Geophysics Seminar: Modern Topics in Tectonophysics (EAS8001A)
Fall, 2005
Course Syllabus | |
A couple of refrences from class on 8/24/05
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Bob Lowell will be leading discussion of fluids in Mid-Ocean Ridges on 8/31/05
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Aseismic Slip
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Sumatran Earthquake, Revisited
Please read the following paper and supplemental information in preparation for discussion on 9/14. This is a short paper and should be easily finished by class on Wednesday. If interested, there are several other papers in that issue of Science on the Sumatran Earthquake that are worth reading.
"A Scattering Inversion Experiment to Identify Scatterers on a Granite Outcrop" Abstract: The purpose of this study was to develop a non-invasive technique for identifying scatterers on a granite outcrop. We conducted our investigation at Panola Mountain Research Watershed. 16 geophones, 100Hz each, were placed in a circular array with aperture of 15m. A simple weight-drop source was moved around the array at distances of 10 to 50m. We recorded seismic waves in the range of 100 to 1000Hz. Sand bags and clay had to be used to achieve good coupling between the geophones and the rock. The semblance coefficient was used to look for sources of coherent energy. It was calculated as a function of time, back azimuth and velocity. Our results show an area of strong surface scatterers that correlates well with the surface peculiarities of the field area and the location of a small creek. We obtained a 3D image of scatterers down to a depth of 55m. | |
Continued discussion of Lay et al Sumatra paper (9/21/05) | |
Introduction to Unix and Shell scripts (9/21/05)
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Introduction to GMT scripting (9/28/05) | |
Informal Discussion of the October 8, 2005 Pakistani Earthquake (10/12/05)
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Rheologic Modeling of Transient Deformation(10/26/05) We discussed ongoing modeling of the suite of deformation information (GPS, InSAR and EDM) from Long Valley Caldera's recent magmatic and seismic unrest. We discussed types of models and the limits of elastic techniques.
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Soccoro Magma Body (11/02/05) Today we had a presentation and discussion of ongoing reserach over the Socorro Magma Body in New Mexico. This included the early seismic (identification) and geodetic studies (leveling, InSAR, EDM, and GPS) and ongoing GPS studies.
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