TY - BOOK ID - 32841684 TI - Fluid Distribution Along the Nankai-Trough Megathrust Fault off the Kii Peninsula : Inferred from Receiver Function Analysis PY - 2018 SN - 9811081743 9811081735 PB - Singapore : Springer Singapore : Imprint: Springer, DB - UniCat KW - Thrust faults (Geology) KW - Earth sciences. KW - Structural geology. KW - Geophysics. KW - Geotechnical engineering. KW - Earth Sciences. KW - Geophysics/Geodesy. KW - Geotechnical Engineering & Applied Earth Sciences. KW - Structural Geology. KW - Overthrusts (Geology) KW - Reverse faults (Geology) KW - Thrusts (Geology) KW - Faults (Geology) KW - Physical geography. KW - Geology, Structural. KW - Geotectonics KW - Structural geology KW - Tectonics (Geology) KW - Physical geology KW - Geography KW - Engineering, Geotechnical KW - Geotechnics KW - Geotechnology KW - Engineering geology KW - Geological physics KW - Terrestrial physics KW - Earth sciences KW - Physics UR - https://www.unicat.be/uniCat?func=search&query=sysid:32841684 AB - This thesis explores fluid distribution along the Nankai-Trough megathrust fault around the Kii Peninsula of Japan, where devastating earthquakes are expected to occur in the near future. Exploring fluid distribution along subduction zones is an important issue because the fluid is considered to control the occurrence of earthquakes. One of the effective strategies to estimate fluid content is retrieving receiver functions (RFs) from seismograms, but in the case of ocean-bottom seismometers (OBSs), noisy P-wave reverberations within the seawater column make such an analysis difficult. The author therefore developed a novel technique to suppress the water reverberations, which allows obtaining the fluid distribution data along a wide depth range on the plate interface. This thesis first presents the new technique, called the water layer filter method, and demonstrates its efficiency by using both synthetic and observation data. Then, using the method, a receiver function image of the Philippine Sea Plate is constructed to reveal dehydration processes of the subducting oceanic crust around the Kii Peninsula. Finally, the author performs high-frequency receiver function inversion analysis. The results indicate the presence of a thin fluid-rich sediment layer along the megathrust fault off the Kii Peninsula that acts as a pathway of fluid. Nowadays, the number of offshore observations is increasing worldwide. In this respect, the attempt to better analyze OBS data employing the new method will become more important in future studies. ER -