LEADER 03883nam 22005775 450 001 9910299385903321 005 20200703161150.0 010 $a981-10-8174-3 024 7 $a10.1007/978-981-10-8174-3 035 $a(CKB)4100000002485561 035 $a(MiAaPQ)EBC5309346 035 $a(DE-He213)978-981-10-8174-3 035 $a(PPN)224638645 035 $a(EXLCZ)994100000002485561 100 $a20180222d2018 u| 0 101 0 $aeng 135 $aurcnu|||||||| 181 $2rdacontent 182 $2rdamedia 183 $2rdacarrier 200 10$aFluid Distribution Along the Nankai-Trough Megathrust Fault off the Kii Peninsula $eInferred from Receiver Function Analysis /$fby Takeshi Akuhara 205 $a1st ed. 2018. 210 1$aSingapore :$cSpringer Singapore :$cImprint: Springer,$d2018. 215 $a1 online resource (105 pages) $cillustrations 225 1 $aSpringer Theses, Recognizing Outstanding Ph.D. Research,$x2190-5053 300 $a"Doctoral thesis accepted by The University of Tokyo, Tokyo, Japan." 311 $a981-10-8173-5 320 $aIncludes bibliographical references at the end of each chapters. 330 $aThis thesis explores fluid distribution along the Nankai-Trough megathrust fault around the Kii Peninsula of Japan, where devastating earthquakes are expected to occur in the near future. Exploring fluid distribution along subduction zones is an important issue because the fluid is considered to control the occurrence of earthquakes. One of the effective strategies to estimate fluid content is retrieving receiver functions (RFs) from seismograms, but in the case of ocean-bottom seismometers (OBSs), noisy P-wave reverberations within the seawater column make such an analysis difficult. The author therefore developed a novel technique to suppress the water reverberations, which allows obtaining the fluid distribution data along a wide depth range on the plate interface.   This thesis first presents the new technique, called the water layer filter method, and demonstrates its efficiency by using both synthetic and observation data. Then, using the method, a receiver function image of the Philippine Sea Plate is constructed to reveal dehydration processes of the subducting oceanic crust around the Kii Peninsula. Finally, the author performs high-frequency receiver function inversion analysis. The results indicate the presence of a thin fluid-rich sediment layer along the megathrust fault off the Kii Peninsula that acts as a pathway of fluid.     Nowadays, the number of offshore observations is increasing worldwide. In this respect, the attempt to better analyze OBS data employing the new method will become more important in future studies. 410 0$aSpringer Theses, Recognizing Outstanding Ph.D. Research,$x2190-5053 606 $aGeophysics 606 $aGeotechnical engineering 606 $aGeology, Structural 606 $aGeophysics/Geodesy$3https://scigraph.springernature.com/ontologies/product-market-codes/G18009 606 $aGeotechnical Engineering & Applied Earth Sciences$3https://scigraph.springernature.com/ontologies/product-market-codes/G37010 606 $aStructural Geology$3https://scigraph.springernature.com/ontologies/product-market-codes/G17040 615 0$aGeophysics. 615 0$aGeotechnical engineering. 615 0$aGeology, Structural. 615 14$aGeophysics/Geodesy. 615 24$aGeotechnical Engineering & Applied Earth Sciences. 615 24$aStructural Geology. 676 $a551.136 700 $aAkuhara$b Takeshi$4aut$4http://id.loc.gov/vocabulary/relators/aut$01059251 801 0$bMiAaPQ 801 1$bMiAaPQ 801 2$bMiAaPQ 906 $aBOOK 912 $a9910299385903321 996 $aFluid Distribution Along the Nankai-Trough Megathrust Fault off the Kii Peninsula$92504783 997 $aUNINA