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| | Abstract | | The estimation of oceanic crust structure is required to reveal the tectonic history of Japanese island arcs and to estimate the limit of legal continental shelf. Refraction or reflection wave exploration is one of the methods for deep oceanic crust investigation, but in these methods mainly used is only compressional wave or the vertical component of seismograms. Hence, it is necessary to use shear wave or horizontal component of seismograms for more precise investigation to estimate the thickness of oceanic crust. Receiver function is a decomposed wave form to estimate the interface of velocity change using shear wave from earthquake without artificial sources. This study tries to apply receiver function analysis to the investigation using refraction wave not from earthquake but artificial sources on the sea surface. However, the result of receiver function analysis using artificial sources is different from that using earthquake. Time migration was applied to refracted wave and can move a converted point to the true point. The F-K migration is also conducted to time migrated receiver function for getting depth imaging, and stacking with the imaging using earthquake can improve the accuracy of imaging. These numerical processes can provide true depth structures using the horizontal component of refraction wave data. |
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