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  • 1
    Publikationsdatum: 1983-11-14
    Print ISSN: 0031-9007
    Digitale ISSN: 1079-7114
    Thema: Physik
    Publiziert von American Physical Society
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 1969-03-01
    Print ISSN: 0021-8979
    Digitale ISSN: 1089-7550
    Thema: Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    facet.materialart.
    Unbekannt
    PANGAEA
    In:  Supplement to: Muller, M R; Robinson, Carlos J; Minshull, Tim A; White, R S; Bickle, Michael J (1997): Thin crust beneath ocean drilling program borehole 735B at the Southwest Indian Ridge? Earth and Planetary Science Letters, 148(1-2), 93-107, https://doi.org/10.1016/S0012-821X(97)00030-7
    Publikationsdatum: 2023-05-12
    Beschreibung: A wide-angle seismic experiment at the Atlantis II Fracture Zone, Southwest Indian Ridge, together with geochemical analyses of dredged basalt glass samples from a site conjugate to Ocean Drilling Program hole 735B has allowed determination of the thickness and the most likely lithological composition of the crust beneath hole 735B. The measured Na, composition of 3.3 +/- 0.1 corresponds to a melt thickness of 3 +/- 1 km, a result consistent with rare earth element inversions which indicate a melt thickness of between 1.5 and 4.5 km. The seismic crustal thickness to the north and south of the Atlantis Platform (on which hole 735B is located) is 4 +/- 1 km, and probably consists largely of magmatic material since the seismic and inferred melt thicknesses agree within experimental uncertainty. Beneath hole 735B itself. the Moho is at a depth of 5 +/- 1 km beneath the seafloor. The seismic model suggests that, on average. about 1 km of upper crust has been unroofed on the Atlantis Platform. However, allowing for the inferred local unroofing of 2 km of upper crust at 735B, the base of the magmatic crust beneath this location is probably about 2 km beneath the seafloor, and is underlain by a 2-3 km thick layer of serpentinised mantle peridotite. The P-wave velocity of 6.9 km/s for the serpentinised peridotite layer corresponds to a 35 +/- 10 vol% serpentine content. The Moho beneath hole 735B probably represents a serpentinisation front.
    Schlagwort(e): Aluminium oxide; Aluminium oxide, standard deviation; Calcium oxide; Calcium oxide, standard deviation; Cerium; Cerium, standard deviation; Chromium(III) oxide; Chromium(III) oxide, standard deviation; DEPTH, sediment/rock; Dysprosium; Dysprosium, standard deviation; Electron microprobe (EMP); Erbium; Erbium, standard deviation; Europium; Europium, standard deviation; Gadolinium; Gadolinium, standard deviation; Holmium; Holmium, standard deviation; Iron oxide, Fe2O3; Iron oxide, FeO; Iron oxide, FeO, standard deviation; Lanthanum; Lanthanum, standard deviation; LATITUDE; LONGITUDE; Lutetium; Lutetium, standard deviation; Magnesium number; Magnesium oxide; Magnesium oxide, standard deviation; Manganese oxide; Manganese oxide, standard deviation; Neodymium; Neodymium, standard deviation; Phosphorus pentoxide; Phosphorus pentoxide, standard deviation; Potassium oxide; Potassium oxide, standard deviation; Praseodymium; Praseodymium, standard deviation; Samarium; Samarium, standard deviation; Sample code/label; Silicon dioxide; Silicon dioxide, standard deviation; Sodium oxide; Sodium oxide, standard deviation; Terbium; Terbium, standard deviation; Thulium; Thulium, standard deviation; Titanium dioxide; Titanium dioxide, standard deviation; Ytterbium; Ytterbium, standard deviation
    Materialart: Dataset
    Format: text/tab-separated-values, 310 data points
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Publikationsdatum: 2017-04-04
    Beschreibung: We are concerned with the detection and location of small seismic events, such as can be encountered in monitoring hydro-fracturing with surface sensors. Ambient seismic noise is the main problem in detection of weak seismic phases from these events, particularly as the sites of interest are often within or near producing fields. Band-pass filtering and stacking are the most widely used techniques for enhancing the signal-to-noise ratio (SNR) in passive seismic experiments, but they are of limited value when noise and signal share the same frequency band. Seismic arrays can be used to reduce the unwanted noise (e.g., traffic noise, pumping noise, scattering ground roll) by delay-and-sum techniques (also called beamforming) or by frequencywavenumber filtering. Beamforming maximizes the array response for the assumed direction and slowness of the signal. Whereas in some situations it can be highly effective, and the azimuth and slowness of the signal can be determined by a grid search approach, it is vulnerable to contamination by side-lobe energy, particularly for broadband signals and noise (Rost and Thomas, 2002). Frequencywavenumber filtering can be very effective but requires regularly spaced arrays and implicitly assumes plane-wave propagation. Both methods perform poorly when the waveform changes significantly between stations of the array, as might be caused, for example, by differences in site response. In this article, we present a multichannel Wiener filtering technique, which allows the removal of coherent noise from three-component 2D arrays without making a priori assumptions about the mode of propagation (e.g., no planewave assumption is required for the noise field). We test the effectiveness of this filter with two case studies. In the first case, we add synthetic signals of varying strengths to actual noise data recorded with a hexagonal array during hydrofracturing within a producing oil field in Wyoming, USA. Using this test, we are able to provide estimates of the smallest event detectable with the filtered data, and compare the results with conventional techniques, such as stacking. The second test case is a dense, small-aperture 2D seismic array of 95 stations placed within an area of 130 m 56 m on a landslide deposit in the Northern Apennines, Italy. Numerous microearthquakes have been recorded with this array, whose faint P-phases serve as an ideal data set for testing filtering techniques. Using the two case studies, we discuss the effectiveness of the multichannel Wiener filter on SNR improvement, and show that including horizontal components into the analysis increases the SNR improvement more than using only vertical components.
