Electric currents streaming out of stressed igneous rocks - A step towards understanding pre-earthquake low frequency EM emissions
Electric currents streaming out of stressed igneous rocks - A step towards understanding pre-earthquake low frequency EM emissions
复制标题
DOI：
10.1016/j.pce.2006.02.027
复制
发表时间：
2006-01-01
影响因子：
3.7
通讯作者：
Lau, Bobby W. S.
中科院分区：
文献类型：
--
作者：
Freund, Friedemann T.;Takeuchi, Akihiro;Lau, Bobby W. S.
地壳中流动的瞬变电流对于解释许多非地震的地震前信号，特别是低频电磁辐射是必要的。我们证明，当我们对一块火成岩的一端施加应力时，两股电流从受力的岩石体积中流出。其中一个电流是由电子携带的，它通过直接连接到应力岩石体积的铜电极流出。另一种电流由p空穴携带，即氧离子亚晶格上的缺陷电子，它流出至少imm的未受应力的岩石，与通过外部电路到达的电子相遇。这两个流出电流是电池电流的一部分。它们通过各自的电场相互耦合并起伏不定。将从这些实验室实验中获得的洞察力应用到野外，那里的大量岩石必须受到不断增加的应力，这导致我们认为，在大地震之前，地壳中会形成相当大规模的瞬变、波动电流。(C)2006爱思唯尔有限公司。保留所有权利。
Transient electric currents that flow in the Earth's crust are necessary to account for many non-seismic pre-earthquake signals, in particular for low frequency electromagnetic (EM) emissions. We show that, when we apply stresses to one end of a block of igneous rocks, two currents flow out of the stressed rock volume. One current is carried by electrons and it flows out through a Cu electrode directly attached to the stressed rock volume. The other current is carried by p-holes, i.e., defect electrons on the oxygen anion sublattice, and it flows out through at least I m of unstressed rock to meet the electrons that arrive through the outer electric circuit. The two outflow currents are part of a battery current. They are coupled via their respective electric fields and fluctuate. Applying the insight gained from these laboratory experiments to the field, where large volume of rocks must be subjected to ever increasing stress, leads us to suggest transient, fluctuating currents of considerable magnitude that would build up in the Earth's crust prior to major earthquakes. (c) 2006 Elsevier Ltd. All rights reserved.