P-WAVE SIGNAL EXTRACTION USING 3-COMPONENT SUBSYSTEM AT TFO
Array research special rept.
TEXAS INSTRUMENTS INC DALLAS SCIENCE SERVICE DIV
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Results of an initial analysis of long-period and short-period data collected at the Tonto Forest Seismological Observatory TFO are presented in this report. The objective of this work is experimental evaluation of the 3- component systems capability to reject noise by exploiting the relationship between horizontal and vertical components of the seismic noise field. Short- period data analyzed included three 8-min recordings consisting of two teleseismic signals and one noise sample, while long-period data included one 40-min teleseismic signal encompassing the P through L interval and one 40-min noise sample. The long-period data was taken from the 200-km dia extended array with 50-km minimum element spacing, while the short-period data was taken from the 10-km TFO cross-array. Long-period P- and S-waves appeared extremely reproducible across the array, indicating minimal vertical crustal filtering variations.