Thermal pressurization and slip-weakening distance of a fault: An example of the Hanaore fault, southwest Japan
Thermal pressurization and slip-weakening distance of a fault: An example of the Hanaore fault, southwest Japan
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DOI：
10.1785/0120040089
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发表时间：
2005-08-01
影响因子：
3
通讯作者：
Shimamoto, T
中科院分区：
文献类型：
--
作者：
Noda, H;Shimamoto, T
在过去的十年中，一个争议是实验室测量值和地震估计值之间的滑移弱化距离D-c存在很大差异。根据对日本花入断裂带的实测输运性质，对热加压过程进行了数值分析，结果表明，该过程对该断裂带是有效的，当变形带宽度小于10-20 mm时，D-c值为几分米到1 in左右，与地震测定的D-c值完全相同，所以热增压可以成为解决D-c悖论的一种机制。热加压过程有效地降低了产热率。而这个断层带的温度预计最多上升600摄氏度左右，这个温度还不足以融化岩石。
A controversy over the last decade is the large difference in the slip-weakening distance, D-c, between laboratory-measured and seismically estimated values. Our numerical analyses of the thermal pressurization process, based on measured transport properties of the Hanaore fault zone in Japan, reveal that the process is effective for this fault and that D-c becomes of the order of several decimeters to about I in when the width of the deformation zone is less than 10-20 mm. This D-c value is of exactly the same order as that determined seismically, so thermal pressurization can be a mechanism for solving the D-c paradox. The thermal pressurization process effectively reduces the heat production rate. and the temperature rise expected for this fault zone is at most about 600 degrees C, which is not high enough a temperature to melt rocks.