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Thursday, March 6 • 4:30pm - 6:30pm
Poster: Waveform inversion with source coordinate model extension, Yin Huang, Rice University

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Extended full waveform inversion combines ideas of seismic inversion and migration velocity analysis using extended model concept. For the linearized extended full waveform inversion (LEFWI), the model (extended) is separated into smooth background velocity (physical) and short scale reflectivity (extended). Minimization over the reflectivity gives a reduced objective function over the background velocity, which then can be minimized over velocity. We will review this method and then show some numerical results of source coordinate model extension. Adjoint state method is used to get derivatives of this method. Without the satisfaction of the adjoint relation, the optimization may have slow convergence rate or even do not converge at all. Thus, testing of the adjoint relation is crucial to a successful implementation. I will present a method to compute a derivative and its adjoint of a generalized time step function, with an automatic differentiation tool: TAPENADE, and then show testing results of the acoustic constant density wave equation.

Speakers
YH

Yin Huang

6100 Main St, MS-134, Houston, TX, CAAM-Rice University
I am a forth year as a PhD student at the Computational and Applied Mathematics Department at Rice University, and am now doing research on Extended Waveform Inversion, Imaging and High Performance Computing under the supervision of Dr. William Symes. | | Relevant courses work includes Numerical Analysis, Numerical Differential Equations, Optimization, High Performance Computing, Geophysical Data Analysis and Exploration Geophysics.


Thursday March 6, 2014 4:30pm - 6:30pm
BRC Exhibit Hall Rice University 6500 Main Street at University, Houston, TX 77030

Attendees (1)