ESTIMATION OF THE DEPTH OF FOCUS OF THE MAY 10, 1963 ECUADOR EARTHQUAKE.
Special technical rept.,
PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF GEOLOGY AND GEOPHYSICS
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The validity of a modified version of Merdlers 1964 depth-estimation procedure is tested. Criteria are developed to screen test significant answers. The criteria did not reject the correct solutions when applied to synthetic data. In testing earthquake data, 237 out of 312 significant answers were rejected by the criteria. The final output seismograms chosen for each station after visual examination were reasonably simplified for records which have a large initial amplitude, while those records beginning with a small amplitude were not reasonably simplified, in general. The average depth estimated is 13.1 km excluding the 3 extreme solutions. The depths are quite similar plus or minus 3 km. The time difference of sP-P, PcP-P and sPcP-P may explain most of the larger estimated Ts. From the consistency of the results, it appears that identification of pulses other than pP are likely. The modified procedure appears to provide a reasonable measure of the focal depth of a crustal earthquake. Author