ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Unknown
    Monitoring the Comprehensive Nuclear-Test-Ban Treaty: Source Location (2001)
    Basel, Boston, Berlin : Birkhäuser
    Details
    Keywords: Comprehensive Nuclear-Test-Ban Treaty ; CTBT ; monitoring ; seismic event location
    Description / Table of Contents: In September 1996, the United Nations General Assembly adopted the Comprehensive Nuclear-Test-Ban Treaty (CTBT), prohibiting nuclear explosions worldwide, in all environments. The treaty calls for a global verification system, including a network of 321 monitoring stations distributed around the globe, a data communications network, an international data centre (IDC), and on-site inspections, to verify compliance. This volume contains research papers focusing on seismic ecent location in the CTBT context. The on-site inspection protocol of the treaty specifies a search area not to exceed 1000 square km. Much of the current research effort is therefore directed towards refining the accuracy of event location by including allowances for three-dimensional structure within the Earth. The aim is that the true location of each event will lie within the specified source zone regarding postulated location. The papers in this volume cover many aspects of seismic event location, including the development of algorithms suitable for use with three-dimensional models, allowances for regional structure, use of calibration events and source-specific station corrections. They provide a broad overview of the current international effort to improve seismic event location accuracy, and the editors hope that it will stimulate increased interest and further advances in this important field.
    Pages: Online-Ressource (IV, 419 Seiten)
    ISBN: 9783764365349
    URL: http://link.springer.com/journal/24/158/1/
    Language: English
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    E-BOOK
  • 2
    Unknown
    Planning and Managing Scientific Research : A guide for the beginning researcher (2014)
    Canberra, Australia : ANU Press
    Details
    Keywords: Project Management ; Scientific Research
    Description / Table of Contents: Although there are many books on project management, few address the issues associated with scientific research. This work is based on extensive scientific research and management experiences and is designed to provide an introduction to planning and managing scientific research for the beginning researcher. The aim is to build an understanding of the nature of scientific research, and the way in which research projects can be developed, planned and managed to a successful outcome. The book is designed to help the transition from being a member of a research team to developing a project and making them work, and to provide a framework for future work. The emphasis of the book is on broadly applicable principles that can be of value irrespective of discipline. It should be of value to researchers in the later stages of Ph.D. work and Postdoctoral workers, and also for independent researchers.
    Pages: Online-Ressource (IX, 93 Seiten)
    ISBN: 9781925021592
    URL: http://press.anu.edu.au?p=277501
    Language: English
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    E-BOOK
  • 3
    facet.materialart.
    Unknown
    Global azimuthal seismic anisotropy and the unique plate-motion deformation of Australia (2005)
    In:  Nature, London, Army Corps of Engineers, Woodward-Clyde Consultants, vol. 433, no. 7025, pp. 509-512, pp. B12307, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 2005
    Description: ... We infer that the fast-moving Australian plate contains the only continental region with a sufficiently large deformation at its base to be transformed into azimuthal anisotropy. Simple shear leading to anisotropy with a plunging axis of symmetry may explain the smaller azimuthal anisotropy beneath other continents.
    Keywords: Anisotropy ; Plate tectonics ; earth mantle ; Seismology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    BIBLIOGRAPHY SEISMOLOGY
  • 4
    facet.materialart.
    Unknown
    Lg wave propagation in the area around Japan: observations and simulations (2014)
    SpringerOpen
    Details
    Publication Date: 2014-05-23
    Description: Regional wavefields are strongly influenced by crustal structure heterogeneity variations along their propagation paths. Observations of such effects between the Asian continent and the Japanese subduction zone across the Sea of Japan (East Sea) have been strongly assisted recently by the development of high-density seismic networks in Japan and Korea, as well as the supercomputer-based three-dimensional finite difference method seismic wave propagation simulations using detailed heterogeneous crustal models. In this study, an Lg propagation map derived from 289,000 ray paths connecting sources to observation stations reveals efficient Lg wave propagation from continental Asia to Kyushu through the Korean Peninsula, and to Hokkaido, thus indicating a laterally consistent crustal structure extending from continental Asia to Japan. However, the Lg wave propagation to the Japanese main island of Honshu is totally blocked as it crosses the continental-oceanic boundary surrounding the Sea of Japan. Three-dimensional (3-D) finite-difference method seismic wave propagation simulations performed using a detailed crustal structural model allow us to clearly visualize the way in which an Lg wave develops from a shallow source in the crust and its propagation in the crustal waveguide by means of multiple post-critical S wave reflections in the continental structure. The sudden thinning of the continental crust at the edge of the Asian continent adjacent to the oceanic crust in the Sea of Japan, which involves a thickness change from 30 to 10 km within a 100-km distance (with the thinner crust extending over 600 km), decreases the Lg wave energy by 10%. It has been confirmed that 50% of this Lg wave energy loss occurs during wave passage along the thinner crust and that the other 50% results from conversion into P energy in the overlying seawater.
