Geophysics Seminar: Modern Topics in Tectonophysics (EAS8001A) Fall, 2005
Course Syllabus
A couple of refrences from class on 8/24/05
  • Here is the figure that we were talking about:
  • Go to to download and play with Google Earth (free version)

Bob Lowell will be leading discussion of fluids in Mid-Ocean Ridges on 8/31/05
    Bob Lowell will discuss some of his work on modeling seafloor hydrothermal systems. For the new students, a copy of the paper Lowell and Germanovich, Hydrothermal Processes at Mid-Ocean Ridges be put in your mail box. If anyone else needs a copy please let Professor Lowell know.

Aseismic Slip
    Reading Material for Class on 9/7/05 Please look up and read the following papers in preparation for discussion on 9/7 (a quick test of your library skills after your orientation). The general topic will be aseismic slip on faults. The first paper is mainly on afterslip of the 1966 Parkfield earthquake, while the following two are on eposidic slip along the Cascadia subduction zone. You will note some interesting differences in these two areas.

  • Scholz, C., M. Wyss, and S. Smith, Seismic and Asesmic Slip on the San Andreas Fault, Journ. Geophys. Res., V 74, No 8., 2049-69, 1969. (pay more attention to the phenomenon rather than his theory for why).
  • Miller, M., T. Melbourne, D. Johnson, and W. Sumner, Periodic Slow Earthquakes from the Cascadia Subduction Zone, Science,V 295, No. 29, 2423, 2002.
  • Rogers, G. and H. Dragert, Episodic Tremor and Slip on the Cascadia Subduction Zone, Science, V 300, No. 5627, 1942-1943, 2003.

Sumatran Earthquake, Revisited
    Reading Material for Class on 9/14/05
    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.

  • Lay et al., "The Great Sumatra-Andaman Earthquake of 26 December 2004", Science, V 308, 20 May 2005.(Download Here)
  • Supplemental Online, Informaiton.(Download Here)
Graduate Student Research Presentation
    Tatiana Toteva
    "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)

Introduction to GMT scripting (9/28/05)

Informal Discussion of the October 8, 2005 Pakistani Earthquake (10/12/05)
    GMT figure of convergence rate (relative to stable Eurasian plate

    GMT script that created ps version

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.

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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