Fluid Distribution Along the Nankai-Trough Megathrust Fault off the Kii Peninsula

Inferred from Receiver Function Analysis

Nonfiction, Science & Nature, Science, Earth Sciences, Geophysics
Cover of the book Fluid Distribution Along the Nankai-Trough Megathrust Fault off the Kii Peninsula by Takeshi Akuhara, Springer Singapore
View on Amazon View on AbeBooks View on Kobo View on B.Depository View on eBay View on Walmart
Author: Takeshi Akuhara ISBN: 9789811081743
Publisher: Springer Singapore Publication: February 22, 2018
Imprint: Springer Language: English
Author: Takeshi Akuhara
ISBN: 9789811081743
Publisher: Springer Singapore
Publication: February 22, 2018
Imprint: Springer
Language: English

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.

View on Amazon View on AbeBooks View on Kobo View on B.Depository View on eBay View on Walmart

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.

More books from Springer Singapore

Cover of the book Innovative Diagnostics and Treatment: Nanorobotics and Stem Cells by Takeshi Akuhara
Cover of the book Changing Trends in Japan's Employment and Leisure Activities by Takeshi Akuhara
Cover of the book Neutronics of Advanced Nuclear Systems by Takeshi Akuhara
Cover of the book When role-play comes alive by Takeshi Akuhara
Cover of the book Diabetes and Aging-related Complications by Takeshi Akuhara
Cover of the book Ultrathin Carbon-Based Overcoats for Extremely High Density Magnetic Recording by Takeshi Akuhara
Cover of the book Precision Medicine Powered by pHealth and Connected Health by Takeshi Akuhara
Cover of the book Two Decades of Basic Education in Rural China by Takeshi Akuhara
Cover of the book Recent Trends in Signal and Image Processing by Takeshi Akuhara
Cover of the book Risk Based Technologies by Takeshi Akuhara
Cover of the book Large Dams by Takeshi Akuhara
Cover of the book Study on Hydrodynamic Characteristics of the Raft-type Wave-Powered Desalination Device by Takeshi Akuhara
Cover of the book Understanding China's Overcapacity by Takeshi Akuhara
Cover of the book System Dynamics by Takeshi Akuhara
Cover of the book Social Media and Civil Society in Japan by Takeshi Akuhara
We use our own "cookies" and third party cookies to improve services and to see statistical information. By using this website, you agree to our Privacy Policy