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  • 2015-2019  (11)
  • 2000-2004  (26)
  • 1990-1994  (79)
  • 1
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    Strong motion seismology (1991)
    In:  Rev. Geophys., Luxembourg, EGS-Gauthier-Villars, vol. 29, no. S, pp. 700-720, pp. 1310
    Details
    Publication Date: 1991
    Keywords: Strong motions ; Review article ; Earthquake engineering, engineering seismology ; 7235 ; Seismology ; Strong ; motions ; and ; engineering ; seismology ; 7294 ; Instruments ; and ; techniques ; 7215 ; Earthquake ; parameters ; 7205 ; Body ; waves
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Seimicity in the western basin apparently tiggered by the Landers, California, Earthquake, 28 June 1992 (1994)
    In:  Bull. Seism. Soc. Am., Luxembourg, EGS-Gauthier-Villars, vol. 84, no. 3, pp. 863-891, pp. 1310
    Details
    Publication Date: 1994
    Keywords: Seismicity ; Aftershocks ; Earthquake ; Statistical investigations ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Earthquake rate analysis (1993)
    In:  Tectonophys., Luxembourg, EGS-Gauthier-Villars, vol. 218, no. S, pp. 1-22, pp. 1310
    Details
    Publication Date: 1993
    Keywords: Seismicity ; Statistical investigations
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Site response, attenuation and source spectra of S waves along the Guerrero, Mexico, subduction zone (1990)
    In:  Bulletin of the Seismological Society of America, Luxembourg, Conseil de l'Europe, vol. 80, no. 6, pp. 1481-1503, pp. 1095, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1990
    Keywords: Site amplification ; Attenuation ; Spectrum ; Shear waves ; Subduction zone ; Fault zone ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    Modeling the Effect of Potential Nitric Acid Removal During Convective Injection of Water Vapor Over the Central United States on the Chemical Composition of the Lower Stratosphere (2019)
    Wiley
    Details
    Publication Date: 2019
    Description: Abstract Tropopause‐penetrating convection is a frequent seasonal feature of the Central United States climate. This convection presents the potential for consistent transport of water vapor into the upper troposphere and lower stratosphere (UTLS) through the lofting of ice, which then sublimates. Water vapor enhancements associated with convective ice lofting have been observed in both in situ and satellite measurements. These water vapor enhancements can increase the probability of sulfate aerosol‐catalyzed heterogeneous reactions that convert reservoir chlorine (HCl and ClONO2) to free radical chlorine (Cl and ClO) that leads to catalytic ozone loss. In addition to water vapor transport, lofted ice may also scavenge nitric acid and further impact the chlorine activation chemistry of the UTLS. We present a photochemical model that resolves the vertical chemical structure of the UTLS to explore the effect of water vapor enhancements and potential additional nitric acid removal. The model is used to define the response of stratospheric column ozone to the range of convective water vapor transported and the temperature variability of the lower stratosphere currently observed over the Central United States in conjunction with potential nitric acid removal and to scenarios of elevated sulfate aerosol surface area density representative of possible future volcanic eruptions or solar radiation management. We find that the effect of HNO3 removal is dependent on the magnitude of nitric acid removal and has the greatest potential to increase chlorine activation and ozone loss under UTLS conditions that weakly favor the chlorine activation heterogeneous reactions by reducing NOx sources.
    Print ISSN: 2169-897X
    Electronic ISSN: 2169-8996
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 6
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    Investigation of the Ground-Motion Variability Associated with Site Response for Sites with VS30 over 500 m/s (2015)
    Seismological Society of America (SSA)
    Details
    Publication Date: 2015-04-01
    Description: Understanding and reducing uncertainties in ground-motion prediction are high priorities for seismic-hazard analysis. This article examines , the variability in synthetic ground motions at rock sites caused by the variability in randomly generated velocity profiles of the geological column from 5 km depth to the surface. Only sites with V S 30 of 500 m/s or higher are considered, and linearity is assumed. These synthetic estimates of the mean value of are a complicated but understandable function of magnitude, period, and V S 30 . The distribution of modeled residual response spectral amplitudes at several oscillator periods is not lognormal, but the deviations are in the central part of the distribution, in which the effect on probabilistic seismic-hazard analysis may not be very large. Adding another constraint to the velocity profile, namely that the shear-wave velocity of the uppermost layer should be at least 70% of V S 30 , greatly reduces the uncertainty at high frequencies. We tentatively identify sites with this property as nonresonant rock, because it excludes sites with a strong resonance in a thin shallow layer. The reduction in uncertainty that this allows might reduce or eliminate the contradiction between the U.S. National Seismic Hazard Map and precarious rocks in southern California. Furthermore, for nonresonant rock sites, the residual impact of the ergodic assumption might be reduced to more tolerable levels. Online Material: Tables of variability values.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
    Published by Seismological Society of America (SSA)
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  • 7
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    Free Radicals Within the Antarctic Vortex: The Role of CFCs in Antarctic Ozone Loss (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-01-04
