Acquisition, processing and interpretation of high-resolution seismic data using a small-scale multi-channel system: an example from the Korea Strait inner shelf, south-east Korea
作者： Dong-Geun Yoo , Nam-Hyung Koo , Ho-Young Lee , Byoung-Yeop Kim , Young-Jun Kim
DOI: 10.1071/EG15081
关键词: Paleontology 、 Sea level 、 Sedimentary rock 、 Geology 、 Transgressive 、 Multi channel 、 Data processing 、 Marine transgression 、 Glacial period 、 Geophysics 、 Personal computer
摘要: A high-resolution seismic survey was designed to improve the quality of data and study evolution inner shelf deposits off southern coast Korea. 0.5L air gun 6- or 8-channel streamer cable with a 5m group interval were used as source receiver system, respectively. Data recording digitally performed at shot 2s sample 0.1ms using personal computer (PC)-based system an analogue digital (A/D) converter. In processing, deconvolution static corrections very effective for improving resolution. The resolution signal-to-noise (S/N) ratio improved by multi-channel systemsasopposedtoasingle-channelanaloguestreamer.Theresultsshowthatasmall-scalemulti-channelseismicsystemis aneffectivewaytoinvestigatelateQuaternarydeposits.Seismicstratigraphicanalysisofthehigh-resolutionseismicprofiles revealed that deposits, up 30m thick, consist three sedimentary units, which comprise transgressive highstand systems tracts deposited after last glacial period. tract includes two units (I II) separated ravinement surface (RS). lower Unit I, lying below RS, consists estuarine sediments left behind byshorefaceerosionduringtransgression,andrepresentsaparaliccomponent.TheupperUnitII,includingtwosub-units(IIa IIb), lies above RS sand produced shoreface erosion during landward transgression, corresponds marine component. uppermost III maximum flooding thick mud clinoforms modern Nakdong Seomjin subaqueous deltas. This unit likely formed recent sea level represents tract.
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