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  • 1
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    Interaction of microseisms with crustal heterogeneity: A case study from the San Jacinto fault zone area (2013)
    Wiley
    Details
    Publication Date: 2013-04-16
    Description: We perform a multi-component analysis to evaluate the validity and limits of noise imaging in the San Jacinto fault zone (SJFZ) area. Estimates of noise propagation and scattering length scales in the area are combined with a noise-correlation based analysis of variability of noise constituents, excitation regions, and propagation patterns. We evaluate the quality of correlation-phase and -amplitude imaging of tectonic features in the context of observed noise properties. Statistical properties of a regional high-resolution 3D velocity model indicate that propagation of double-frequency microseism Rayleigh waves is sensitive to medium heterogeneity in the southern California plate boundary area. The analysis of noise correlation functions constructed from records of a regional seismic network suggests stable excitation of microseisms along the southern California coastline. The proximity to the source region together with randomization properties of the heterogeneous medium govern the scattered yet anisotropic character of the wave field. Insignificant travel time errors resulting from the associated imperfect reconstruction of inter-station Green's function estimates allow the resolution of a velocity contrast across the SJFZ from noise correlations. However, attenuation estimates are biased by the anisotropic propagation directions. The interaction of the ambient surface wave field with medium heterogeneity facilitates imaging of the velocity structure, but the inversion of the amplitude pattern is limited since it is dominated by wave field instead of medium properties.
    Electronic ISSN: 1525-2027
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 2
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    Influence of the Proto-Iceland Plume on the Topography of the Irish Lithosphere-Asthenosphere Boundary. 1st Plume Project Workshop "Plume-like instabilities in the upper mantle beneath Europe" (2006)
    In:  Ottrott, France
    Details
    Publication Date: 2006
    Keywords: TF VIII ; Task Force VIII ; Baby plumes in Central Europe
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    BIBLIOGRAPHY ILP
  • 3
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    Infrasound data inversion for atmospheric sounding (2012)
    Oxford University Press
    Details
    Publication Date: 2012-05-23
    Description: SUMMARY The International Monitoring System (IMS) of the Comprehensive Nuclear-Test-Ban Treaty (CTBT) continuously records acoustic waves in the 0.01–10 Hz frequency band, known as infrasound. These waves propagate through the layered structure of the atmosphere. Coherent infrasonic waves are produced by a variety of anthropogenic and natural sources and their propagation is controlled by spatiotemporal variations of temperature and wind velocity. Natural stratification of atmospheric properties (e.g. temperature, density and winds) forms waveguides, allowing long-range propagation of infrasound waves. However, atmospheric specifications used in infrasound propagation modelling suffer from lack and sparsity of available data above an altitude of 50 km. As infrasound can propagate in the upper atmosphere up to 120 km, we assume that infrasonic data could be used for sounding the atmosphere, analogous to the use of seismic data to infer solid Earth structure and the use of hydroacoustic data to infer oceanic structure. We therefore develop an inversion scheme for vertical atmospheric wind profiles in the framework of an iterative linear inversion. The forward problem is treated in the high-frequency approximation using a Hamiltonian formulation and complete first-order ray perturbation theory is developed to construct the Fréchet derivatives matrix. We introduce a specific parametrization for the unknown model parameters based on Principal Component Analysis. Finally, our algorithm is tested on synthetic data cases spanning different seasonal periods and network configurations. The results show that our approach is suitable for infrasound atmospheric sounding on a regional scale.
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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  • 4
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    Global oceanic microseism sources as seen by seismic arrays and predicted by wave action models (2012)
    Wiley
    Details
    Publication Date: 2012-01-31
    Description: We analyze global microseism excitation patterns between July 2000 and June 2001. Seismological observations are compared with modeling results to isolate robust activity features of relevant source processes. First, we use observations of microseism source locations estimated by Landès et al. (2010) based on array processing of ambient noise correlations. Second, we construct synthetic activity patterns by coupling sea state estimates derived from wave action models to the excitation theory for microseisms. The overall spatiotemporal evolution of both estimates is characterized by a seasonal character that is associated with strong activity during winter months. The distribution of landmass causes seasonal changes on the Northern Hemisphere (NH) to exceed the variability on the Southern Hemisphere (SH). Our systematic comparison of the two estimates reveals significant microseism excitation along coastlines and in the open ocean. Since coastal reflections are not accounted for in the modeling approach, the consistent mismatch between near-coastal observations and predictions suggests that relevant microseism energy arriving at the networks is generated in these areas. Simultaneously, systematic coincidence away from coastlines verifies the open ocean generation hypothesis. These conclusions are universal and robust with respect to the seismic network locations on the NH. The spatially homogeneous resolution of our synthetics provides a valuable resource for the assessment of the global microseism weather. Similar to previously identified hot spot areas in the North Atlantic, the modeled distributions hypothesize regions of strong localized activity on the SH, which are only partially confirmed by the analyzed data sets.
