HR: 16:00h
AN: H34B-01 INVITED     [Abstracts]
TI: The B4 Project: Scanning the San Andreas and San Jacinto Fault Zones
AU: * Bevis, M
EM: mbevis@osu.edu
AF: Ohio State University, 154 W. 12th Ave., Columbus, OH 43210 United States
AU: Hudnut, K
EM: hudnut@usgs.gov
AF: USGS, 525 S. Wilson Ave., Pasadena, CA 91106 United States
AU: Sanchez, R
H34B-01 AF: USGS, 525 S. Wilson Ave., Pasadena, CA 91106 United States
AU: Toth, C
H34B-01 AF: Ohio State University, 154 W. 12th Ave., Columbus, OH 43210 United States
AU: Grejner-Brzezinska, D
H34B-01 AF: Ohio State University, 154 W. 12th Ave., Columbus, OH 43210 United States
AU: Kendrick, E
H34B-01 AF: Ohio State University, 154 W. 12th Ave., Columbus, OH 43210 United States
AU: Caccamise, D
H34B-01 AF: Ohio State University, 154 W. 12th Ave., Columbus, OH 43210 United States
AU: Raleigh, D
H34B-01 AF: Ohio State University, 154 W. 12th Ave., Columbus, OH 43210 United States
AU: Zhou, H
H34B-01 AF: Ohio State University, 154 W. 12th Ave., Columbus, OH 43210 United States
AU: Shan, S
H34B-01 AF: Ohio State University, 154 W. 12th Ave., Columbus, OH 43210 United States
AU: Shindle, W
H34B-01 AF: USGS, 525 S. Wilson Ave., Pasadena, CA 91106 United States
AU: Yong, A
H34B-01 AF: USGS, 525 S. Wilson Ave., Pasadena, CA 91106 United States
AU: Harvey, J
H34B-01 AF: UCLA, Box 951567, Los Angeles, CA 90095 United States
AU: Borsa, A
H34B-01 AF: UCSD, 9500 Gilman Dr., La Jolla, CA 92093 United States
AU: Ayoub, F
H34B-01 AF: Caltech, 1200 E. Calif. Blvd., Pasadena, CA 91125 United States
AU: Shrestha, R
H34B-01 AF: NCALM, Univ. of Florida Box 116580, Gainesville, FL 32611 United States
AU: Carter, B
H34B-01 AF: NCALM, Univ. of Florida Box 116580, Gainesville, FL 32611 United States
AU: Sartori, M
H34B-01 AF: NCALM, Univ. of Florida Box 116580, Gainesville, FL 32611 United States
AU: Phillips, D
H34B-01 AF: UNAVCO, 6350 Nautilus Dr., Boulder, CO 80301 United States
AU: Coloma, F
H34B-01 AF: UNAVCO, 6350 Nautilus Dr., Boulder, CO 80301 United States
AB: We performed a high-resolution topographic survey of the San Andreas and San Jacinto fault zones in southern California, in order to obtain pre-earthquake imagery necessary to determine near-field ground deformation after a future large event (hence the name B4), and to support tectonic and paleoseismic research. We imaged the faults in unprecedented detail using Airborne Laser Swath Mapping (ALSM) and all-digital navigational photogrammetry. The scientific purpose of such spatially detailed imaging is to establish actual slip and afterslip heterogeneity so as to help resolve classic `great debates' in earthquake source physics. We also expect to be able to characterize near-field deformation associated with the along-strike transition from continuously creeping to fully locked sections of the San Andreas fault with these data. In order to ensure that the data are extraordinarily well georeferenced, an abnormally intensive array of GPS ground control was employed throughout the project. For calibration and validation purposes, numerous areas along the fault zones were blanketed with kinematic GPS profiles. For redundant determination of the airborne platform trajectory, the OSU independent inertial measurement unit and GPS system were included in the flight payload along with the NCALM equipment. Studies using the ground control are being conducted to estimate true accuracy of the airborne data, and the redundant flight trajectory data are being used to study and correct for errors in the airborne data as well. All of this work is directed at overall improvement in airborne imaging capabilities, with the intent of refining procedures that may then be used in the large-scale GeoEarthScope project over the next few years, led by UNAVCO. More generally, we also intend to improve airborne imaging to the point of geodetic quality. The present NSF-funded project, led by Ohio State University and the U. S. Geological Survey, was supported in all aspects of the airborne data acquisition and laser data processing by the National Center for Airborne Laser Mapping (NCALM), in continuous GPS station high-rate acquisition by SCIGN, and in GPS ground control by UNAVCO. A group of volunteers from USGS, UCSD, UCLA, Caltech and private industry, as well as gracious landowners along the fault zones, also made the project possible. Optech contributed use of their latest scanner system, a model 5100, for the laser data acquisition along all of the faults scanned. The data set will be made openly available to all researchers as promptly as possible, but currently OSU and NCALM are still working on the data processing.
DE: 1240 Satellite geodesy: results (6929, 7215, 7230, 7240)
DE: 1294 Instruments and techniques
DE: 1295 Integrations of techniques
DE: 6924 Interferometry (1207, 1209, 1242)
DE: 7221 Paleoseismology (8036)
SC: Hydrology [H]
MN: Fall Meeting 2005