    Electronic ISSN: 2197-4284
    Topics: Geosciences , Physics
    Published by SpringerOpen
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 5
    Electronic Resource
    Electronic Resource
    Reflection seismograms in a 3-D elastic model: an isochronal approach (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 99 (1989), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The reflection and diffraction of elastic waves by surfaces in three dimensions and scattering by thin scatterers can be combined in a common formulation. This approach is derived by using an integral formulation of the elastic wavefield together with ray approximations for wave propagation between source or receiver and reflecting surface or scatterer. For a scatterer, first order scattering is assumed and at a reflecting surface, reflection and transmission effects are estimated using the assumption of a locally plane interface. With these approximations, the reflected seismic field can be represented as the convolution of an approximate source function with a weight function for a particular source and receiver configuration. The weight function at a particular time may be evaluated by a contour integral along the isochronal curve for which the total time from source to receiver via points along the curve on the reflecting surface or on the median surface of the scatterer is equal to the specified time. The kernel of this integral contains information on the scattering or reflection coefficients for the incident wave, the angular effects of the incoming and outgoing waves with respect to the surface normal and the speed of advance of the isochron on the surface. By transfering temporal derivatives to the source function in the convolution, a very stable numerical scheme can be formulated for the generation of synthetic seismograms. This method is illustrated by the calculation of P-P reflections for a seismic line oblique to an anticline and for a variety of parameter contrasts for a simple scatterer model. Reflections from multilayered models can be generated for one surface at a time and the effect of a number of scatterers will be additive within the first order approximation employed. The facility to calculate theoretical seismograms for both surface reflections and scattering is exploited to look at the nature of reflection from the crust-mantle boundary in three dimensions. Very similar seismic responses are obtained for the P-waves returned from an irregularly corrugated Moho surface and a model of the crust-mantle transition as a set of scatterers in the lowermost crust with mantle properties. Thus with current resolution there will be inherent ambiguities in interpretations of the character of the crust mantle transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1989.tb02015.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    A 2.5-D Time-Domain Elastodynamic Equation For Plane-Wave Incidence (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 125 (1996), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Full 3-D modelling of seismic wave propagation is still computationally intensive. Recently, as a compromise between realism and computational efficiency, two-and-a-half-dimensional (2.5-D) methods for calculating 3-D elastic wavefields in media varying in two dimensions have been developed. Such 2.5-D methods are an economical approach for calculating 3-D wavefields, and require a storage capacity only slightly larger than those of the corresponding 2-D calculations.In this paper, a 2.5-D elastodynamic equation in the time domain is constructed for seismic wavefields in models with a 2-D variation in structure but obliquely incident plane waves. the approach does not require wavenumber summation, and as a result requires much less computation time than in previous techniques. the modelling of such seismic wavefields for a 2.5-D situation with an incident plane wave is of considerable practical importance: for example, this approach can be applied to the modelling of the local response of an irregular basin structure, or to teleseismic body waveforms from shallow earthquakes occurring in subduction zones, where the laterally heterogeneous medium can have a large effect on the waveform.All the variables in the 2.5-D time-domain elastodynamic equation are real-valued, so the propagation characteristics can be efficiently calculated using 2-D time-domain numerical techniques such as the finite-difference method or the pseudospectral method with less computation time and memory than for other implementations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1996.tb00001.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    A 2.5-D time-domain elastodynamic equation for a general anisotropic medium (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 127 (1996), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: In order to provide a quantitative analysis of real seismic records from complex regions we need to be able to calculate the wavefields in three dimensions. However. full 3-D modelling of seismic-wave propagation is still computationally intensive. An economical approach to the modelling of seismic-wave propagation which includes many important aspects of the propagation process is to examine the 3-D response of a model where the material parameters vary in two dimensions. Such a configuration, in which a 3-D wavefield is calculated for a 2-D medium, is called the “2.5-D problem”. Recently. Takenaka & Kennett (1996) proposed a 2.5-D time-domain elastodynamic equation for seismic wavefields in models with a 2-D variation in structure but obliquely incident plane waves in the absence of source. This approach is useful even for non-plane waves. In the presence of source a new 2.5-D elastodynamic equation for general anisotropic media can be derived in the time domain based on the Radon transform over slowness in the direction with constant medium properties. The approach can also be formulated in terms of velocity—stress, a representation which is well suited to the use of numerical techniques for 2-D time-domain problems such as velocity—stress finite-difference or velocity—stress pseudospectral techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1996.tb04716.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    A low velocity zone underlying a fast-spreading rise crest (1975)
    [s.l.] : Nature Publishing Group
    Nature 256 (1975), S. 475-476 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Many surveys have been made of the structure in the neighbourhood of slow spreading ridges, particularly the Mid-Atlantic Ridge, but very little work has been done on fast spreading ridges. Two surveys2'3 on the East Pacific Rise near the area of this work show mantle velocities below 8 km s"1. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/256475a0
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Global azimuthal seismic anisotropy and the unique plate-motion deformation of Australia (2005)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 433 (2005), S. 509-512 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Differences in the thickness of the high-velocity lid underlying continents as imaged by seismic tomography, have fuelled a long debate on the origin of the ‘roots’ of continents. Some of these differences may be reconciled by observations of radial anisotropy between 250 and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature03247
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Geophysics: A new way to estimate seismic source parameters (1983)
    [s.l.] : Nature Publishing Group
    Nature 302 (1983), S. 659-660 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SINCE the turn of the century, seismology has provided the bulk of the quantitative information about the Earth's interior. As instrumentation and theory have progressed, the aim has been to make the maximum use of the wavetrains recorded at each seismographic station. In studies of moderate-size ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/302659a0
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...