    Description: How strong is the case linking global release of chlorofluorocarbons to episodic disappearance of ozone from the Antarctic stratosphere each austral spring? Three lines of evidence defining a link are (i) observed containment in the vortex of ClO concentrations two orders of magnitude greater than normal levels; (ii) in situ observations obtained during ten high-altitude aircraft flights into the vortex as the ozone hole was forming that show a decrease in ozone concentrations as ClO concentrations increased; and (iii) a comparison between observed ozone loss rates and those predicted with the use of absolute concentrations of ClO and BrO, the rate-limiting radicals in an array of proposed catalytic cycles. Recent advances in our understanding of the kinetics, photochemistry, and structural details of key intermediates in these catalytic cycles as well as an improved absolute calibration for ClO and BrO concentrations at the temperatures and pressures encountered in the lower antarctic stratosphere have been essential for defining the link.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Anderson, J G -- Toohey, D W -- Brune, W H -- New York, N.Y. -- Science. 1991 Jan 4;251(4989):39-46.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17778601" 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 potential for ozone depletion in the arctic polar stratosphere (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-05-31
    Description: The nature of the Arctic polar stratosphere is observed to be similar in many respects to that of the Antarctic polar stratosphere, where an ozone hole has been identified. Most of the available chlorine (HCl and ClONO(2)) was converted by reactions on polar stratospheric clouds to reactive ClO and Cl(2)O(2) throughout the Arctic polar vortex before midwinter. Reactive nitrogen was converted to HNO(3), and some, with spatial inhomogeneity, fell out of the stratosphere. These chemical changes ensured characteristic ozone losses of 10 to 15% at altitudes inside the polar vortex where polar stratospheric clouds had occurred. These local losses can translate into 5 to 8% losses in the vertical column abundance of ozone. As the amount of stratospheric chlorine inevitably increases by 50% over the next two decades, ozone losses recognizable as an ozone hole may well appear.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Brune, W H -- Anderson, J G -- Toohey, D W -- Fahey, D W -- Kawa, S R -- Jones, R L -- McKenna, D S -- Poole, L R -- New York, N.Y. -- Science. 1991 May 31;252(5010):1260-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17842951" 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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  • 9
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    Evidence for deep magma injection beneath Lake Tahoe, Nevada-California (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-08-07
    Description: A deep earthquake swarm in late 2003 at Lake Tahoe, California (Richter magnitude 〈 2.2; depth of 29 to 33 kilometers), was coeval with a transient displacement of 6 millimeters horizontally outward from the swarm and 8 millimeters upward measured at global positioning system station Slide Mountain (SLID) 18 kilometers to the northeast. During the first 23 days of the swarm, hypocentral depths migrated at a rate of 2.4 millimeters per second up-dip along a 40-square-kilometer structure striking north 30 degrees west and dipping 50 degrees to the northeast. SLID's transient velocity of 20 millimeters per year implies a lower bound of 200 nanostrains per year (parts per billion per year) on local strain rates, an order of magnitude greater than the 1996 to 2003 regional rate. The geodetic displacement is too large to be explained by the elastic strain from the cumulative seismic moment of the sequence, suggesting an aseismic forcing mechanism. Aspects of the swarm and SLID displacements are consistent with lower-crustal magma injection under Lake Tahoe.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Smith, Kenneth D -- von Seggern, David -- Blewitt, Geoffrey -- Preston, Leiph -- Anderson, John G -- Wernicke, Brian P -- Davis, James L -- New York, N.Y. -- Science. 2004 Aug 27;305(5688):1277-80. Epub 2004 Aug 5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Nevada Seismological Laboratory, University of Nevada, Reno, NV 89557, USA. ken@seismo.unr.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15297623" 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
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    The seasonal evolution of reactive chlorine in the northern hemisphere stratosphere (1993)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1993-08-27
    Description: In situ measurements of chlorine monoxide (ClO) at mid- and high northern latitudes are reported for the period October 1991 to February 1992. As early as mid-December and throughout the winter, significant enhancements of this ozone-destroying radical were observed within the polar vortex shortly after temperatures dropped below 195 k. Decreases in ClO observed in February were consistent with the rapid formation of chlorine nitrate (ClONO(2)) by recombination of ClO with nitrogen dioxide (NO(2)) released photochemically from nitric acid (HNO(3)). Outside the vortex, ClO abundances were higher than in previous years as a result of NOx suppression by heterogeneous reactions on sulfate aerosols enhanced by the eruption of Mount Pinatubo.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Toohey, D W -- Avallone, L M -- Lait, L R -- Newman, P A -- Schoeberl, M R -- Fahey, D W -- Woodbridge, E L -- Anderson, J G -- New York, N.Y. -- Science. 1993 Aug 27;261(5125):1134-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17790345" 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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