HR: 1330h
AN: NS23B-02    [Abstracts]
TI: AVO Analysis of GPR Data over Thinly Laminated Strata
AU: * Guha, S
EM: sguha@mail.usf.edu
AF: University of South Florida, Department of Geology 4202 E Fowler Avenue SCA 522, Tampa, Fl 33620
AU: Kruse, S
EM: skruse@chuma1.cas.usf.edu
AF: University of South Florida, Department of Geology 4202 E Fowler Avenue SCA 522, Tampa, Fl 33620
AU: Wright, E
EM: ewright@coastal.edu
AF: Coastal Carolina University, Department of Marine Science PO BOX 261954, Conway, SC 29528
AB: Identification of multiple closely spaced thin layers (< 1/8 of GPR wavelength) in GPR records can be difficult as these sequences generate interference patterns. No distinct correspondence between the reflection events and the reflecting horizons can be made in such cases. As thin layers are common features in most sedimentary environments, any information related to their presence made available from GPR data would be valuable for stratigraphic purposes. FDTD (finite-difference-time-domain) models for different thin layer patterns show that detectable GPR responses can be produced at frequencies of 100MHz, 200 MHz and 500 MHz. In general GPR response from laminated zones shows a spectral shift toward higher frequencies. Here we examine the effects of thinly laminated zones on GPR trace amplitudes and frequencies as a function of antenna offset (AVO) with 2D FDTD models. Model results are compared against GPR common-midpoint gathers over magnetite-rich beach laminations on Waites Island, South Carolina.
DE: 0600 ELECTROMAGNETICS
DE: 0644 Numerical methods
DE: 0689 Wave propagation (4275)
DE: 0694 Instrumentation and techniques
DE: 0699 General or miscellaneous
SC: Near-Surface Geophysics [NS]
MN: 2005 Joint Assembly