Dynamic seismic ruptures on melting fault zones
Dynamic seismic ruptures on melting fault zones
复制标题
熔融断层带的动态地震破裂
DOI：
10.1029/2010jb007724
复制
发表时间：
2011
影响因子：
--
通讯作者：
A. Bizzarri
中科院分区：
文献类型：
--
作者：
A. Bizzarri
[1]我们提出了一个物理模型，描述了自发地震破裂的行为动态传播的断层带，并占存在的摩擦熔化产生的滑动面。首先，我们解析推导出熔体层内的温度演化的解决方案，它概括了以前的近似。然后，我们将这样的解决方案的弹性动力学问题的解决方案的数值代码。当熔融层形成时，线性滑动弱化定律（最初控制断层并依赖于库仑摩擦）不再有效。因此，我们在断层上引入了线性粘性流变学，具有随温度变化的动态粘度。通过数值模拟，我们探索了从库仑摩擦和粘性流变过渡之前和之后的粘性区中的牵引演化的结果行为。我们的模型的预测是在一般情况下，从折返断层的数据。我们还发现，故障后，经历了由滑移弱化本构方程控制的破裂应力下降，经历了第二次牵引下降控制的指数衰减的故障电阻由于粘性流变。这种进一步的下降增强了断层的不稳定性，增加了断裂速度、断层滑动速度的峰值和断裂能量密度。
[1] We present a physical model that describes the behavior of spontaneous earthquake ruptures dynamically propagating on a fault zone and that accounts for the presence of frictional melt produced by the sliding surfaces. First, we analytically derive the solution for the temperature evolution inside the melt layer, which generalizes previous approximations. Then we incorporate such a solution into a numerical code for the solution of the elastodynamic problem. When a melt layer is formed, the linear slip-weakening law (initially governing the fault and relying on the Coulomb friction) is no longer valid. Therefore we introduce on the fault a linearly viscous rheology, with a temperature-dependent dynamic viscosity. We explore through numerical simulations the resulting behavior of the traction evolution in the cohesive zone before and after the transition from Coulomb friction and viscous rheology. The predictions of our model are in general agreement with the data from exhumed faults. We also find that the fault, after undergoing the breakdown stress drop controlled by the slip-weakening constitutive equation, experiences a second traction drop controlled by the exponential weakening of fault resistance due to the viscous rheology. This further drop enhances the instability of the fault, increasing the rupture speeds, the peaks in fault slip velocity, and the fracture energy density.
2007：将高速岩石摩擦实验与熔体存在下的同震滑移联系起来
DOI：
--
发表时间：
2007
期刊：
Geophysical Monograph, Am. Geophys. Union 170, "Earthquakes : Radiated Energy and the Physics of Faulting"
影响因子：
--
作者：
Di;Toro;G.;Hirose;T.;Nielsen;S.;Shimamoto;T
通讯作者：
T
2008，摩擦熔融与地震滑移
DOI：
--
发表时间：
2008
期刊：
Jour. Geophys. Res 113
影响因子：
--
作者：
Nielsen;S.;Di;Toro;G.;Hirose;T.;Shimamoto;T
通讯作者：
T
影响因子：
3.9
作者：
Otsuki, K;Monzawa, N;Nagase, T
通讯作者：
Nagase, T