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State of stress within a thin elastic wedge: a model of internal deformation of the continental plate at arc—arc junctions |
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| Authors: | Teruyuki Kato Kunihiko Shimazaki Ken'ichiro Yamashina |
| Institution: | Earthquake Research Institute, University of Tokyo, Tokyo, Japan (113) |
| Abstract: | Summary. Anomalous stress distributions near arc—arc junctions have been found in several parts of the world. As a simple two-dimensional model, a thin elastic wedge is introduced to model the continental side of the arc—arc junction, and the stress distribution within it is calculated to interpret those anomalies. Uniform normal and/or shear stress boundary conditions are given separately to each edge to approximate the effect of the two neighbouring converging plate boundaries; Stress components are obtained by numerical integration. Among the various results, the following features are predominant and seem to be actually taking place at arc—arc junctions. (1) The anomaly in stress pattern within the wedge is basically due to the difference in stress conditions between the two boundaries. (2) A large stress concentration takes place when symmetrical shear stresses are applied to the two edges. |
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