Improved Procedures for Determining Seismic Source Depths from Depth Phase Information
ENSCO INC SPRINGFIELD VA INFORMATION AND SYSTEM SCIENCES DIV
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The objective of this research is to develop an improved analysis procedure to determine teleseismic source depths from seismogram recordings. The purpose of this research is to substantially increase the percentage of events for which accurate source depths can be obtained, and to facilitate the analysis. The results of this research demonstrated that the automated source depth determination procedure constructively utilizes source depth information contained throughout the seismograms, and thereby significantly enhances source depth determinations. This was shown by obtaining the correct depth for an event through the separate analysis of the first and second minute of data, verifying the usefulness of source depth information contained in the later seismic phases. A further verification of the effectiveness of this procedure was achieved by obtaining correct depth estimates from data arriving through individual seismic phases, and from data recorded at individual stations.