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Project Number 68
Date of Summary July 31, 1997
Subject Seafloor Seismic Data Study
Performing Activity Sandia National Laboratories
Principal Investigator Mr. Ron Franco
Contracting Agency Minerals Management Service
Estimated Completion Complete
Description The objective was to analyze seafloor earthquake motion data for seismic active areas of southern California and the Arctic. The program focused on the use of the seafloor Earthquake Measurement System (SEMS) to collect and store seafloor seismic events. Offshore ground motions may differ from onshore motion in several aspects:

(1) Attenuation factors may be different in saturated soft and/or gassy seafloor soils;

(2) wave reflection within the water column may alter site-specific wave column;

(3) the wave reflection pattern may differ due to soil profiles; and

(4) the sediment profile may cause a focusing or defocusing of the seismic waves.

The results of this project will be used to evaluate the earthquake hazards of energy development and to provide data on design parameters.
Progress Complete. The instruments were turned over to the State of California to continue gathering data. This data will be made available to the MMS.
Reports
AA (24 pages) File in Adobe's Portable Document Format (PDF) . Hickerson, J., Seafloor Earthquake Measurement in the Southern Bering Sea and the Aleutian Shelf, Proposal No. 6241126WA, Sandia National Laboratories, Albuquerque, New Mexico, November 26, 1984.
AB (20 pages) File in Adobe's Portable Document Format (PDF) . Dodd, H. M., Hickerson, J., Lopez A., Shell SEMS Project, Quarterly Report No. 1, Sandia National Laboratories, Albuquerque, New Mexico, October-November 1984.
AC (20 pages) File in Adobe's Portable Document Format (PDF) . Engi, D., Hickerson, J., Lopez, A., Shell SEMS Project, Quarterly Report No. 2, Sandia National Laboratories, Albuquerque, New Mexico, January-March 1985.
AD (8 pages) File in Adobe's Portable Document Format (PDF) . Hickerson, J. P., Seafloor Seismic Measurement in the Southern Bering, Proceedings of the Arctic Energy Technologies Workshop, U.S. Department of Energy, Morgantown, West Virginia, April 1985, pp 173-180.
AE (14 pages) File in Adobe's Portable Document Format (PDF) . Engi, D., Hickerson, J., Lopez, A., Shell SEMS Project, Quarterly Report No. 3, Sandia National Laboratories, Albuquerque, New Mexico, April-June 1985.
AF (4 pages) File in Adobe's Portable Document Format (PDF) . Engi, D., Seafloor Earthquake Measurement System Quarterly Report, Sandia National Laboratories, Albuquerque, New Mexico, October- December 1985.
AG (8 pages) File in Adobe's Portable Document Format (PDF) . Engi, D., Seafloor Earthquake Measurement System, Quarterly Report, Sandia National Laboratories, Albuquerque, New Mexico, December 1986.
AH (116 pages) File in Adobe's Portable Document Format (PDF) . Lopez, A. A., Hickerson, J. P., Design of the Shell Project Seafloor Earthquake Measurement System (SEMS), Sandia Report SAND 85-2604, Sandia National Laboratories, Albuquerque, New Mexico, March 1987.
AI (7 pages) File in Adobe's Portable Document Format (PDF) . Hommert, P. J., Seafloor Earthquake Measurement System, Quarterly Report, Sandia National Laboratories, Albuquerque, New Mexico, October 11, 1987-December 31, 1987.
AJ (7 pages) File in Adobe's Portable Document Format (PDF) . Hommert, P. J., Seafloor Earthquake Measurement System, Quarterly Report, Sandia National Laboratories, Albuquerque, New Mexico, January 1, 1988-March 31, 1988.
AK (11 pages) File in Adobe's Portable Document Format (PDF) . Thorne, B. J., Location of Point Pedernales SEMS Unit, Memorandum Report, Sandia National Laboratories, Albuquerque, New Mexico, January 17, 1990.
AL (8 pages) File in Adobe's Portable Document Format (PDF) . Sleefe, G. E., The Long-Term Measurement of Strong-Motion Earthquakes Offshore Southern California, Proceedings of the 22nd Annual Offshore Technology Conference, pp. 561-568, Houston, Texas, May 1990.
AM (68 pages) File in Adobe's Portable Document Format (PDF) . Platzbecker, Mark R., Joseph P. Ehasz, Ronald J. Franco, Seafloor Earthquake Measurement System, SEMS IV, SAND97-1630, Sandia National Laboratories, Albuquerque, New Mexico, July 1997.
 

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