Japan Geoscience Union Meeting 2016

Presentation information


Symbol S (Solid Earth Sciences) » S-CG Complex & General

[S-CG58] Rheology, fracture and friction in Earth and planetary sciences

Sun. May 22, 2016 1:45 PM - 3:15 PM 303 (3F)

Convener:*Tomohiro Ohuchi(Geodynamics Research Center, Ehime University), Osamu Kuwano(Japan Agency for Marine-Earth Science and Technology), Ichiko Shimizu(Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo), Hidemi Ishibashi(Faculty of Science, Shizuoka University), Chair:Osamu Kuwano(Japan Agency for Marine-Earth Science and Technology)

2:45 PM - 3:00 PM

[SCG58-11] Estimating stress fieldfrom seismic moment tensor data based on the flow rule in plasticity theory

*Satoshi Matsumoto1 (1.Institute of Seismology and Volcanology, Faculty of Sciences, Kyushu University)

Keywords:seismic moment tensor, stress field

Stress field is a key factor controlling earthquake occurrence and crustal evolution. A method that slip data on many pre-existing faults reveals relative stress tensor in a region have been applied many regions. On the other hand difficulty of the method arises due to non-linear relation of slip vector to traction on a fault.
Here, we show stress field in a region with seismic activity can be estimated from sum of seismic moment tensors in the region based on classical equation in plasticity theory. Seismic activity is a phenomenon relaxing crustal stress and creates inelastic deformation in a medium due to faulting, which suggests the medium could behave as plastic body. The simple mathematical manipulation make easy to estimate stress field in a region and to develop inversion method in further studies.