OCEAN-BOTTOM SEISMOMETER DATA COLLECTION AND ANALYSIS
Abstract
A total of 300 hours of ocean-bottom seismic data have been collected in areas off the Cali fornia Coast and north and south of the Aleutian Chain in varying water depths to 20,000 ft. Re fraction data of Pn arrivals recorded at Adak and on the ocean bottom (from 1000-lb explosive sources in water) yield an average 8.5 Km/second velocity which may be attributed to crustal thickening in the vicinity of the Aleutian Chain. Detailed analyses of a near-regional event re corded simultaneously on land and on the ocean bottom in the vicinity of Cape Mendocino, Cali fornia, show signal-to-noise ratios on land and ocean bottom are comparable with enrichment of the high frequencies on the ocean bottom. The phases are better defined and developed on the ocean bottom than on land. Analyses of land and ocean-bottom noise samples in the California area indicate that at the microseismic peak the ocean-bottom average noise power levels are 20 db greater than at a nearby land station. Both the land and ocean-bottom noise spectra show little variation with time for the samples investigated, and their sources appear to be distributed in azimuth.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 14, 1963
- Accession Number
- AD0426529
Entities
People
- P. J. Farrell
Organizations
- Texas Instruments