Estimation of temperature rise in a shallow slip zone of the megasplay fault in the Nankai Trough

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doi: 10.1016/j.tecto.2009.08.001
Author(s): Hirono, T.; Ujiie, K.; Ishikawa, T.; Mishima, T.; Hamada, Y.; Tanimizu, M.; Soh, W.; Kinoshita, M.
Author Affiliation(s): Primary:
Osaka University, Department of Earth and Space Science, Toyonaka, Japan
Japan Agency for Marine-Earth Science and Technology, Japan
Kochi Institute for Core Sample Research, Japan
Kobe University, Japan
Volume Title: Tectonophysics
Source: Tectonophysics, 478(3-4), p.215-220. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0040-1951 CODEN: TCTOAM
Note: In English
Summary: 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°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. Abstract Copyright (2009) Elsevier, B.V.
Year of Publication: 2009
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 16 Structural Geology; Active faults; Alkaline earth metals; Asia; Boundary faults; Carbon; Chemical composition; Earthquakes; Expedition 316; Far East; Faults; Fluid phase; Geochemistry; Geologic hazards; Heating; Honshu; IODP Site C0004; Integrated Ocean Drilling Program; Isotope ratios; Isotopes; Japan; Kii Peninsula; Metals; Mobilization; Nankai Trough; North Pacific; Northwest Pacific; Pacific Ocean; Raman spectra; Slip rates; Spectra; Splay faults; Sr-87/Sr-86; Stable isotopes; Strontium; Temperature; Thermal diffusivity; Thrust faults; Tonankai Japan; Tonankai earthquake 1944; Tsunamis; West Pacific
Coordinates: N331300 N331300 E1364300 E1364300
Record ID: 2010038741
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands