简单断层带上缓慢应力累积及松弛过程的有限单元模拟

• 作 者: 王启鸣 Nafi M.Toksz
• 机 构: 国家地震局地质研究所,美国麻省理工学院
• 出 处: 地震地质
• 发表日期: 1983年03期
• 关键词: 断层带 粘弹性模型 闭锁带 转换断层 单元模拟 应力松弛 松弛过程 应力计算 临界状态 围空

分别用三维有限元弹性及粘弹性模型计算板块间相对运动在转换断层闭锁带上的应力累积及软水圈和断层深部低粘度物质产生的大震后应力松弛,从而给出断层带上应力变化过程。 本文以土耳其北部北安纳托里亚断层带为模型。计算结果表明,西部“围空区”有最高剪切应力水平并已达到临界状态,今后几年若无小震或蠕变将会有较大地震;断层带的下一个活动期将从公元2000—2020年开始。

The three-dimensional finite element elastic and viscoelastic models were used to calculate the stress accumulation on the closure zone of the transitional fault zone and the stress relaxation after the soft water circle and the large-scale low-viscous material produced by the fault, so as to give the stress variation process in the fault zone . This paper takes the Northern Anatolian fault zone in northern Turkey as a model. The results show that there is the highest shear stress level in the “confined area” in the west and has reached the critical state. In the next few years, there will be a large earthquake without any small earthquake or creep. The next active period of the fault zone will change from 2000 Beginning in 2020.