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  • Articles  (94)
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  • 1
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    Using cluster analysis to organize and explore regional GPS velocities (2012)
    Wiley
    Details
    Publication Date: 2012-09-26
    Description: Cluster analysis offers a simple visual exploratory tool for the initial investigation of regional Global Positioning System (GPS) velocity observations, which are providing increasingly precise mappings of actively deforming continental lithosphere. The deformation fields from dense regional GPS networks can often be concisely described in terms of relatively coherent blocks bounded by active faults, although the choice of blocks, their number and size, can be subjective and is often guided by the distribution of known faults. To illustrate our method, we apply cluster analysis to GPS velocities from the San Francisco Bay Region, California, to search for spatially coherent patterns of deformation, including evidence of block-like behavior. The clustering process identifies four robust groupings of velocities that we identify with four crustal blocks. Although the analysis uses no prior geologic information other than the GPS velocities, the cluster/block boundaries track three major faults, both locked and creeping.
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 2
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    Illumination of rheological mantle heterogeneity by the M7.2 2010 El Mayor-Cucapah earthquake (2012)
    Wiley
    Details
    Publication Date: 2012-06-02
    Description: Major intracontinental strike-slip faults tend to mark boundaries between lithospheric blocks of contrasting mechanical properties along much of their length. Both crustal and mantle heterogeneities can form such boundaries, but the role of crustal versus mantle strength contrasts for localizing strain sufficiently to generate major faults remains unclear. Using the crustal velocity field observed through the Global Positioning System (GPS) in the epicentral area of the M7.2 2010 El Mayor-Cucapah earthquake, Baja California, we find that transient deformation observed after the event is anomalously small in areas of relatively high seismic velocity in the shallow upper mantle (∼50 km depth). This pattern is best explained with a laterally heterogeneous viscoelastic structure that mimics the seismic structure. The mantle of the Southern Colorado River Desert (SCRD) and Peninsular Ranges (PR), which bound the fault system to its east and west, respectively, have anomalously high viscosity and seismic velocity. We hypothesize that compared with the rest of the San Andreas fault (SAF) system to its north, the strike-slip fault system in northern Baja California is narrow because of the presence of the PR and SCRD high-viscosity regions which bound it.
    Electronic ISSN: 1525-2027
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 3
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    Investigating Ductile Lithosphere Deformation in Southern California (2013)
    Wiley
    Details
    Publication Date: 2013-08-07
    Description: A workshop to investigate properties and processes of ductile lithosphere deformation was held in Menlo Park, Calif. This workshop provided overviews of the newest results from lab, field, and geodetic modeling disciplines relevant to better understanding earthquake processes in Southern California. A principal goal of the workshop was to bring together niche experts in tectonic geodesy, laboratory rock mechanics, and field observations of ductile rocks to gain better interdisciplinary understanding of the stress transfer process between brittle-elastic upper crust and ductile lithosphere in Southern California.
    Print ISSN: 0096-3941
    Electronic ISSN: 2324-9250
    Topics: Geosciences
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 4
    Electronic Resource
    Electronic Resource
    Pop-up disaster (2001)
    [s.l.] : Nature Publishing Group
    Nature 410 (2001), S. 757-758 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] During the past decade, satellite technology has spawned a revolution in measuring the surface deformation caused by earthquakes. Yet as Bilham and England show on page 806 of this issue, classical ground-based surveying methods in use as long as 150 years ago can still yield astounding ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35071199
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Tectonic contraction across Los Angeles after removal of groundwater pumping effects (2001)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 412 (2001), S. 812-815 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] After the 1987 Whittier Narrows and 1994 Northridge earthquakes revealed that blind thrust faults represent a significant threat to metropolitan Los Angeles, a network of 250 continuously recording global positioning system (GPS) stations was deployed to monitor displacements associated with ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35090558
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  • 6
    Electronic Resource
    Electronic Resource
    Uplift, thermal unrest and magma intrusion at Yellowstone caldera (2006)
    [s.l.] : Nature Publishing Group
    Nature 440 (2006), S. 72-75 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Yellowstone caldera, in the western United States, formed ∼640,000 years ago when an explosive eruption ejected ∼1,000 km3 of material. It is the youngest of a series of large calderas that formed during sequential cataclysmic eruptions that began ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature04507
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  • 7
    Electronic Resource
    Electronic Resource
    Precursors to eruption (1990)
    [s.l.] : Nature Publishing Group
    Nature 343 (1990), S. 590-591 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] JAPANESE scientists have assembled a uniquely detailed picture of events that led up to the submarine eruption of Teishi volcano, off the Izu Peninsula 100 km southwest of Tokyo1. The eruption was small and was not destructive but data gathered by the Japanese illustrate the merits ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/343590a0
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  • 8
    Electronic Resource
    Electronic Resource
    Does the mid-crust flow? (1992)
    [s.l.] : Nature Publishing Group
    Nature 358 (1992), S. 454-455 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE Earth's crust is brittle, and its man-tle ductile, but what happens between? Measurements of surface movement fol-lowing the injection of magma into fis-sures near Krafla volcano in Iceland, reported by Foulger et al. on page 488 of this issue1, suggest that the mid-to-lower crust, perhaps 8-30 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/358454a0
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  • 9
    Electronic Resource
    Electronic Resource
    Earthquake recurrence and risk assessment in circum-Pacific seismic gaps (1989)
    [s.l.] : Nature Publishing Group
    Nature 341 (1989), S. 432-434 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The seismic gap concept originated from the work of Fedotov1 and Mogi2, who examined the relation between seismicity and the occurrence of great earthquakes on the margin of the north-west Pacific. They noted that over a time interval of about 30 years, the spatial distribution of background ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/341432a0
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  • 10
    Electronic Resource
    Electronic Resource
    Tsunami-wave seismology (1989)
    [s.l.] : Nature Publishing Group
    Nature 340 (1989), S. 674-675 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] TSUNAMIS (seismic sea waves) are among the most awesome and destructive effects of great sub-sea earthquakes. They result when fault slippage beneath the sea floor abruptly displaces the ocean bottom and generates a shallow-water gravity wave whose wavelength and speed depend on water depth at the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/340674a0
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