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Title: Experimental and numerical investigation of the temperature response to stress changes of rocks
Authors: Yang, Xiaoqiu
Lin, Weiren
Tadai, Osamu
Zeng, Xin
Yu, Chuanhai
Yeh, En-Chao
Li, Haibing
Wang, Huan
Author's alias: 林, 為人
Keywords: adiabatic pressure derivative
rock temperature response
stress change
hydrostatic compression
Longmenshan fault zone
Chelungpu fault zone
Issue Date: Jul-2017
Publisher: American Geophysical Union (AGU)
Journal title: Journal of Geophysical Research: Solid Earth
Volume: 122
Issue: 7
Start page: 5101
End page: 5117
Abstract: The temperature response to stress changes of rocks is key to understanding temperature anomalies in geoscience phenomena such as earthquakes. We developed a new hydrostatic compression system in which the rock specimen center can achieve adiabatic conditions during the first ~10 s following rapid loading or unloading and systematically measured several representative sedimentary, igneous, and metamorphic rocks sampled from two seismogenic zones (the Longmenshan Fault Zone in Sichuan and the Chelungpu Fault Zone (TCDP Hole-A) in Taiwan) and several quarries worldwide. We built a finite element model of heat conduction to confirm the measured results of temperature response to stress changes of rocks. The results show that (1) the adiabatic pressure derivative of the temperature (β) for most crustal rocks is ~1.5 mK/MPa to 6.2 mK/MPa, (2) the temperature response to stress of sedimentary rocks (~3.5–6.2 mK/MPa) is larger than that of igneous and metamorphic rocks (~2.5–3.2 mK/MPa), and (3) there is good linear correlation between β (in mK/MPa) and the bulk modulus K (in GPa): β = (−0.068K + 5.69) ± 0.4, R2 = 0.85. This empirical equation will be very useful for estimating the distribution of β in the crust, because K can be calculated when profiles of crustal density (ρ) and elastic wave velocities (Vp, Vs) are obtained from gravity surveys and seismic exploration.
Rights: ©2017. The Authors.
This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
URI: http://hdl.handle.net/2433/226955
DOI(Published Version): 10.1002/2016JB013645
Appears in Collections:Journal Articles

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