On Averaging Interface Response During Dynamic Rupture and Energy Partitioning Diagrams for Earthquakes
On Averaging Interface Response During Dynamic Rupture and Energy Partitioning Diagrams for Earthquakes
复制标题
关于地震动态破裂期间界面响应的平均和能量分配图
DOI：
10.1115/1.4005964
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
N. Lapusta
中科院分区：
文献类型：
--
作者：
H. Noda;N. Lapusta
地震以动态剪切裂纹的形式发生，并将部分弹性应变能转化为辐射能和耗散能。控制这一过程的剪切强度的局部演化在空间和时间上是可变的，可以从实验室实验和破裂模型中进行研究。与此同时，对辐射能量和其他数量的越来越精确的测量以破裂平均的方式表征地震。在这里，我们提出和研究两种方法来平均动态破裂过程中的摩擦耗散。第一种是基于耗散的实际进展，但相关的平均剪应力并不反映局部摩擦行为。第二个构造，以保持当地的应力-滑移响应的主要特征，并在所研究的例子中表现良好。所开发的方法应该是有用的可视化的动态模型中的能量分区，并将它们连接到观察使用的图表，反映当地的应力演化的主导特征。
Earthquakes occur as dynamic shear cracks and convert part of the elastic strain energy into radiated and dissipated energy. Local evolution of shear strength that governs this process, which is variable in space and time, can be studied from laboratory experiments and rupture models. At the same time, increasingly accurate measurements of radiated energy and other quantities characterize earthquakes in a rupture-averaged way. Here, we present and study two approaches to averaging frictional dissipation during dynamic rupture. The first one is based on the actual progression of dissipation, but the associated averaged shear stress does not reflect the local friction behavior. The second one is constructed to preserve prevailing features of local stress-slip response and performs well in the examples studied. The developed approach should be useful for visualizing energy partitioning in dynamic models and linking them to observations using diagrams that reflect dominant features of local stress evolution.