The character of the primary seismic wave in the
range of distances between 100 and 600 km is affected by
such factors as the nature of the source, exponential
attenuation, crustal structure, type of wave propagation,
recording site geology and instrument response. The
first arrivals from the GNOME and SHOAL nuclear explosions
were analyzed to show the important effects of the
above factors. Crusta1 structures were developed to examine
the type of wave propagation, geometrical attenuation,
and Q versus depth structure. Within the frequency
bands delineated by the instrument response, above 2 cps,
and the reliable source energies, exponential attenuation
and surface geology explained the major spectral variations
in the first arrivals. Amplitude variations were
explained almost entirely by geometrical and exponential
attenuation. Techniques for measuring exponential attenuation
were developed and applied. The Q values obtained
were primarily between 100 and 200. / Graduation date: 1968
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/28260 |
| Date | 08 November 1967 |
| Creators | Long, L. T. (Leland Timothy) |
| Contributors | Berg, Joseph W. Jr |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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