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Empirical Constraints on Broadband Array Designs

This document outlines empirical constraints and design criteria for broadband seismic arrays, as discussed at the IRIS 2012 meeting. It explores the coherence of teleseismic body waves using transfer function analysis and provides insights on optimal station spacing, array diameter, and wave correlation distances. The study emphasizes the significance of high coherence in vertical P-waveforms at large interstation distances, supporting effective broadband array experiments and strategies for receiver function stacking. Additionally, it assesses the coherence of S-waves and the impacts of upper mantle propagation.

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Empirical Constraints on Broadband Array Designs

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  1. Empirical Constraints on Broadband Array Designs Charles A. Langston Center for Earthquake Research and Information University of Memphis

  2. Outline • Broadband array designs – IRIS 2012 meeting • Using TA to answer: How coherent are teleseismic body waves?

  3. Array Design Criteria Station spacing Array Diameter Wave Correlation Distance (as determined from regional arrays)

  4. Sierpinski Gasket Fractal D=1.58

  5. Is For teleseismic body waves? • Important for: • Array Design • Transfer function analysis

  6. Use TA to get basic data on wave coherency

  7. 449 Vertical P Waves

  8. Procedure Correct for instrument response

  9. Two Analyses • Fixed time windows • -30s to +90s after IASPEI91 P wave arrival time • -60s to +120s after IASPEI91 S wave arrival time • Time window inversely proportional to band pass center frequency

  10. Conclusions • Teleseismic vertical P waveforms show the highest coherence with interstation distance supporting both large aperture, broadband teleseismic array experiments and stacking strategies for receiver functions. • S waves also show reasonable coherence supporting construction of useful large arrays. • Coherence is somewhat degraded for propagation through the upper mantle.

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