Ultralow friction of carbonate faults caused by thermal decomposition
Ultralow friction of carbonate faults caused by thermal decomposition
复制标题
DOI：
10.1126/science.1139763
复制
发表时间：
2007-05-11
期刊：
影响因子：
56.9
通讯作者：
Ando, Jun-ichi
中科院分区：
文献类型：
--
作者：
Han, Raehee;Shimamoto, Toshihiko;Ando, Jun-ichi
断层的高速弱化可能在大地震期间驱动断层运动。模拟故障在卡拉拉大理石在滑动速率高达1.3米每秒的实验表明，方解石的热分解，由于摩擦加热诱导明显的故障弱化与稳态摩擦系数低至0.06。分解产生几十纳米大小的颗粒，超低摩擦似乎与超细分解产物的瞬间加热有关。因此，热分解可能是断层动态弱化的一个重要过程。
High-velocity weakening of faults may drive fault motion during large earthquakes. Experiments on simulated faults in Carrara marble at slip rates up to 1.3 meters per second demonstrate that thermal decomposition of calcite due to frictional heating induces pronounced fault weakening with steady-state friction coefficients as low as 0.06. Decomposition produces particles of tens of nanometers in size, and the ultralow friction appears to be associated with the flash heating on an ultrafine decomposition product. Thus, thermal decomposition may be an important process for the dynamic weakening of faults.