Continuation of the Iranian Long-Period Array Evaluation
TEXAS INSTRUMENTS INC DALLAS EQUIPMENTGROUP
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This report presents a continuation of the evaluation of long-period data recorded at the Iranian Long Period Array ILPA. This evaluation was performed by Texas Instruments Inc., at the Seismic Data Analysis Center in Alexandria, Va. In the area of long-period noise analysis, this report discusses RMS noise levels and trends and average noise RMS amplitude spectra for both the individual sites and the beamformed data. The array noise data is also used to investigate the questions of noise coherence and propagating noise. In the area of signal analysis, signal-to-noise ratio gains due to beamforming and site-to- site signal similarities are investigated. Using a processed data base of 613 events, regionalized detection capability estimates and earthquake-presumed explosion discrimination are presented. Finally, the report briefly presents a comparison of the array and the closest Seismic Research Observatory station.