3D Data Fusion

On Optimization Techniques for the One-Dimensional Seismic Problem

An optimization code is being developed by the Numerical Optimization Group at UTEP that is to be used with the Hole's Algorithm for solving one-dimensional seismic travel time tomography problem. The new code will offer the use of restrictions in material properties and parameters by applying Interior-Point Methodology. The current Hole's algorithm does not incorporate such restrictions explicitly in the formulation of the nonlinear least squares problem. Our goal is to incorporate our optimization algorithms into the Hole's algorithm.

Keyword(s): 
optimization
seismic
Research Effort: 

Hybrid Optimization

We present a hybrid optimization approach for solving global optimization problems, in particular automated parameter estimation models. The hybrid approach is based on the coupling of the Simultaneous Perturbation Stochastic Approximation (SPSA) and a Newton-Krylov Interior-Point method (NKIP) via a surrogate model.

Keyword(s): 
hybrid
optimization
Author(s): 
Research Effort: 

A Fast, Practical Alternative Towards Joint Inversion of Multiple Datasets

There are many sources of data for Earth tomography models. Currently, each of these datasets is processed separately, resulting in several different Earth models that have specific coverage areas, different spatial resolutions and varying degreesof accuracy. These models often provide complimentary geophysical information on earth structure. To combine the information derived from these complementary models requires a joint inversion method. While such methods are being developed, as a first step, we propose a practical solution to fuse the Earth models coming from different datasets.

Keyword(s): 
joint inversion
alternative
Research Effort: 

A Fixed Point Algorithm for l1 large scale underdetermined systems

Current data acquisition methods are often extremely wasteful. Many protocols acquire massive amounts of data which are then (in large part) discarded without much information by a subsequent compression stage (necessary for storage and transmission). It is possible to recover signals from far fewer measurements than was thought necessary! In practice, this means for example that high resolution imaging is possible with fewer sensors.

Keyword(s): 
fixed point algorithm
large scale
underdetermined systems
Research Effort: 

Carlos A. Quintero

Title(s): 
Master Student
Affiliation(s): 
Research Effort: 

A Primer in Seismology

Seismology impacts society through applications including seismic explorations(seismic profiling), earthquake studies, and nuclear arms control. The fundamental data for seismological studies of the earth’s interior are the travel times of seismic waves. They depend on the characteristics of the media through which the seismic waves
propagate.

Keyword(s): 
Primer
Seismology
Research Effort: 

Leticia Velazquez

Title(s): 
Director of the Computational Science Program
Associate Professor with Tenure
Research Effort: 

Dr. Velazquez is the director of the Computational Science Program in the University of Texas at El Paso. Her research fields are: Hybrid Optimization Methods for Large Scale Nonlinear Programs.

Miguel Argaez

Title(s): 
Assistant Professor
Affiliation(s): 
Research Effort: 

Crustal Structure of the Salton Trough: Integration of Receiver Functions, Gravity, and Magnetic Data

We have constructed new crustal scale models of a unique basin, the Salton Trough of southwestern California, which is inferred to be an incipient ocean basin. The Salton Trough is a polyphase basin with significant extension in addition to dextral shear. To further explore the origin and evolution of this basin, we have integrated receiver functions, gravity, and aeromagnetic data to create subsurface crustal scale models. Gravity data analyses show that lower crust is the source of the anomalies in the Salton Trough area.

Keyword(s): 
crustal structure
receiver function
gravity
magnetic
Research Effort: 

Javier Gomez

Title(s): 
Master Student
Research Effort: