ANALYSIS OF UNMANNED AERIAL VEHICLE IMAGERY ALONG THE SOUTHERNMOST ELSINORE FAULT ZONE

We collected very high-resolution Unmanned Aerial Vehicle (UAV) imagery along the southernmost Elsinore fault in the Coyote Mountains, Imperial Valley, California, to identify and resolve displacements of offset Holocene alluvial bars and channels. We employed a DJI Phantom 4 Pro at a flight altitude of ~25 m to collect aerial imagery, and processed the images with Agisoft software to produce a point cloud, DEM, slope map and orthomosaic with sub-cm resolution. We identified evidence for three late Holocene surface ruptures in Alverson Canyon, and we compare our results to those interpreted from previously collected aerial photography, total station and tripod-based LiDAR surveys, and field-based tape measure estimates.