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Fluid Distribution Along the Nankai-Trough Megathrust Fault off the Kii Peninsula - Inferred from Receiver Function Analysis (Hardcover, 1st ed. 2018)
Loot Price: R2,113
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Fluid Distribution Along the Nankai-Trough Megathrust Fault off the Kii Peninsula - Inferred from Receiver Function Analysis (Hardcover, 1st ed. 2018)
Series: Springer Theses
Expected to ship within 10 - 15 working days
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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.
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