Abstract
The study of fluid distribution along megathrust faults at subduction zones is important because such fluid controls the slip behavior of the megathrust faults. A number of studies have directed their efforts toward understanding the fluid distribution, exploiting both active- and passive-source seismic surveys. Receiver function (RF) analysis is a powerful method for this purpose. The method aims to extract P-to-S conversion phases from seismograms, which are useful for constraining physical properties along subsurface discontinuities such as subducting plate interfaces. While megathrust faults are located beneath offshore regions, RF analysis has hardly been applied to data recorded by ocean-bottom seismometers (OBSs) because seismograms recorded at offshore observatories are dominated by water reverberations. This thesis develops a new technique for solving this problem and then uses the technique to reveal the subsurface structure and fluid distribution along the megathrust fault off the Kii Peninsula, southwestern Japan. This chapter provides the background to this study, the tectonic setting of the study area, and descriptions of the data used in this thesis.
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Akuhara, T. (2018). General Introduction. In: Fluid Distribution Along the Nankai-Trough Megathrust Fault off the Kii Peninsula. Springer Theses. Springer, Singapore. https://doi.org/10.1007/978-981-10-8174-3_1
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DOI: https://doi.org/10.1007/978-981-10-8174-3_1
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