Physics
Scientific paper
Jan 1968
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968pepi....1...97s&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 1, Issue 2, p. 97-102.
Physics
4
Scientific paper
The variations of amplitude/period ratios near the caustic produced by PKP waves through the Earth's outer core are investigated. An epicentral distance range of 133°-153° is covered by using 136 readings of 25 shallow-focus earthquakes as recorded by short-period vertical-component seismographs of the Swedish network. Earthquakes from May to December 1963 in the Kermadec-Tonga Islands region in the SW Pacific Ocean are selected for this study. For this region the maximum separation between Swedish stations (Karlskrona (Ka) and Kiruna (Ki)) is about 12°. The distance variation of the normalized ratios is compared with the theoretical Airy integral curve. The caustic is found to be located at 144.2°, and the maximum of the amplitude/period ratio is at 144.9° for shallow-focus earthquakes. The maximum amplitude/period ratio is about three times as great as at 148° distance, which in turn is three times as great as inside the shadow zone at distances less than 143°. The detection threshold for a short-period seismograph for an event located at 144.9° distance from Kiruna is M = 4.5. On leave from the Geophysical Institute of Tehran University, Tehran, Iran.
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