Three-dimensional velocity model of the Los Angeles region from active source seismic data

Kimberly Ann Schramm, University of Texas at El Paso


In 1994, the United States Geological Survey, together with several academic institutions, conducted an active source seismic survey through the Los Angeles basin, known as the Los Angeles Region Seismic Experiment (LARSE). This study presents the results of a three-dimensional tomographic velocity model produced by inverting LARSE first arrival times using First Arrival Seismic Tomography Code (FAST) (Zelt and Barton, 1998). Three-dimensional inversion was chosen in order to obtain a velocity model for portions of the experiment that had three-dimensional ray coverage. These occur primarily on the western edge of the Los Angeles Basin and the adjacent offshore areas. In general, lack of reversing ray coverage throughout much of the model volume leads to questions about the reliability of the model for geologic interpretation. However, there are a number of places where the correlation with geology is strong. In the region of 3D coverage, the San Pedro Basin and Palos Verdes uplift are imaged. The rest of the model consists of three 2D images of the study area along the source/receiver transects. (Abstract shortened by UMI.) ^

Subject Area

Geophysics|Geological Survey

Recommended Citation

Schramm, Kimberly Ann, "Three-dimensional velocity model of the Los Angeles region from active source seismic data" (2004). ETD Collection for University of Texas, El Paso. AAIEP10604.