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Analysis of water monitoring data for longwall panelsZirkle, Joseph R. January 1900 (has links)
Thesis (M.S.)--West Virginia University, 2007. / Title from document title page. Document formatted into pages; contains ix, 89 p. : ill. (some col.), col. maps. Vita. Includes abstract. Includes bibliographical references (p. 86).
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Late Holocene environments and earthquakes in southern Puget Sound /Sherrod, Brian Louis. January 1998 (has links)
Thesis (Ph. D.)--University of Washington, 1998. / Vita. Includes bibliographical references (leaves [140]-149).
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Characterizing the deformation of reservoirs using interferometry, gravity, and seismic analysesSchiek, Cara Gina. January 2009 (has links)
Thesis (Ph. D.)--University of Texas at El Paso, 2009. / Title from title screen. Vita. CD-ROM. Includes bibliographical references. Also available online.
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Deformation monitoring using scanning synthetic aperture radar interferometryGudipati, Krishna Vikas, January 1900 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2009. / Title from PDF title page (University of Texas Digital Repository, viewed on Sept. 15, 2009). Vita. Includes bibliographical references.
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EARTH-FISSURE MOVEMENTS IN SOUTH-CENTRAL ARIZONA, U.S.A. (UNITED STATES)Boling, James Keith, 1949- January 1987 (has links)
Ground-water pumping has led to subsidence and many earth fissures in unconsolidated alluvial basins in Arizona. Earth fissures result from tensile failure; however, mechanisms producing the tensile forces are not well understood. Horizontal displacement measurements (opening and closing) of seven earth fissures were made semi-monthly during 1976 to 1982 in the lower Santa Cruz Basin and Avra Valley. Permanent and temporary short-base extensometers with a resolution of ±2.54 μm were developed and perfected which use dial gauges and transducers. Among different fissure movements, the greatest total was 41.44 mm, the greatest single opening was 31 mm, and exclusive of that, the greatest net opening was 16.54 mm. Fissures opened and closed repeatedly, exhibiting smooth movements over long periods of time, punctuated by sudden jumps. Generally, old and new earth fissures exhibited similar behavior. Earth fissures tend to close after long, dry periods and to open after heavy rainfalls. The earth fissure with the greatest movement was closest to the area of the greatest subsidence.
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A study of subsidence due to mining by block caving, San Manuel Mine, Pinal County, ArizonaMcLehaney, James Dewey, 1928- January 1958 (has links)
No description available.
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Geophysical strain and tilt : measurement methodology and analysis of dataMacKay, Robert 01 January 1983 (has links)
Tilt and strain meters were installed on the Portland State University campus in the summer of 1982 and data was collected for 4 months. Instrument selection, operation, installation and performance are discussed.
Suggestions that could enhance data quality and data collection efficiency are presented.
An analysis procedure is suggested and an example of this procedure for an interval of data is discussed. The influence of the temperature, pressure, rainfall and solid earth tides on the signal is investigated, as well as the correlation between similar channels of the different tilt instruments. The temperature, rainfall and solid earth tides were all determined to have an influence on the instruments. A statistical test of the influence of the barometric pressure on the signal revealed no significant influence. A very low correlation between similar components of the different tilt instruments was observed aside from their thermal dependence. It was concluded that in order to obtain high quality data for the use in quantitative calculations, the temperature influence on the raw record must be minimized.
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Coastal Crossing of the Elastic Strain Zero-Isobase, Cascadia Margin, South Central Oregon CoastBriggs, Gregory George 03 August 1994 (has links)
The analysis of marsh cores from the tidal zones of the Siuslaw, Umpqua, and Coos River systems on the south-central Oregon coast provides supporting evidence of coseismic subsidence resulting from megathrust earthquakes and reveals the landward extent of the zero-isobase. The analysis is based on lithostratigraphy, paleotidal indicators, microfossil paleotidal indicators, and radiocarbon age. Coseismic activity is further supported by the presence of anomalous thin sand layers present in certain cores. The analysis of diatom assemblages provides evidence of relative sea-level displacement on the order of 1 to 2 m. The historic quiescence of local synclinal structures in the Coos Bay area together with the evidence of prehistoric episodic burial of wetland sequences suggests that the activity of these structures is linked to megathrust releases. The distribution of cores containing non-episodically buried marshes and cores that show episodically buried wetlands within this area suggests that the landward extent of the zero-isobase is between 100 km and 120 km from the trench. The zero-isobase has a minimum width of 10 to 15 km. Radiocarbon dating of selected buried peat sequences yields an estimated recurrence interval on the order of 400 years. The apparent overlapping of the landward margin of both the upperplate deformation zone (fold and/or thrust fault belt) and the landward extent of the zero-isobase is interpreted to represent the landward limit of the locked zone. The earthquake magnitude is estimated to be 8.5 based on an arbitrary rupture length of 200 km and a locked zone width of 105 km. The identification of the zero-isobase on the southcentral Oregon coast is crucial to the prediction of regional coseismic subsidence and tsunami hazards, the testing of megathrust dislocation models, and the estimation of megathrust rupture areas and corresponding earthquake magnitudes in the Cascadia Margin.
