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  • 1
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    Synthetic Hybrid Broadband Seismograms Based on InSAR Coseismic Displacements (2014)
    Seismological Society of America (SSA)
    Details
    Publication Date: 2014-12-05
    Description: Conventional acceleration records do not properly account for the observed coseismic ground displacements, thus leading to an inaccurate definition of the seismic demand needed for the design of flexible (long period) structures. Large coseismic displacements observed during the 27 February 2010 Maule earthquake suggest that this effect should be included in the design of flexible structures by modifying the design ground motions and spectra considered. Consequently, Green’s functions are used herein to compute synthetic low-frequency seismograms that are consistent with the coseismic displacement field obtained from interferometry using synthetic aperture radar (SAR) images. In this case, the coseismic displacement field was determined by interfering twenty SAR images of the Advanced Land Observation Satellite (ALOS)/PALSAR satellite taken between 12 October 2007 and 28 May 2010. These images cover the region affected by the 2010 M w  8.8 Maule earthquake. Synthetic broadband seismograms are built by superimposing the low-pass filtered synthetic low-frequency seismograms with high-frequency strong-motion data. The broadband seismograms generated are then consistent with the coseismic displacement field and the high-frequency content of the earthquake. A sensitivity analysis is performed using three different fault and slip parameters, the rupture velocity, the corner frequency, and the slip rise time. Results show that the optimal corner frequency of the low-pass filter f c =1/ T c , leads to a trade-off between acceleration and displacement accuracy. Furthermore, spectral response for long periods, say T ≥8 s, is relatively insensitive to the value of T c , whereas shorter periods are strongly dependent on both the slip rise time and T c . In general, larger displacements consistent with coseismic data are obtained using this technique instead of digitally processing the acceleration ground-motion records.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
    Published by Seismological Society of America (SSA)
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  • 2
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    Deformation of the 2002 Denali Fault earthquakes, mapped by Radarsat-1 interferometry (2003)
    In:  Eos, Trans., Am. Geophys. Un., Stuttgart, Pergamon, vol. 84, no. 41, pp. 425, 430 & 431, pp. L13613, (ISSN: 1340-4202)
    Details
    Publication Date: 2003
    Keywords: Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Earthquake ; RADAR ; Alaska ; USA
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Renewed inflation of Long Valley Caldera, California (2011 to 2014) (2015)
    Wiley
    Details
    Publication Date: 2015-06-19
    Description: Slow inflation began at Long Valley Caldera in late 2011, coinciding with renewed swarm seismicity. Ongoing deformation is concentrated within the caldera. We analyze this deformation using a combinflation of GPS and InSAR (TerraSAR-X) data processed with a persistent scatterer technique. The extension rate of the dome-crossing baseline during this episode (CA99 to KRAC) is 1 cm/yr, similar to past inflation episodes (1990–95 and 2002–03), and about a tenth of the peak rate observed during the 1997 unrest. The current deformation is well modeled by the inflation of a prolate spheroidal magma reservoir ~7 km beneath the resurgent dome, with a volume change of ~6 x 10 6 m 3 /yr from 2011.7 through the end of 2014. The current data cannot resolve a second source, which was required to model the 1997 episode. This source appears to be in the same region as previous inflation episodes, suggesting a persistent reservoir.
    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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  • 4
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    Spectroscopic observation of strain-assisted T_{C} enhancement in EuO upon Gd doping (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-02-23
    Description: Author(s): S. G. Altendorf, N. Hollmann, R. Sutarto, C. Caspers, R. C. Wicks, Y.-Y. Chin, Z. Hu, H. Kierspel, I. S. Elfimov, H. H. Hsieh, H.-J. Lin, C. T. Chen, and L. H. Tjeng The origin of the Curie temperature enhancement of EuO upon Gd doping is studied by using soft x-ray absorption spectroscopy on epitaxial pure and Gd-doped EuO thin films. Temperature- and doping-dependent changes in the oxygen K edge spectra provide information about the correlation of magnetism an... [Phys. Rev. B 85, 081201] Published Wed Feb 22, 2012
    Keywords: Semiconductors I: bulk
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Fine-scale nutrient and carbonate system dynamics around cold-water coral reefs in the northeast Atlantic (2014)
    Springer Nature
    Details
    Publication Date: 2014-01-21
    Description: Ocean acidification has been suggested as a serious threat to the future existence of cold-water corals (CWC). However, there are few fine-scale temporal and spatial datasets of carbonate and nutrients conditions available for these reefs, which can provide a baseline definition of extant conditions. Here we provide observational data from four different sites in the northeast Atlantic that are known habitats for CWC. These habitats differ by depth and by the nature of the coral habitat. At depths where CWC are known to occur across these sites the dissolved inorganic carbon ranged from 2088 to 2186 μmol kg−1, alkalinity ranged from 2299 to 2346 μmol kg−1, and aragonite Ω ranged from 1.35 to 2.44. At two sites fine-scale hydrodynamics caused increased variability in the carbonate and nutrient conditions over daily time-scales. The observed high level of variability must be taken into account when assessing CWC sensitivities to future environmental change. Scientific Reports 4 doi: 10.1038/srep03671
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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  • 6
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    Mantle flow beneath a continental strike-slip fault: postseismic deformation after the 1999 Hector Mine earthquake (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-09-08
