Aspects of modelling the tectonics of large volcanoes on the terrestrial planets

摘要: Analytic solutions for the responses of planetary lithospheres to volcanic loads have been used model faulting and infer elastic plate thicknesses. Predictions distribution around loads, based on application Anderson's criteria results models, do not agree well with observations. Such models give stress state in load itself, but only suggest a horizontal compressive there. Further, these considered effect an instantaneously emplaced load. They address time evolution stresses, nor they consider which grows. A finite element approach allows us assign elements thus permits calculation history within edifice. The effects episodic growth can also be treated. When are included, much better agreement We use code TECTON construct axisymmetric volcanoes resting lithospheric overlying viscoelastic asthenosphere. implemented time-dependent material properties order simulate incremental volcano growth. layer was taken extend sufficient depth so that rigid lower boundary has no significant influence results. first calculates deformations stresses then determines viscous stresses. Time scales as Maxwell tau(m) 25 km height 200 radius lithosphere 40 thick (parameters approximately appropriate Ascraeus Mons). consists three increments applied at intervals 1000 tau(m). Contours maximum deviatoric fully-grown edifice conclusion flexure (t = 3000 tau(m)) shown.