Geophysical Investigation Of Paleoseismological Features In Eastern Arkansas, Usa,
2010
University of Arkansas Little Rock
Geophysical Investigation Of Paleoseismological Features In Eastern Arkansas, Usa, Okba Raad Al-Qadhi
Theses and Dissertations
Satellite images and field surveys reveal the existence of several liquefaction features in east central Arkansas on an area that is not known to have experienced major earthquakes in the past. The research of this dissertation is part of a long term comprehensive program to study and assess the seismic risk in the central United States. This research successfully showed that geophysical methods are effective and more economical than traditional drilling and trenching methods. Ground Penetrating Radar (GPR) and Capacitively Coupled Resistivity (CCR) techniques were comprehensively implemented at over 36 sites in the study area near Marianna, Arkansas, United States. …
Studies Of Earthquakes Stress Drops, Seismic Scattering, And Dynamic Triggering In North America,
2010
University of Texas at El Paso
Studies Of Earthquakes Stress Drops, Seismic Scattering, And Dynamic Triggering In North America, Christian Rene Escudero Ayala
Open Access Theses & Dissertations
I use the Relative Source Time Function (RSTF) method to determine the source properties of earthquakes within southeastern Alaska-northwestern Canada in a first part of the project, and earthquakes within the Denali fault in a second part. I deconvolve a small event P-arrival signal from a larger event by the following method: select arrivals with a tapered cosine window, fast fourier transform to obtain the spectrum, apply water level deconvolution technique, and bandpass filter before inverse transforming the result to obtain the RSTF. I compare the source processes of earthquakes within the area to determine stress drop differences to determine …
Seismic Investigation Of The Southern Rio Grande Rift,
2010
University of Texas at El Paso
Seismic Investigation Of The Southern Rio Grande Rift, Lennox Emmanuel Thompson
Open Access Theses & Dissertations
Competing models exist to explain what caused the Earth's crust to spread apart 29 million years ago to create a region known today as the Rio Grande Rift (RGR). The RGR extends from central Colorado through New Mexico to northern Mexico, near El Paso. The RGR has different geologic features that distinguish it from most other valleys (e.g., the RGR was not cut by a river nor does a river branch upstream). A growing body of evidence shows that geologic activity still occurs in the RGR, with a continuation of faulting, seismicity and widening at a small rate of about …
Bagc.M: Three Dimensional Gravity Modeling Software With An Application In Death Valley, Ca,
2010
University of Texas at El Paso
Bagc.M: Three Dimensional Gravity Modeling Software With An Application In Death Valley, Ca, Brian Eugene Eslick
Open Access Theses & Dissertations
Basin Anomaly Gravity Calculator (BAGC.m) is a 3D interactive gravity modeling package designed to create, edit, and calculate the gravitational attraction of basin models entirely within the MATLABTM environment. Gravity anomalies are calculated using the Rectangular Prism Method (Bott, 1960; Kane, 1962; and Plouff, 1966) which subdivides earth models into regularly spaced rectangular prisms. This approach requires large 3D matrices to store most realistic earth models. The process of model editing is simplified by storing basins as 2D gridded files which define the depth to the boundary between basement rock and sedimentary fill for each model cell. In order to …
Inversion Of 2d And 3d Dc Resistivity Imaging Data Forhigh Contrast Geophysical Regions Using Artificial Neuralnetworks.,
2010
Universiti Malaya
Inversion Of 2d And 3d Dc Resistivity Imaging Data Forhigh Contrast Geophysical Regions Using Artificial Neuralnetworks., Ahmad Neyamadpour
Student Works (2010-2019)
In electrical resistivity imaging surveys, the field data along a profile are normally acquired as a subsurface distribution of apparent resistivity. One common method to obtain the true resistivity distribution is by inverting the apparent resistivity values. However, the inversion of DC resistivity imaging data is complex due to its non-linearity. This is especially true for regions with high resistivity contrast. For the complicated subsurface structure, especially when regions of high resistivity contrast exist, a conventional inversion technique based on least squares methods may not be able to invert the DC resistivity data with adequate accuracy. Therefore, in this study, …
