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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

A broadband electromagnetic induction study of the Travale geothermal field, Italy

Devlin, Teresa January 1984 (has links)
No description available.

Shear-wave splitting in cross-hole seismology and channel waves in anisotropic waveguides

Liu, Enru January 1989 (has links)
No description available.

The location of local earthquakes in a zone of anisotropy

Doyle, Mark A. January 1982 (has links)
No description available.

Propagation and attenuation of seismic Rayleigh waves along single paths in Scotland

Macbeth, Colin D. January 1983 (has links)
No description available.

Statistics of large earthquake magnitude and an evaluation of Greek seismicity

Makropoulos, K. C. January 1978 (has links)
No description available.

Excavation induced seismicity in granite rock : a case study at the underground research laboratory, Canada

Collins, David Stephen January 1997 (has links)
This study presents a detailed investigation into the microseismic response of a rockmass being excavated in a high stress environment. AECL's Underground Research Laboratory, Manitoba, provided a unique opportunity to non-invasively monitor a tunnel excavation with a 3D microseismic array. The 46 m long cylindrical Mine-by tunnel was excavated at 420 m depth predominantly using a non-blasting method, therefore the damage zone and crack initiation is primarily due to the effect of stress redistribution and concentration following each excavation increment. Both manual and automated source parameter processing techniques are contrasted and used on the data set of over 20000 microseismic events of magnitude, MW =-1.5 to - 4.5. The relatively homogeneous and unfractured nature of the rockmass allowed the validity of fundamental spectral models to be tested. The seismicity is found to extend 1.0 m into the roof and floor regions of the tunnel and 0.8 m ahead of the tunnel face. Spatial and temporal trends in the source parameters are used to compare the seismic response of the two rock types present along the tunnel, namely granite and granodiorite. Seismicity starts earlier and occurs over a shorter time interval in the granite. Additionally, a late second phase of seismicity is found to occur in the granodiorite with these events having a similar magnitude to those at the excavation face. These trends, due to petrofabric and geotechnical differences in the two rock types, are important for safety reasons and mine design. The excellent sensor focal sphere coverage enabled the production of well constrained source mechanism solutions using both first motions and moment tensor analysis methods, and allowed source types to be contrasted with spectral parameters. Seismicity ahead of the tunnel face is predominantly deviatoric and it is concluded that this source type is resulting from movement on face parallel tensile cracks that formed early during the tunnel excavation

Seismic studies of small ocean basins and zones of crustal accretion

Joppen, Mathias January 1989 (has links)
No description available.

On the scattering of seismic waves

Coates, Richard T. January 1990 (has links)
No description available.

Seismic studies over continental margins

Morgan, Joanna Victoria January 1988 (has links)
No description available.

Parabolic approximations for seismic disturbances in laterally varying structures

Haines, A. J. January 1983 (has links)
No description available.

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