03883nam 22005775 450 991029938590332120200703161150.0981-10-8174-310.1007/978-981-10-8174-3(CKB)4100000002485561(MiAaPQ)EBC5309346(DE-He213)978-981-10-8174-3(PPN)224638645(EXLCZ)99410000000248556120180222d2018 u| 0engurcnu||||||||rdacontentrdamediardacarrierFluid Distribution Along the Nankai-Trough Megathrust Fault off the Kii Peninsula Inferred from Receiver Function Analysis /by Takeshi Akuhara1st ed. 2018.Singapore :Springer Singapore :Imprint: Springer,2018.1 online resource (105 pages) illustrationsSpringer Theses, Recognizing Outstanding Ph.D. Research,2190-5053"Doctoral thesis accepted by The University of Tokyo, Tokyo, Japan."981-10-8173-5 Includes bibliographical references at the end of each chapters.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.Springer Theses, Recognizing Outstanding Ph.D. Research,2190-5053GeophysicsGeotechnical engineeringGeology, StructuralGeophysics/Geodesyhttps://scigraph.springernature.com/ontologies/product-market-codes/G18009Geotechnical Engineering & Applied Earth Scienceshttps://scigraph.springernature.com/ontologies/product-market-codes/G37010Structural Geologyhttps://scigraph.springernature.com/ontologies/product-market-codes/G17040Geophysics.Geotechnical engineering.Geology, Structural.Geophysics/Geodesy.Geotechnical Engineering & Applied Earth Sciences.Structural Geology.551.136Akuhara Takeshiauthttp://id.loc.gov/vocabulary/relators/aut1059251MiAaPQMiAaPQMiAaPQBOOK9910299385903321Fluid Distribution Along the Nankai-Trough Megathrust Fault off the Kii Peninsula2504783UNINA