Departament d'Estructura i Constituents de la Matèria, Facultat de Física, Universitat de Barcelona, Martí i Franquès 1, E-08028 Barcelona, Catalonia, Spain.
Phys Rev Lett. 2013 Feb 22;110(8):088702. doi: 10.1103/PhysRevLett.110.088702. Epub 2013 Feb 19.
It has long been stated that there are profound analogies between fracture experiments and earthquakes; however, few works attempt a complete characterization of the parallels between these so separate phenomena. We study the acoustic emission events produced during the compression of Vycor (SiO(2)). The Gutenberg-Richter law, the modified Omori's law, and the law of aftershock productivity hold for a minimum of 5 decades, are independent of the compression rate, and keep stationary for all the duration of the experiments. The waiting-time distribution fulfills a unified scaling law with a power-law exponent close to 2.45 for long times, which is explained in terms of the temporal variations of the activity rate.
长期以来，人们一直认为骨折实验与地震之间存在着深刻的类比；然而，很少有研究试图全面描述这两种截然不同的现象之间的相似之处。我们研究了在压缩 Vycor（SiO(2)）过程中产生的声发射事件。古登堡-里希特定律、修正后的奥姆里定律和余震生产力定律至少适用 5 个数量级，与压缩速率无关，并且在实验的所有持续时间内保持稳定。等待时间分布满足统一的标度律，在长时间内具有接近 2.45 的幂律指数，这可以用活性率的时间变化来解释。
