Spelling suggestions: "subject:"seismic waves."" "subject:"eismic waves.""
171 |
Efficient repeat-modelling of time-lapse seismograms for reservoir monitoring /Kirchner, Andreas, January 2001 (has links) (PDF)
Thesis (Doctoral)--Universität Karlsruhe, 2000. / Abstract in German. Hochschulschrift = Thèse/Mémoire. Also available via the World Wide Web. http://www.ubka.uni-karlsruhe.de/cgi-bin/psview?document=2001/physik/2
|
172 |
Velocity estimation from seismic data by nonlinear inversion and characterization of gas hydrate deposits offshore OregonWang, Chengshu 28 August 2008 (has links)
Not available / text
|
173 |
Seismic wave propagation through flood basalts and stratigraphic correlation on the Faroes shelfSchuler, Juerg January 2013 (has links)
No description available.
|
174 |
Temporal change of seismic velocity and site response for different scales and implications for nonlinearityWu, Chunquan 10 July 2007 (has links)
This thesis consists of two major parts. In the first part, I monitor the temporal change of S-wave velocity in shallow soil layers using seismic data collected in an experiment at Panola Mt. Atlanta, GA, 2006. I use the cross correlation function to find the arrival time differences for different water levels, and then calculate the change of Rayleigh wave phase velocity according to different frequencies in the range 5 to 50 Hz. After that, I find a reference 1-D layered P and S-wave velocity model from the measured Rayleigh wave dispersion curve, and put 6 sets of Gaussian perturbations into the reference velocity structure to invert for the actual temporal change of velocity structure in the experiment. I find a clear increase of S-wave velocity in the water injection area, and the S-wave velocity gradually recovers to the initial value after we stop pumping water.
In the second part, I analyze temporal changes in fault zone site response along the Karadere-Düzce branch of the North Anatolian Fault, starting 8 days before and ending 72 days after the 1999 Mw7.1 Düzce, Turkey, earthquake. The analysis involves comparisons of strong motion seismic records at station VO inside the Karadere fault and station FP about 300 m away from the fault. I compare all available seismic waveforms at these stations, including those generated by foreshocks, the mainshock, aftershocks and seismic noise, and cut them into 10 s windows with a 5 s overlap. Fourier amplitude spectra are computed for seismic data in each window, and the average amplitude spectra for the two horizontal components are used to obtain the spectral ratio for each on/off fault pair of seismic records. The spectral ratios are smoothed over every 10 points in the frequency domain (0.5 Hz). The results show a shift of the spectral peak to lower frequencies during the main shock. The peak frequency reduces from 4.3 Hz several days before the main shock to 2.9 Hz (67.4% of the pre mainshock value) right after the mainshock. It quickly recovers to 3.8 Hz (64% recovery of the dropped value) after a day, and then gradually recovers to 4.0 Hz (79% recovery of the dropped value) after 72 days. I also compare the results from all the seismic data including direct S-wave, S coda waves and seismic noise and from coda waves only and find that the results from coda waves which are generally less scattered than those from all the data, and show lower amplitude of spectra ratio with higher peak frequencies. The observations suggest a nonlinear behavior of the fault zone material under strong ground motion of nearby major earthquakes.
Finally I attempt to link the two parts by identifying their implications for the nonlinear site effects.
|
175 |
Field experiments for fracture characterization studies of seismic anisotropy and tracer imaging with GPR /Bonal, Nedra Danielle, January 1900 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2007. / Vita. Includes bibliographical references.
|
176 |
An integrated damping and strengthening strategy for performance-based seismic design and retrofit of highway bridgesKarim, Kazi Rezaul, January 2009 (has links) (PDF)
Thesis (M.S.)--Missouri University of Science and Technology, 2009. / Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed April 13, 2009) Includes bibliographical references.
|
177 |
In-situ subsurface density estimations using a seismic techniqueFourie, Christoffel Johannes Stephanus. January 2008 (has links)
Thesis (Ph.D.(Exploration Geophysics))--University of Pretoria, 2007. / Abstract in English. Includes bibliographical references (leaves 72-76).
|
178 |
Seismic structure of the Arava Fault, Dead Sea Transform /Maercklin, Nils, January 1900 (has links)
Thesis (doctoral)--Universität Potsdam, 2004. / "September 2004"--P. [2] of cover. Vita. Includes bibliographical references (p. [115]-132). Also available via the World Wide Web.
|
179 |
Determination of in situ V[subscript s] and G[subscript max] using surface wave measurements in cased and uncased boreholes /Kalinski, Michael E. January 1998 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 1998. / Vita. Includes bibliographical references (leaves 401-406). Available also in a digital version from Dissertation Abstracts.
|
180 |
Prestack split-step fourier depth migration algorithms and parallel implementations on Cray T3E /Tanis, Mehmet Celaleddin, January 1998 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 1998. / Vita. Includes bibliographical references (leaves 181-191). Available also in a digital version from Dissertation Abstracts.
|
Page generated in 0.3824 seconds