Overview
- This is a prize winning thesis, nominated for Springer Theses by the University of Tokyo
- Provides a detailed description of a new method to overcome difficulties in using offshore seismic data
- Resolves the fine structure of the megathrust fault around the Kii Peninsula by receiver function analysis for the first time
- Presents useful suggestions for future studies to better understand megathrust faults using offshore data
Part of the book series: Springer Theses (Springer Theses)
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Table of contents (7 chapters)
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Front Matter
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Back Matter
Keywords
About this book
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 functionimage 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.
Authors and Affiliations
Bibliographic Information
Book Title: Fluid Distribution Along the Nankai-Trough Megathrust Fault off the Kii Peninsula
Book Subtitle: Inferred from Receiver Function Analysis
Authors: Takeshi Akuhara
Series Title: Springer Theses
DOI: https://doi.org/10.1007/978-981-10-8174-3
Publisher: Springer Singapore
eBook Packages: Earth and Environmental Science, Earth and Environmental Science (R0)
Copyright Information: Springer Nature Singapore Pte Ltd. 2018
Hardcover ISBN: 978-981-10-8173-6Published: 05 March 2018
Softcover ISBN: 978-981-13-4085-7Published: 22 December 2018
eBook ISBN: 978-981-10-8174-3Published: 22 February 2018
Series ISSN: 2190-5053
Series E-ISSN: 2190-5061
Edition Number: 1
Number of Pages: XVI, 94
Number of Illustrations: 5 b/w illustrations, 44 illustrations in colour
Topics: Geophysics/Geodesy, Geotechnical Engineering & Applied Earth Sciences, Structural Geology