Method for estimating the stress field from seismic moment tensor data based on the flow rule in plasticity theory

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• 作者：S. Matsumoto
• 刊名：Geophysical Research Letters
• 出版年：2016
• 出版时间：16 September 2016
• 年：2016
• 卷：43
• 期：17
• 页码：8928-8935
• 全文大小：2.4MB
• ISSN：1944-8007

文摘

The stress field is a key factor controlling earthquake occurrence and crustal evolution. In this study, we propose an approach for determining the stress field in a region using seismic moment tensors, based on the classical equation in plasticity theory. Seismic activity is a phenomenon that relaxes crustal stress and creates plastic strain in a medium because of faulting, which suggests that the medium could behave as a plastic body. Using the constitutive relation in plastic theory, the increment of the plastic strain tensor is proportional to the deviatoric stress tensor. Simple mathematical manipulation enables the development of an inversion method for estimating the stress field in a region. The method is tested on shallow earthquakes occurring on Kyushu Island, Japan.