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Empirical Constraints on Broadband Array Designs

Empirical Constraints on Broadband Array Designs. Charles A. Langston Center for Earthquake Research and Information University of Memphis. Outline. Broadband array designs – IRIS 2012 meeting Using TA to answer: How coherent are teleseismic body waves?. Array Design Criteria.

june
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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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