Accession Number:

AD0271184

Title:

INITIAL STUDIES ON UNDERGROUND NUCLEAR DETECTION WITH SEISMIC DATA PREPARED BY A NOVEL DIGITIZATION SYSTEM

Descriptive Note:

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE

Personal Author(s):

Report Date:

1961-06-30

Pagination or Media Count:

1.0

Abstract:

A semi-automatic paper record digitization system, developed by the project was applied to a number of seismic records resulting from the Logan and Blanca nuclear shots. Data for 27 records digitized at 120 sec increments and for 34 earthquake records adapted from digitizations of Bruce Bogert are presented. Rough measures of microseismic noise amplitude show inverse correlation with distance from nearest ocean. Two spectral estimations near the coast show narrow lines at 1, 1.4, and about 2.9 cps in the vertical whereas at a three component inland station the noise was primarily concentrated below 1 cps, with small peaks at higher frequencies appearing on the horizontals only, suggestive of Love waves. A test for the presence of Rayleigh waves on this three component record, narrow band filtered at 14 cps failed to show any, a possible explanation being barometric coupling to he vertical instrument. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE