of thick alluvium on the top, an inverse VSP technique offers precise depth determination of the bed rock.
김진후(Jin-Hoo Kim),김성보(Sung-Bo Kim),정철훈(Chul-Hoon Jeong) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
An SBP source wavelet acquisition system was devised and applied to the field work. The system consists of a wave source, a wavelet acquisition module, and a single channel streamer. The source wavelet was compared to the single channel seismic trace through cross correlation, semblance analysis, CWT based semblance analysis, and Hilbert transform based semblance analysis. The source wavelet acquired by the system can be used for further processing of seismic data such as deconvolution and removal of multiple signals appreared on the seismic section.