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000826453 0247_ $$a10.1007/978-981-10-8174-3$$2doi
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000826453 1001_ $$aAkuhara, Takeshi,$$eauthor.
000826453 24510 $$aFluid distribution along the Nankai-Trough megathrust fault off the Kii Peninsula :$$binferred from receiver function analysis /$$cTakeshi Akuhara.
000826453 264_1 $$aSingapore :$$bSpringer,$$c2018.
000826453 300__ $$a1 online resource :$$billustrations.
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000826453 4901_ $$aSpringer theses
000826453 500__ $$a"Doctoral thesis accepted by The University of Tokyo, Tokyo, Japan."
000826453 504__ $$aIncludes bibliographical references.
000826453 506__ $$aAccess limited to authorized users.
000826453 520__ $$aThis thesis explores fluid distribution along the Nankai-Trough megathrust fault around the Kii Peninsula of Japan, where devastating earthquakes are expected to occur in the near future. Exploring fluid distribution along subduction zones is an important issue because the fluid is considered to control the occurrence of earthquakes. One of the effective strategies to estimate fluid content is retrieving receiver functions (RFs) from seismograms, but in the case of ocean-bottom seismometers (OBSs), noisy P-wave reverberations within the seawater column make such an analysis difficult. The author therefore developed a novel technique to suppress the water reverberations, which allows obtaining the fluid distribution data along a wide depth range on the plate interface.   This thesis first presents the new technique, called the water layer filter method, and demonstrates its efficiency by using both synthetic and observation data. Then, using the method, a receiver function image of the Philippine Sea Plate is constructed to reveal dehydration processes of the subducting oceanic crust around the Kii Peninsula. Finally, the author performs high-frequency receiver function inversion analysis. The results indicate the presence of a thin fluid-rich sediment layer along the megathrust fault off the Kii Peninsula that acts as a pathway of fluid.   Nowadays, the number of offshore observations is increasing worldwide. In this respect, the attempt to better analyze OBS data employing the new method will become more important in future studies.
000826453 588__ $$aOnline resource; title from PDF title page (SpringerLink, viewed February 27, 2018).
000826453 650_0 $$aThrust faults (Geology)$$zJapan.
000826453 77608 $$iPrint version: $$z9811081735$$z9789811081736$$w(OCoLC)1017848392
000826453 830_0 $$aSpringer theses.
000826453 852__ $$bebk
000826453 85640 $$3SpringerLink$$uhttps://univsouthin.idm.oclc.org/login?url=http://link.springer.com/10.1007/978-981-10-8174-3$$zOnline Access$$91397441.1
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