    Description: Two recent large earthquakes in the Mojave Desert, California-the magnitude 7.3 1992 Landers and magnitude 7.1 1999 Hector Mine earthquakes-have each been followed by elevated crustal strain rates over periods of months and years. Geodetic data collected after the Hector Mine earthquake exhibit a temporally decaying horizontal velocity field and a quadrant uplift pattern opposite to that expected for localized shear beneath the earthquake rupture. We interpret the origin of this accelerated crustal deformation to be vigorous flow in the upper mantle in response to the stress changes generated by the earthquake. Our results suggest that transient flow in the upper mantle is a fundamental component of the earthquake cycle and that the lower crust is a coherent stress guide coupling the upper crust with the upper mantle.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pollitz, F F -- Wicks, C -- Thatcher, W -- New York, N.Y. -- Science. 2001 Sep 7;293(5536):1814-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉U.S. Geological Survey, 345 Middlefield Road, MS 977, Menlo Park, CA 94025, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11546869" 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
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Migration of fluids beneath yellowstone caldera inferred from satellite radar interferometry (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-10-17
    Description: Satellite interferometric synthetic aperture radar is uniquely suited to monitoring year-to-year deformation of the entire Yellowstone caldera (about 3000 square kilometers). Sequential interferograms indicate that subsidence within the caldera migrated from one resurgent dome to the other between August 1992 and August 1995. Between August 1995 and September 1996, the caldera region near the northeast dome began to inflate, and accompanying surface uplift migrated to the southwest dome between September 1996 and June 1997. These deformation data are consistent with hydrothermal or magmatic fluid migration into and out of two sill-like bodies that are about 8 kilometers directly beneath the caldera.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wicks Jr -- Thatcher -- Dzurisin -- New York, N.Y. -- Science. 1998 Oct 16;282(5388):458-62.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉C. Wicks Jr. and W. Thatcher, U.S. Geological Survey (USGS), MS 977, Menlo Park, CA 94025, USA. D. Dzurisin, USGS, Cascades Volcano Observatory, 5400 MacArthur Boulevard, Vancouver, WA 98661, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9774269" 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
    Published by American Association for the Advancement of Science (AAAS)
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  • 8
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    The role of dyking and fault control in the rapid onset of eruption at Chaiten volcano, Chile (2011)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2011-10-21
    Description: Rhyolite is the most viscous of liquid magmas, so it was surprising that on 2 May 2008 at Chaiten Volcano, located in Chile's southern Andean volcanic zone, rhyolitic magma migrated from more than 5 km depth in less than 4 hours (ref. 1) and erupted explosively with only two days of detected precursory seismic activity. The last major rhyolite eruption before that at Chaiten was the largest volcanic eruption in the twentieth century, at Novarupta volcano, Alaska, in 1912. Because of the historically rare and explosive nature of rhyolite eruptions and because of the surprisingly short warning before the eruption of the Chaiten volcano, any information about the workings of the magmatic system at Chaiten, and rhyolitic systems in general, is important from both the scientific and hazard perspectives. Here we present surface deformation data related to the Chaiten eruption based on radar interferometry observations from the Japan Aerospace Exploration Agency (JAXA) DAICHI (ALOS) satellite. The data on this explosive rhyolite eruption indicate that the rapid ascent of rhyolite occurred through dyking and that melt segregation and magma storage were controlled by existing faults.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wicks, Charles -- de la Llera, Juan Carlos -- Lara, Luis E -- Lowenstern, Jacob -- England -- Nature. 2011 Oct 19;478(7369):374-7. doi: 10.1038/nature10541.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉US Geological Survey, Menlo Park, California 94025, USA. cwicks@usgs.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22012396" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 9
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    Accelerated uplift and magmatic intrusion of the Yellowstone caldera, 2004 to 2006 (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-11-10
    Description: The Yellowstone caldera began a rapid episode of ground uplift in mid-2004, revealed by Global Positioning System and interferometric synthetic aperture radar measurements, at rates up to 7 centimeters per year, which is over three times faster than previously observed inflation rates. Source modeling of the deformation data suggests an expanding volcanic sill of approximately 1200 square kilometers at a 10-kilometer depth beneath the caldera, coincident with the top of a seismically imaged crustal magma chamber. The modeled rate of source volume increase is 0.1 cubic kilometer per year, similar to the amount of magma intrusion required to supply the observed high heat flow of the caldera. This evidence suggests magma recharge as the main mechanism for the accelerated uplift, although pressurization of magmatic fluids cannot be ruled out.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chang, Wu-Lung -- Smith, Robert B -- Wicks, Charles -- Farrell, Jamie M -- Puskas, Christine M -- New York, N.Y. -- Science. 2007 Nov 9;318(5852):952-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112, USA. wchang@earth.utah.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17991858" 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
    Published by American Association for the Advancement of Science (AAAS)
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  • 10
    Electronic Resource
    Electronic Resource
    Vapor Pressure of Hafnium (IV) lodide. (1965)
    s.l. : American Chemical Society
    Journal of chemical & engineering data 10 (1965), S. 33-36 
    Details
    ISSN: 1520-5134
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/je60024a013
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    Paper (German National Licenses)
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