著者

Robert C. BOSTROM

出版者

The Seismological Society of Japan, The Volcanological Society of Japan, The Geodetic Society of Japan

雑誌

Journal of Physics of the Earth (ISSN:00223743)

巻号頁・発行日

vol.29, no.2, pp.145-161, 1981 (Released:2009-04-30)

参考文献数

29

被引用文献数

1 2

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Flexure of the mantle by the east-west M2 wave imposes non-reversing small body torques. The stress and displacement have been evaluated for the plausible range of the elastic quality factor Q. The non-cancelling stresses are of the order 5×10-7dyn/cm2, varying as the magnitude of Q-1. The displacement varies as Q-2 and is correspondingly minute, but is cumulative through geologic time. The role of the lithosphere becomes dominant, because stress diffusion causes it to act as a transmission channel. Stress acting on isostatic lithosphere is additive horizontally, as wind stress is additive across a floating ice sheet. In respect to oceanic lithosphere, within a period of about 106 years the stress reaches a value of tens of bars and its displacement rate several cm/yr. It is surmised that the values reached are limited by imperfect elasticity of the lithosphere. The energy consumption based upon gravimetric values of the phase lag, between 1.3 and 2.3×1026erg/yr, is a fraction of the dissipation astronomically observed but not found in the seas. The effect of lithosphere creep is compared with Pacific and Atlantic tectonic features.