منابع مشابه
The inner inner core of Earth.
T solid inner core (Fig. 1) is the most remote and enigmatic part of our planet, and, next to the crust, is the smallest ‘‘official’’ subdivision of Earth’s interior. It was discovered in 1936 (1), and by 1972 it was established that it was solid, albeit with a very small rigidity (2–4). By 1993 it had been established that it was crystalline (5). The inner core is isolated from the rest of Ear...
متن کاملThe inner inner core of the Earth: Texturing of iron crystals from three-dimensional seismic anisotropy
We present a three-dimensional model of the seismic anisotropy and texturing of iron crystals in the inner core. The form of the anisotropy changes suddenly at slightly less than half of the inner core radius. The outer part is composed of iron crystals of a single phase with different degrees of preferred alignment along the spin axis of the Earth. The inner part may be composed of a different...
متن کاملSubstructure of the inner core of the Earth.
The rationale is disclosed for a substructure within the Earth's inner core, consisting of an actinide subcore at the center of the Earth, surrounded by a subshell composed of the products of nuclear fission and radioactive decay. Estimates are made as to possible densities, physical dimensions, and chemical compositions. The feasibility for self-sustaining nuclear fission within the subcore is...
متن کاملInner Earth: Towards Interaction Patterns
Inner Earth is a project to develop an online activity set to help children learn and think about what is inside the Earth. The child is taken on a ride in an elevator to the core of the Earth and they stop along the way to undertake certain activities involving plants, sewers, mines, fossils, convection and magma. The system was developed between imedia in Providence, Rhode Island, USA, and Qu...
متن کاملInner core attenuation anisotropy
We investigate the attenuation structure of the Earth's inner core and its relationship to the velocity structure globally and along various sampling directions, by studying the amplitude ratios and the differential travel times of the PKiKP–PKIKP and PKPbc– PKIKP phases. Our observations reveal that the amplitude ratios of these core phases, like the differential travel times, vary in both sam...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 2002
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.232565899