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  • 04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous  (1)
  • Disasters/economics/*prevention & control/statistics & numerical data  (1)
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  • 1
    Publication Date: 2017-04-04
    Description: The coupling/decoupling between the lithosphere and asthenosphere has significant implications for understanding many important aspects of plate tectonics and geodynamics. To drive plate motion, mantle convection requires coupling at the lithosphere–asthenosphere (LA) interface. Meanwhile a low viscosity layer in the asthenosphere is indicative of possible LA decoupling. Here we present an analytical model of a stratified uppermost mantle structure disturbed by a long-wavelength perturbation (such as the body tide) to analyse the influence of LA viscosity contrast on the growth (or decay) rates of the perturbation. We show that the viscosity contrast of 8–10 orders of magnitude would allow a relative motion of the lithosphere over the asthenosphere due to the long-wavelength perturbations at the rate of about 10 cm yr 1. These constrains on the viscosity contrast can allow to discriminate between the LA coupling and decoupling. The growing seismic and mineralogical evidences of a possible ultra low viscosity asthenospheric layer may be indicative of the LA decoupling and their relative motions due to longwavelength perturbations, and a contribution of the tidal drag on the plate motion should not be neglected in the regions of high viscosity contrasts.
    Description: Research supported by DFG IS203/1-1, Miur-Prin 2008, CNR Eurocores, TopoEurope, and RASP Program No. 23.
    Description: Published
    Description: 1-8
    Description: 3.3. Geodinamica e struttura dell'interno della Terra
    Description: JCR Journal
    Description: restricted
    Keywords: Lithosphere dynamics ; Asthenosphere ; Viscosity contrast ; Decoupling ; Analytical modelling ; Rayleigh–Taylor instability ; 04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
    Publication Date: 2015-06-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cutter, Susan L -- Ismail-Zadeh, Alik -- Alcantara-Ayala, Irasema -- Altan, Orhan -- Baker, Daniel N -- Briceno, Salvano -- Gupta, Harsh -- Holloway, Ailsa -- Johnston, David -- McBean, Gordon A -- Ogawa, Yujiro -- Paton, Douglas -- Porio, Emma -- Silbereisen, Rainer K -- Takeuchi, Kuniyoshi -- Valsecchi, Giovanni B -- Vogel, Coleen -- Wu, Guoxiong -- England -- Nature. 2015 Jun 18;522(7556):277-9. doi: 10.1038/522277a.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Hazards and Vulnerability Research Institute at the University of South Carolina, Columbia, USA. ; Karlsruhe Institute of Technology, Karlsruhe, Germany, and at the Institute of Earthquake Prediction, Russian Academy of Sciences, Moscow, Russia. ; Institute of Geography, National Autonomous University of Mexico, Mexico City, Mexico. ; Istanbul Technical University, Istanbul, Turkey. ; Laboratory for Atmospheric and Space Physics, University of Colorado at Boulder, Colorado, USA. ; United Nations Office for Disaster Risk Reduction, Divonne-les-Bains, France. ; National Geophysical Research Institute, Hyderabad, India, and a former member of the National Disaster Management Authority, Government of India, Delhi, India. ; Research Alliance for Disaster and Risk Reduction, Stellenbosch University, Stellenbosch, South Africa. ; Joint Centre for Disaster Research at Massey University and Senior Scientist at GNS Science, Wellington, New Zealand. ; Centre for Environment and Sustainability, and director of policy studies at the Institute for Catastrophic Loss Reduction, University of Western Ontario, London, Canada. ; Institute of Geosciences at the University of Tsukuba, Tsukuba, Japan. ; School of Psychological and Clinical Sciences, Charles Darwin University, Australia. ; Department of Sociology and Anthropology at Ateneo de Manila University, Quezon City, the Philippines. ; Center for Applied Developmental Science, University of Jena, Jena, Germany. ; Civil and Environmental Engineering Department, University of Yamanashi, Kofu, Japan, and founding director of the International Centre for Water Hazard Risk Management, Tsukuba, Japan. ; National Institute for Astrophysics, Rome, Italy, and at the National Research Council, Sesto Fiorentino, Italy. ; University of the Witwatersrand, Johannesburg, South Africa. ; Institute of Atmospheric Physics of the Chinese Academy of Sciences, Beijing, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26085255" target="_blank"〉PubMed〈/a〉
    Keywords: Building Codes ; Disaster Planning/economics/*methods ; Disasters/economics/*prevention & control/statistics & numerical data ; Earthquakes/mortality ; Humans ; International Cooperation/legislation & jurisprudence ; Nepal/epidemiology ; *Policy Making ; Risk Management/economics/*methods ; Risk Reduction Behavior
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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