SHALLOW COMPOSITION AND STRUCTURE OF THE UPPER PART OF THE EXHUMED SAN GABRIEL FAULT, CALIFORNIA: IMPLICATIONS FOR FAULT PROCESSES AND SEISMIC PROPERTIES Kaitlyn Crouch 1,2 James P. Evans 1. Susanne U. Jänecke 1 1 Department of Geosciences, 4505 Old Main Hill, Utah State University, Logan, UT. 84322-4505 2 Now at: Department of Geosciences, Lewis G. Weeks Hall, 1215 West Dayton Street, University of Wisconsin, Madison, WI 53706-1692 This is a pre-submitted preprint of a paper that we intend to submit to Tektonika by November 1, 2022. Comments and suggestions are welcome.