KURILE ISLANDS EXPERIMENT OCEAN-BOTTOM SEISMOGRAPHIC EXPERIMENTS
Abstract
An Ocean-Bottom Seismograph Kurile Islands Experiment, conducted between 21 October 1966 and 16 December 1966 under Contract F 33657-67-C-0105, had as objectives the determining of the operational worthiness of the OBS and the increasing of knowledge of seismic velocities, epicenter determinations, microseisms, and seismicity in the area of interest. All field objectives were accomplished as planned or modified to satisfy field conditions. OBS units are reliable, self-contained, free-fall, remote-recall, deep-ocean instrument packages. Five-ton calibration charges can be packaged at sea and successfully deployed. All 5.2-ton calibration shots were well-recorded throughout the network. The bathymetric data indicate that the shelf margin and slope areas of the Kurile trench are more complex than previously mapped. Most events recorded by the OBS network were local or near-regional. Weather movements correlated with noise-amplitude fluctuations. Noise levels were of the same order of magnitude as found in previous work. Analysis of first-arrival data indicated an average crustal velocity of 5.4 km/sec and a mantle velocity of 8.1 km/sec in the Kurile region. More problems were caused by foul weather than any other factor.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 30, 1967
- Accession Number
- AD0665862
Entities
People
- A. Frank Linville
- Joseph G. Mcdermott
- Terence W. Harley
Organizations
- Texas Instruments