2012年11月6日加拿大地质调查局Dr. Kelin Wang学术报告通知

2012年11月6日加拿大地质调查局Dr. Kelin Wang学术报告通知

题目：Deformation cycles of great subduction earthquakes and mantle rheology
报告人：Dr. Kelin Wang
报告地点：海洋楼215会议室
报告时间：2012年11月6日（周二）下午3:30-5:00
联系人：李春峰教授

报告人简介：
Kelin Wang obtained his BSc in geology at the Peking (Beijing) University in 1982 and PhD in geophysics from the University of Ontario in 1989. He is now a senior Research Scientist with the Geological Survey of Canada.
Most of his recent work is on geodynamics of subduction zones, but he has also been working on thermal, mechanical, and hydrogeological processes in Earth's crust in general. He is particularly interested in exploring how different components of the subduction zone affect one another, addressing questions like how mantle flow and slab metamorphism affect earthquake generation and arc volcanism, how stresses and stress changes along subduction faults affect forearc stress and deformation, and how sediment accretion at the trench is related to great earthquakes, etc.
His other academic activities include supervising students through a joint professor appointment at the University of Victoria, being an Associate Editor of Journal of Geophysical Research, serving on the editorial boards of Journal of Geodynamics, Science in China (Earth Science), and Earthquake Science, and participating in a number of international projects. He was formerly the Secretary of the Canadian Geophysical Union and Chair of the International Professionals for the Advancement of Chinese Earth Sciences.
报告内容简介：
Geodetic observations of crustal deformation provide important information on the physical processes of subduction earthquakes and mantle rock deformation. However, investigations of full cycles of large subduction earthquakes, typically decades or centuries long, are hampered by the short time span of quality geodetic observations. We demonstrate that insights can be gained by using numerical models to link together geodetic “snapshots” of margins that are presently at different stages of their earthquake cycles. For giant events (M > 9), decadal to century- scale earthquake-cycle deformation is well described by the "steady-state" Maxwell viscoelastic rheology, but short-term post-seismic deformation requires both afterslip of the subduction fault and transient rheology of the mantle material. The duration of postseismic viscoelastic stress relaxation scales with earthquake size, so that the evolution of deformation following smaller earthquakes is much faster.
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