Journal
TECTONOPHYSICS
Volume 478, Issue 3-4, Pages 215-220Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.tecto.2009.08.001
Keywords
Megasplay fault; Tonankai earthquake; Frictional heat; Thermal diffusion; Slip rate
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Funding
- Center for Advanced Marine Core Research, Kochi University
- Japan Society for the Promotion of Science [21740329]
- Grants-in-Aid for Scientific Research [21740329] Funding Source: KAKEN
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A megasplay fault branching from the subduction boundary megathrust in the Nankai Trough is thought to have caused large tsunamis associated with past Tonankai earthquakes. Because the temperature recorded in the fault can constrain parameters of seismic slip, we evaluated several temperature proxies (fluid-mobile trace element concentrations, Sr isotopes, magnetic minerals, inorganic carbon content, and Raman spectra of carbonaceous material) in material from a localized slip zone, sampled at Site C0004 by Integrated Ocean Drilling Program Expedition 316. Our results showed that the shallow part of the megasplay fault has not experienced temperatures above 300 degrees C. We also found that in addition to shear stress and slip distance, slip rate and porosity are effective parameters for frictional heat, as demonstrated by numerical analysis incorporating thermal diffusion. The slip rate estimated through these proxies may indicate that the fault did not slip with high velocity near the seafloor. (C) 2009 Elsevier B.V. All rights reserved.
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