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Spectral Analyses of High-Frequency Pn, Sn Phases from very Shallow Focus Earthquakes.
Authors: Daniel A. Walker; George H. Sutton; C. S. McCreery; HAWAII INST OF GEOPHYSICS HONOLULU |
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Abstract:
Hydrophone recordings from July 1979 through November 1980 have been examined for mantle-refracted P phases from underground nuclear explosions and from earthquakes at comparable distances. Explosion generated P phases are found to have a lack of energy relative to earthquake generated P phases for frequencies below about 1.3 Hz. Corner frequencies for explosion P's appear to be around 2 Hz while for earthquake P's these frequencies are lower than 1 Hz. Average amplitudes for explosion P's are higher than for earthquake P's for all recorded frequencies above 2 Hz, in spite of the fact that the average explosion magnitude is less than average earthquake magnitude. In the 2.5 to 2.9 Hz range explosion P's are at least 6 db higher than earthquake P's. (Author)
| Description: |
Final rept. 1 Dec 78-30 Nov 80 |
| Pages: |
26 |
| Report Date: |
NOV 1980 |
| Contract Number: |
F4962079C0007, ARPAOrder3291 |
| Report Number: |
A479690 |
Report Unavailable |
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