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  • 1
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    In:  Pageoph, Kunming, China, Geological Society, vol. 136, no. 5761, pp. 459-477, pp. 2486, (ISBN 1-86239-117-3)
    Publication Date: 1991
    Keywords: Earthquake precursor: statistical anal. of seismicity ; Statistical investigations ; Earthquake ; Seismicity ; Udias
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  • 2
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    American Association for the Advancement of Science (AAAS)
    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〉
    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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  • 3
    ISSN: 1420-9136
    Keywords: Subduction zone ; New Britain earthquakes ; mature seismic gap ; earthquake prediction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract To better understand the mechanics of subduction and the process of breaking a mature seismic gap, we study seismic activity along the western New Britain subduction segment (147°E–151°E, 4°S–8°S) through earthquakes withm b ≥5.0 in the outer-rise, the upper area of subducting slab and at intermediate depths to 250 km, from January 1964 to December 1990. The segment last broke fully in large earthquakes of December, 28, 1945 (M s =7.9) and May 6, 1947 (M s =7.7.), and its higher seismic potential has been recognized byMcCann et al., (1979). Recently the segment broke partially in two smaller events of February, 8, 1987 (M s =7.4) and October 16, 1987 (M s =7.4), leaving still unbroken areas. We observe from focal mechanisms that the outer-rise along the whole segment was under pronounced compression from the late 60's to at least October 1987 (with exception of the tensional earthquake of December 11, 1985), signifying the mature stage of the earthquake cycle. Simultaneously the slab at intermediate depths below 40 km was under tension before the earthquake of October 16, 1987. That event, with a smooth rupture lasting 32 sec, rupture velocity of 2.0 km/sec, extent of approximately 70 km and moment of 1.2×1027 dyne-cm, did not change significantly the compressive state of stress in the outer-rise of that segment. The earthquake did not fill the gap completely and this segment is still capable of rupturing either in an earthquake which would fill the gap between the 1987 and 1971 events, or in a larger magnitude event (M s =7.7–7.9), comparable to earthquakes observed in that segment in 1906, 1945 and 1947.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 1991-12-01
    Description: To better understand the mechanics of subduction and the process of breaking a mature seismic gap, we study seismic activity along the western New Britain subduction segment (147°E–151°E, 4°S–8°S) through earthquakes with m b ≥5.0 in the outer-rise, the upper area of subducting slab and at intermediate depths to 250 km, from January 1964 to December 1990. The segment last broke fully in large earthquakes of December, 28, 1945 ( M s =7.9) and May 6, 1947 ( M s =7.7.), and its higher seismic potential has been recognized by McCann et al. , (1979). Recently the segment broke partially in two smaller events of February, 8, 1987 ( M s =7.4) and October 16, 1987 ( M s =7.4), leaving still unbroken areas. We observe from focal mechanisms that the outer-rise along the whole segment was under pronounced compression from the late 60's to at least October 1987 (with exception of the tensional earthquake of December 11, 1985), signifying the mature stage of the earthquake cycle. Simultaneously the slab at intermediate depths below 40 km was under tension before the earthquake of October 16, 1987. That event, with a smooth rupture lasting 32 sec, rupture velocity of 2.0 km/sec, extent of approximately 70 km and moment of 1.2×1027 dyne-cm, did not change significantly the compressive state of stress in the outer-rise of that segment. The earthquake did not fill the gap completely and this segment is still capable of rupturing either in an earthquake which would fill the gap between the 1987 and 1971 events, or in a larger magnitude event ( M s =7.7–7.9), comparable to earthquakes observed in that segment in 1906, 1945 and 1947. ©1991 Birkhäuser Verlag
    Print ISSN: 0033-4553
    Electronic ISSN: 1420-9136
    Topics: Geosciences , Physics
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