震后短期和长期形变模拟以1960年智利M_W9.5地震为例

• 作 者: 邵志刚 傅容珊 薛霆虓 查显杰
• 机 构: 中国科学院壳幔物质与环境重点实验室,中国科学技术大学地球与空间科学学院,
• 出 处: 地震学报
• 发表日期: 2008年04期
• 关键词: 智利地震 震后形变 Burgers体 瓦尔迪维亚 粘弹介质 短期 Burgers M_W9.5 有限元 形变

以1960年5月智利瓦尔迪维亚(Valdivia)MW9.5地震为例分析震后不同时期的形变,实现了以Burgers体为粘弹介质模型来模拟震后粘弹松弛效应有限元数值模拟.计算结果表明,该粘弹介质模型可以模拟地震引起的瞬时同震弹性响应及震后粘弹松弛的短期和长期响应.由1960智利MW9.5地震震后模拟的应变率显示以Burgers体为粘弹介质模型可以解决Maxwell体在模拟震后短期和长期形变不协调问题.

Taking the Val9.0 Earthquake in Valdivia, Chile, May, 1960, as an example, the deformation in different periods after the earthquake was analyzed. The finite element numerical simulation of the viscoelastic relaxation after the earthquake was simulated using the Burgers body as the viscoelastic medium model. The calculated results show that the viscoelastic medium model can simulate the short-term and long-term responses of instantaneous coseismic elastic response and post-earthquake viscoelastic relaxation induced by earthquakes.The simulated strain rate after the earthquake in 1960 in Chile MW9.5 shows that the Burgers body is sticky The elastic media model can solve the problem of Maxwell body’s short-term and long-term deformation inconsistency after simulated earthquakes.