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  • 1
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    Geophysics. The future of permanent seismic networks (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-09-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Romanowicz, B -- Giardini, D -- New York, N.Y. -- Science. 2001 Sep 14;293(5537):2000-1.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Berkeley Seismological Laboratory, Berkeley, CA 94720-4760, USA. barbara@seismo.berkeley.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11557863" 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
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    Geophysics. The thickness of tectonic plates (2009)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2009-04-25
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Romanowicz, Barbara -- New York, N.Y. -- Science. 2009 Apr 24;324(5926):474-6. doi: 10.1126/science.1172879.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Berkeley Seismological Laboratory and Department of Earth and Planetary Science, University of California at Berkeley, Berkeley, CA 94720, USA. barbara@seismo.berkeley.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19390034" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
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  • 3
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    Waveform tomography reveals channeled flow at the base of the oceanic asthenosphere (2013)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2013-09-07
    Description: Understanding the relationship between different scales of convection that drive plate motions and hotspot volcanism still eludes geophysicists. Using full-waveform seismic tomography, we imaged a pattern of horizontally elongated bands of low shear velocity, most prominent between 200 and 350 kilometers depth, which extends below the well-developed low-velocity zone. These quasi-periodic fingerlike structures of wavelength ~2000 kilometers align parallel to the direction of absolute plate motion for thousands of kilometers. Below 400 kilometers depth, velocity structure is organized into fewer, undulating but vertically coherent, low-velocity plumelike features, which appear rooted in the lower mantle. This suggests the presence of a dynamic interplay between plate-driven flow in the low-velocity zone and active influx of low-rigidity material from deep mantle sources deflected horizontally beneath the moving top boundary layer.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉French, Scott -- Lekic, Vedran -- Romanowicz, Barbara -- New York, N.Y. -- Science. 2013 Oct 11;342(6155):227-30. doi: 10.1126/science.1241514. Epub 2013 Sep 5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Berkeley Seismological Laboratory, Berkeley, CA 94720, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24009355" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
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  • 4
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    Inferences on flow at the base of Earth's mantle based on seismic anisotropy (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-01-17
    Description: We applied global waveform tomography to model radial anisotropy in the whole mantle. We found that in the last few hundred kilometers near the core-mantle boundary, horizontally polarized S-wave velocities (VSH) are, on average, faster (by approximately 1%) than vertically polarized S-wave velocities (VSV), suggesting a large-scale predominance of horizontal shear. This confirms that the D" region at the base of the mantle is also a mechanical boundary layer for mantle convection. A notable exception to this average signature can be found at the base of the two broad low-velocity regions under the Pacific Ocean and under Africa, often referred to as "superplumes," where the anisotropic pattern indicates the onset of vertical flow.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Panning, Mark -- Romanowicz, Barbara -- New York, N.Y. -- Science. 2004 Jan 16;303(5656):351-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Berkeley Seismological Laboratory, 215 McCone Hall, University of California, Berkeley, CA 94720, USA. mpanning@seismo.berkeley.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14726586" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
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  • 5
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    An observation of PKJKP: inferences on inner core shear properties (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-04-16
    Description: The seismic phase PKJKP, which traverses the inner core as a shear wave and would provide direct evidence for its solidity, has been difficult to detect. Using stacked broadband records from the Grafenberg array in Germany, we documented a high signal-to-noise phase, the arrival time and slowness of which agree with theoretical predictions for PKJKP. The back azimuth of this arrival is also consistent with predictions for PKJKP, as is the comparison with a pseudoliquid inner core model. Envelope modeling of the PKJKP waveform implies a shear velocity gradient with depth in the inner core that is slightly larger than that in the preliminary reference Earth model.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cao, Aimin -- Romanowicz, Barbara -- Takeuchi, Nozomu -- New York, N.Y. -- Science. 2005 Jun 3;308(5727):1453-5. Epub 2005 Apr 14.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Seismological Laboratory, University of California, Berkeley, California, USA. acao@seismo.berkeley.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15831719" target="_blank"〉PubMed〈/a〉
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  • 6
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    Three-dimensional structure at the base of the mantle beneath the central pacific (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-10-23
