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특별호 논문 : 해양 물리탐사 ; OBS/에어건을 이용한 지각구조 연구에서 불균질층의 영향에 대한 평가와 해석
( Kayoko Tsuruga ),( Junzo Kasahara ),( Ryuji Kubota ),( Eiichiro Nishiyama ),( Aya Kamimura ),( Yoshihiro Naito ),( Fuminori Honda ),( Nobutaka Oikawa ),( Yasuo Tamura ),( Azusa Nishizawa ),( Kentaro 한국지구물리·물리탐사학회 2008 지구물리와 물리탐사 Vol.11 No.1
학아가벌자,립원순삼,구보전륭이,서산영일랑,상촌채,내등호유,본전사기,급천신효,전촌팔주부,김전겸태랑,Tsuruga, Kayoko,Kasahara, Junzo,Kubota, Ryuji,Nishiyama, Eiichiro,Kamimura, Aya,Naito, Yoshihiro,Honda, Fuminori,Oikawa, Nobutaka,Tamura, Yasuo,Ni Korean Society of Earth and Exploration Geophysici 2008 지구물리와 물리탐사 Vol.11 No.1
We present a method for interpreting seismic records with arrivals and waveforms having characteristics which could be generated by extremely inhomogeneous velocity structures, such as non-typical oceanic crust, decollement at subduction zones, and seamounts in oceanic regions, by comparing them with synthetic waveforms. Recent extensive refraction and wide-angle reflection surveys in oceanic regions have provided us with a huge number of high-resolution and high-quality seismic records containing characteristic arrivals and waveforms, besides first arrivals and major reflected phases such as PmP. Some characteristic waveforms, with significant later reflected phases or anomalous amplitude decay with offset distance, are difficult to interpret using only a conventional interpretation method such as the traveltime tomographic inversion method. We find the best process for investigating such characteristic phases is to use an interactive interpretation method to compare observed data with synthetic waveforms, and calculate raypaths and traveltimes. This approach enables us to construct a reasonable structural model that includes all of the major characteristics of the observed waveforms. We present results here with some actual observed examples that might be of great help in the interpretation of such problematic phases. Our approach to the analysis of waveform characteristics is endorsed as an innovative method for constructing high-resolution and high-quality crustal structure models, not only in oceanic regions, but also in the continental regions.