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  • American Association for the Advancement of Science (AAAS)  (2)
  • 1
    Publication Date: 2003-12-06
    Description: We present tomographic evidence for the existence of deep-mantle thermal convection plumes. P-wave velocity images show at least six well-resolved plumes that extend into the lowermost mantle: Ascension, Azores, Canary, Easter, Samoa, and Tahiti. Other less well-resolved plumes, including Hawaii, may also reach the lowermost mantle. We also see several plumes that are mostly confined to the upper mantle, suggesting that convection may be partially separated into two depth regimes. All of the observed plumes have diameters of several hundred kilometers, indicating that plumes convey a substantial fraction of the internal heat escaping from Earth.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Montelli, Raffaella -- Nolet, Guust -- Dahlen, F A -- Masters, Guy -- Engdahl, E Robert -- Hung, Shu-Huei -- New York, N.Y. -- Science. 2004 Jan 16;303(5656):338-43. Epub 2003 Dec 4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geosciences, Princeton University, Princeton, NJ 08544, USA. montelli@princeton.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14657505" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2007-06-09
    Description: Double Benioff zones provide opportunities for insight into seismogenesis because the underlying mechanism must explain two layers of deep earthquakes and the separation between them. We characterize layer separation inside subducting plates with a coordinate rotation to calculate the slab-normal distribution of earthquakes. Benchmark tests on well-established examples confirm that layer separation is accurately quantified with global seismicity catalogs alone. Global analysis reveals double Benioff zones in 30 segments, including all 16 subduction zones investigated, with varying subducting plate ages and stress orientations, which implies that they are inherent in subducting plates. Layer separation increases with age and is more consistent with dehydration of antigorite than chlorite.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Brudzinski, Michael R -- Thurber, Clifford H -- Hacker, Bradley R -- Engdahl, E Robert -- New York, N.Y. -- Science. 2007 Jun 8;316(5830):1472-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Geology Department, Miami University, Oxford, OH 45056, USA. brudzimr@muohio.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17556583" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Location Call Number Expected Availability
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