    Description: Forward modeling of differential travel times of phases sensitive to lowermost mantle beneath the central Pacific reveals lateral heterogeneity that is higher in amplitude than predicted by tomographic models. A broad zone of low S velocity (-4 percent with respect to standard models), which may correspond to the base of a thermal "plume," narrows and is deflected as it extends to about 1000 kilometers above the core-mantle boundary. To the east of this zone, a localized region of fast S velocity (+5 percent) suggests strong heterogeneity or anisotropy related to the presence of high pressure and temperature assemblages, which may or may not involve core material. Its presence could also explain the observation of precursors to core reflected phases in this region.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Breger -- Romanowicz -- New York, N.Y. -- Science. 1998 Oct 23;282(5389):718-20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Seismological Laboratory, University of California, Berkeley, CA 94720, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9784124" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
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  • 7
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    Viscosity of oceanic asthenosphere inferred from remote triggering of earthquakes (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-06-05
    Description: A sequence of large interplate earthquakes from 1952 to 1965 along the Aleutian arc and Kurile-Kamchatka trench released accumulated stresses along nearly the entire northern portion of the Pacific Plate boundary. The postseismic stress evolution across the northern Pacific and Arctic basins, calculated from a viscoelastic coupling model with an asthenospheric viscosity of 5 x 10(17) pascal seconds, is consistent with triggering of oceanic intraplate earthquakes, temporal patterns in seismicity at remote plate boundaries, and space-based geodetic measurements of anomalous velocity over an area 7000 by 7000 kilometers square during the 30-year period after the sequence.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pollitz -- Burgmann -- Romanowicz -- New York, N.Y. -- Science. 1998 May 22;280(5367):1245-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉F. F. Pollitz and R. Burgmann, Department of Geology, University of California, Davis, Davis, CA 95616, USA. B. Romanowicz, University of California Seismological Laboratory, 475 McCone Hall, Berkeley, CA 94720, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9596574" target="_blank"〉PubMed〈/a〉
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  • 8
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    Superplumes from the core-mantle boundary to the lithosphere: implications for heat flux (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-04-20
    Description: Three-dimensional modeling of upper-mantle anelastic structure reveals that thermal upwellings associated with the two superplumes, imaged by seismic elastic tomography at the base of the mantle, persist through the upper-mantle transition zone and are deflected horizontally beneath the lithosphere. This explains the unique transverse shear wave isotropy in the central Pacific. We infer that the two superplumes may play a major and stable role in supplying heat and horizontal flow to the low-viscosity asthenospheric channel, lubricating plate motions and feeding hot spots. We suggest that more heat may be carried through the core-mantle boundary than is accounted for by hot spot fluxes alone.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Romanowicz, Barbara -- Gung, Yuancheng -- New York, N.Y. -- Science. 2002 Apr 19;296(5567):513-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Seismological Laboratory, University of California, Berkeley, 215 McCone Hall, Berkeley, CA 94720, USA. barbara@seismo.berkeley.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11964474" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
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  • 9
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    Anisotropy in the Inner Core: Could It Be Due To Low-Order Convection? (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-11-08
    Description: A recently assembled data set of inner core-sensitive free oscillation splitting measurements and body wave differential travel times provides constraints on the patterns of anisotropy in the Earth's inner core. Applying a formalism that allows departures from radial symmetry and cylindrical anisotropy results in models with P-wave velocity distributions whose strength and pattern are incompatible with frozen-in anisotropy, but rather suggest a simple large-scale convection regime in the inner core.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Romanowicz -- Li -- Durek -- New York, N.Y. -- Science. 1996 Nov 8;274(5289):963-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉B. Romanowicz, Seismographic Station and Department of Geology and Geophysics, University of California at Berkeley, Berkeley, CA 94720, USA. X.-D. Li and J. Durek, Seismographic Station, University of California at Berkeley, Berkeley, CA 94720, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8875934" target="_blank"〉PubMed〈/a〉
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  • 10
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    The cape mendocino, california, earthquakes of april 1992: subduction at the triple junction (1993)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1993-07-23
    Description: The 25 April 1992 magnitude 7.1 Cape Mendocino thrust earthquake demonstrated that the North America-Gorda plate boundary is seismogenic and illustrated hazards that could result from much larger earthquakes forecast for the Cascadia region. The shock occurred just north of the Mendocino Triple Junction and caused strong ground motion and moderate damage in the immediate area. Rupture initiated onshore at a depth of 10.5 kilometers and propagated up-dip and seaward. Slip on steep faults in the Gorda plate generated two magnitude 6.6 aftershocks on 26 April. The main shock did not produce surface rupture on land but caused coastal uplift and a tsunami. The emerging picture of seismicity and faulting at the triple junction suggests that the region is likely to continue experiencing significant seismicity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Oppenheimer, D -- Eaton, J -- Jayko, A -- Lisowski, M -- Marshall, G -- Murray, M -- Simpson, R -- Stein, R -- Beroza, G -- Magee, M -- Carver, G -- Dengler, L -- McPherson, R -- Gee, L -- Romanowicz, B -- Gonzalez, F -- Li, W H -- Satake, K -- Somerville, P -- Valentine, D -- New York, N.Y. -- Science. 1993 Jul 23;261(5120):433-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17770022" target="_blank"〉PubMed〈/a〉
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