    Beschreibung: Acknowledgments: We thank Schlumberger Cambridge Research for providing funding for this project and for the hydrofracture surface monitoring experiment. However, the views expressed here are those of the authors, who are solely responsible for any errors. For the hydrofracture surface data, we thank the Schlumberger office in Rock Springs, Wyoming, for help with logistics and deployment, BP for permission to deploy seismometers on one of their fields, Anna Horleston and Sharif Aboelnaga for assistance in the field, and SEIS-UK for the loan of the seismometers. The Cavola data were acquired by the Istituto Nazionale di Geofisica e Vulcanologia, Italy. We thank the Cavola Experiment Team, particularly John Haines (University of Cambridge), Giuliano Milana, Giuseppe Di Giulio and Fabrizio Cara (Istituto Nazionale di Geofisica e Vulcanologia). Ed Kragh and Everhard Muyzert provided helpful advice. University of Cambridge, Department of Earth Sciences contribution No. ES9031.
    Beschreibung: Published
    Beschreibung: 232-238
    Beschreibung: 1.1. TTC - Monitoraggio sismico del territorio nazionale
    Beschreibung: N/A or not JCR
    Beschreibung: partially_open
    Schlagwort(e): seismic noise ; Wiener filters ; 04. Solid Earth::04.06. Seismology::04.06.10. Instruments and techniques
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Publikationsdatum: 2017-04-04
    Beschreibung: Hydraulic-fracture induced microseismic events are usually small, and noise levels are high at the surface due to the activities associated with a producing oil field. Similarly, local arrays for the detection of local earthquakes will also benefit from reduced noise levels and detect smaller events. We present a frequency-dependent multi-channel Wiener filtering technique with linear constraints, which employs an adaptive least-squares technique to remove coherent noise in seismic array data. The noise records on a number of reference channels is used to predict the noise on a primary channel, which can then be subtracted. We implement and test first an unconstrained version of this filter, where maximal noise suppression can lead to signal distortion. Two methods of imposing constraints are then introduced to achieve signal preservation. We test this technique with two case studies. First, synthetic signals are added to actual noise from a pilot deployment of a hexagonal array (9 three-component seismometers, approximate size 150 m × 150 m) in an oil field; noise levels are suppressed by up to 11 dB (at 1 - 6 Hz). Secondly we use natural seismicity recorded at a dense array (∼10 m spacing) in Italy where the application of the filter reduces the signal-to-noise ratio by more than 20 dB (at 8 - 15 Hz), using 35 stations. In both cases, the performance of the multi-channel Wiener filters is significantly better than stacking, especially at lower frequency where stacking does not help to suppress the coherent noise. The unconstrained version of the filter yielded the best improvement in the signal-to-noise ratio, but the constrained filter is useful when waveform distortion is not acceptable.
    Beschreibung: Published
    Beschreibung: v133-v141
    Beschreibung: 1.11. TTC - Osservazioni e monitoraggio macrosismico del territorio nazionale
    Beschreibung: JCR Journal
    Beschreibung: open
    Schlagwort(e): Weiner filters, noise suppression, cavola array ; 01. Atmosphere::01.01. Atmosphere::01.01.08. Instruments and techniques
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    facet.materialart.
    Unbekannt
    In:  EPIC3Geophysical Research Letters, 28(8), pp. 1615-1618, ISSN: 0094-8276
    Publikationsdatum: 2019-07-17
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Publikationsdatum: 2022-05-04
    Beschreibung: A recent analysis of the Fermi Large Area Telescope data provided evidence for a high-intensity emission of high-energy gamma rays with a E 2 spectrum from two large areas, spanning 50 above and below the Galactic centre (the ‘‘Fermi bubbles’’). A hadronic mechanism was proposed for this gamma-ray emission making the Fermi bubbles promising source candidates of high-energy neutrino emission. In this work Monte Carlo simulations regarding the detectability of high-energy neutrinos from the Fermi bubbles with the future multi-km3 neutrino telescope KM3NeT in the Mediterranean Sea are presented. Under the hypothesis that the gamma-ray emission is completely due to hadronic processes, the results indicate that neutrinos from the bubbles could be discovered in about one year of operation, for a neutrino spectrum with a cutoff at 100 TeV and a detector with about 6 km3 of instrumented volume. The effect of a possible lower cutoff is also considered.
    Beschreibung: Published
    Beschreibung: 7–14
    Beschreibung: 1.8. Osservazioni di geofisica ambientale
    Beschreibung: JCR Journal
    Beschreibung: restricted
    Schlagwort(e): Neutrino telescope ; Fermi Bubbles ; KM3NeT ; 03. Hydrosphere::03.03. Physical::03.03.05. Instruments and techniques
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    ISSN: 1520-510X
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 1 (1953), S. 878-878 
    ISSN: 1520-5118
    Quelle: ACS Legacy Archives
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 5 (1957), S. 123-127 
    ISSN: 1520-5118
    Quelle: ACS Legacy Archives
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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