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Structure and seismic hazards of the offshore Cascadia forearc and evolution of the Neogene forearc basinMcNeill, Lisa C. 12 October 1998 (has links)
The Cascadia subduction zone has been characterized as a typical Chilean-type
subduction zone based on qualitative comparisons of plate age and convergence rate, with
simple forearc structure. However, the discovery of unusual structural styles of
deformation, variations in the morphology of the forearc, and its absence of seismic activity
suggest differences from the Chilean analog. The manuscripts presented here (McNeill et
al., 1997, in press, submitted) illustrate this complexity and provide examples of
contrasting deformation throughout the offshore forearc. The Washington and northern
Oregon shelf and upper slope are characterized by extension in the form of listric normal
faults. These faults have been active since the late Miocene and are driven by detachment
and extension of the underlying overpressured m��lange and broken formation. This region
of the forearc is partly to wholly decoupled from convergence-driven compression which
dominates deformation elsewhere in the forearc. One exception to convergence-driven
compression is a region of N-S compression of the inner shelf and coastal region which
reflects the regional stress field. N-S compressional structures apparently influence the
positions of coastal lowlands and uplands and may contribute to the record of coastal marsh
burials interepreted as the result of coseismic subsidence during subduction zone
earthquakes. Modeling of subduction zone earthquake characteristics based on marsh
stratigraphy is likely to be inaccurate in terms of rupture zone position, magnitude, and
recurrence interval. The Cascadia shelf and upper slope are underlain by a sequence of
deformed basinal strata which reflects the tectonic evolution of the margin. The surface of
a regional late Miocene angular unconformity (7.5-6 Ma: a global hiatus) indicates
deformation by uplifted submarine banks and subsided synclines (coincident with low
recent uplift onshore), which control the current shelf break position. The basin is
currently filled behind a N-S-trending outer-arc high, which uplifted in the early-middle Pliocene following truncation and erosion of the seaward edge of the basin. Breaching of the outer-arc high occurred in the early Pleistocene leading to the formation of the Astoria Submarine Fan and increased growth rates of the accretionary wedge. / Graduation date: 1999
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Deformation monitoring using scanning synthetic aperture radar interferometryGudipati, Krishna Vikas, 1979- 16 October 2012 (has links)
This dissertation provides the first demonstration of scanning synthetic aperture radar (ScanSAR) advanced interferometry processing for measuring surface deformation. ScanSAR data are synthesized from ERS-1/2 stripmap SAR images over known deformation in Phoenix, Arizona. The strategy is to construct a burst pattern similar to Envisat ScanSAR data and to create a realistic variable-burst synchronization scenario in which any image pair has at least 50% burst overlap. The Small Baseline Subsets technique is applied to the synthesized data to demonstrate ScanSAR time series analysis for a scenario generally conducive for interferometry. The same processing approach is employed with the stripmap data to validate the results. The differences in ScanSAR and stripmap velocities have a mean and standard deviation of 0.02±0.02 cm/year. 96.3% and 99.1% of the velocity differences are within ±0.1 cm/year and ±0.2 cm/year, respectively. The RMS deviations between the ScanSAR and stripmap displacement estimates are 0.40±0.30 cm. 68.5% and 94.6% of the differences are within ±0.5 cm and ±1.0 cm, respectively. The Permanent Scatterer (PS) technique also is adapted and applied to the synthesized data to demonstrate the presence of PS in ScanSAR data. The atmospheric and nonlinear motion phase derived from a PS analysis of stripmap data are removed from the ScanSAR interferograms. Even for this idealized scenario, the final PS identification yields fewer ScanSAR PS (10 PS/km²) than the stripmap PS results (312 PS/km² or 15.6 PS/km² at the ScanSAR pixel resolution). Based on the calculated likelihood of finding multiple stripmap PS within a ScanSAR pixel, it is concluded that the ScanSAR single scatterer PS model is flawed. A model is introduced that considers multiple PS within a ScanSAR pixel. The search for two PS per pixel yields 120 PS/km². The ScanSAR and stripmap PS velocity differences mean is zero and standard deviation is 0.02 cm/year. However, while the differences between the ScanSAR and stripmap PS DEM error estimates are zero-mean, they have a 7-meter standard deviation. One possible explanation for this relatively large deviation is the differencing of the wrong ScanSAR and stripmap PS as the result of a misalignment between the ScanSAR and stripmap images. / text
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