    Electronic ISSN: 1525-2027
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 5
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    Volcanology. A large magmatic sill complex beneath the Toba caldera (2014)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2014-11-02
    Description: An understanding of the formation of large magmatic reservoirs is a key issue for the evaluation of possible strong volcanic eruptions in the future. We estimated the size and level of maturity of one of the largest volcanic reservoirs, based on radial seismic anisotropy. We used ambient-noise seismic tomography below the Toba caldera (in northern Sumatra) to observe the anisotropy that we interpret as the expression of a fine-scale layering caused by the presence of many partially molten sills in the crust below 7 kilometers. This result demonstrates that the magmatic reservoirs of present (non-eroded) supervolcanoes can be formed as large sill complexes and supports the concept of the long-term incremental evolution of magma bodies that lead to the largest volcanic eruptions.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jaxybulatov, K -- Shapiro, N M -- Koulakov, I -- Mordret, A -- Landes, M -- Sens-Schonfelder, C -- New York, N.Y. -- Science. 2014 Oct 31;346(6209):617-9. doi: 10.1126/science.1258582. Epub 2014 Oct 30.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of Russian Academy of Sciences, Prospekt Koptyuga, 3, Novosibirsk, 630090 Russia. Novosibirsk State University, 2, Pirogova Street, Novosibirsk 630090, Russia. Institut de Physique du Globe de Paris, Sorbonne Paris Cite, CNRS (UMR 7154), 1 rue Jussieu, 75238 Paris, Cedex 5, France. ; Institut de Physique du Globe de Paris, Sorbonne Paris Cite, CNRS (UMR 7154), 1 rue Jussieu, 75238 Paris, Cedex 5, France. nshapiro@ipgp.fr. ; Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of Russian Academy of Sciences, Prospekt Koptyuga, 3, Novosibirsk, 630090 Russia. Novosibirsk State University, 2, Pirogova Street, Novosibirsk 630090, Russia. ; Institut de Physique du Globe de Paris, Sorbonne Paris Cite, CNRS (UMR 7154), 1 rue Jussieu, 75238 Paris, Cedex 5, France. ; GFZ German Research Centre for Geosciences, Telegrafenberg 14473 Potsdam, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25359969" 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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  • 6
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    Spatial coherence of the seismic wavefield continuously recorded by the USArray (2016)
    Wiley
    Details
    Publication Date: 2016-09-17
    Description: We use a method based on the array covariance matrix eigenvalues to study the level of spatial coherence and of isotropy of the seismic wavefield continuously recorded during 2010 by the USArray. First, we observe that the raw data is often dominated by local sources. To remove their influence, we apply spectral and temporal normalizations to the input signals. We notice that this widely-used pre-processing in ambient-noise seismology does not fully homogenize the seismic wavefield and that some strongly-coherent arrivals persist. Among these persistent signals generated by teleseismic sources we detect: (1) seismic waves emitted by strong earthquakes, (2) a nearly-continuous quasi-monochromatic signal at 26-seconds period, and (3) multi-day coherent wave trends in the spectral band of oceanic microseisms (0.07-0.2 Hz). For the latter, beamforming analysis shows that while most of the signals are composed of surface waves, some are dominated by body waves likely generated in the deep ocean.
    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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  • 7
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    Unveiling seismic and density structure beneath the Vrancea seismogenic zone, Romania (2009)
    AGU
    Details
    Publication Date: 2017-04-04
    Description: An edited version of this paper was published by AGU. Copyright (2009) American Geophysical Union
    Description: The Vrancea seismogenic zone in Romania exhibits an intense intermediate-depth seismicity, confined to a relatively small, roughly cylindrical and elongated region, whose origin is still under debate. Our three-dimensional P and S wave velocity and density images put additional physical constraints on the existing tectonic models to a depth of 200 km. The results appear to substantiate a combination of lithospheric delamination and oceanic subduction. For our analysis, we apply the tomographic inversion method of sequential integrated inversion (SII) to P and S first arrivals from active source data collected during the VRANCEA99 and VRANCEA2001 seismic refraction experiments, local earthquake data collected during the Carpathian Arc Lithosphere X-Tomography (CALIXTO) experiment and recent gravity measurements of the studied area. The reconstructed models, which explain both travel times and gravity data, show a subducting slab which exhibits fast Vp, fast Vs, high density, and a low Vp/Vs ratio consistent with the cold downgoing plate. We associate intermediate-depth seismicity with the observed sharp lateral Vp/Vs variations presumably generated by contact between the dense and cold slab and the lithospheric mantle in the shallower part or the asthenosphere in the deeper part. This contrast is particularly evident between 100 and 150 km depth, where the maximum historical seismic energy release is concentrated. Our results indicate the diagnostic power of a combined interpretation of 3-D Vp, Vs, Vp/Vs, and density models.
    Description: Published
    Description: B11307
    Description: 3.3. Geodinamica e struttura dell'interno della Terra
    Description: JCR Journal
    Description: reserved
    Keywords: joint inversion ; density ; 04. Solid Earth::04.01. Earth Interior::04.01.02. Geological and geophysical evidences of deep processes
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 8
    Electronic Resource
    Electronic Resource
    THE CARCINOSTATIC ACTIVITY OF SOME 2-AMINO-1,3,4-THIADIAZOLES (1955)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 77 (1955), S. 6713-6714 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01629a133
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    Paper (German National Licenses)
    Fulltext
  • 9
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    THE CARCINOSTATIC ACTIVITY OF SOME 2-AMINO-1,3,4-THIADIAZOLES (1955)
    American Chemical Society
    Details
    Publication Date: 1955-12-01
    Print ISSN: 0002-7863
    Electronic ISSN: 1520-5126
    Topics: Chemistry and Pharmacology
    Published by American Chemical Society
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  • 10
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    Subduction geometry of the Yakutat terrane, southeastern Alaska (2015)
    Geological Society of America (GSA)
    In: Geosphere
    Details
    Publication Date: 2015-01-29
    Electronic ISSN: 1553-040X
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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