Augmentation of IMS Infrasound Arrays for Near-field Clutter Reduction Curt A. L. Szuberla, John V. Olson and Kenneth M. Arnoult, Jr. Wilson Infrasound Observatories Geophysical Institute, University of Alaska Fairbanks Presented at the Infrasound Technology Workshop Hamilton Parish, Bermuda 5 November 2008 This presentation does not necessarily reflect the policies or views of the United States Government.
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Augmentation of IMS Infrasound Arrays for Near- field Clutter Reduction Curt A. L. Szuberla, John V. Olson and Kenneth M. Arnoult, Jr. Wilson Infrasound.
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Augmentation of IMS Infrasound Arrays for Near-field
Clutter Reduction
Curt A. L. Szuberla, John V. Olson and Kenneth M. Arnoult, Jr.
Wilson Infrasound ObservatoriesGeophysical Institute, University of Alaska Fairbanks
Presented at the Infrasound Technology WorkshopHamilton Parish, Bermuda 5 November 2008
This presentation does not necessarily reflect the policies or views of the United States Government.
Array Augmentation • ITW 2008 2
AbstractThe analysis of data recorded at IMS infrasound arrays is
complicated by the presence of near-field clutter, both from anthropogenic and geophysical sources. Ideally, the IDC would like to exclude events that arise from within ~100 km of an array from its analysis pipelines. Previous work by our group made use of a signal processing technique to identify signal sources arising from within about ~20 km of a single IMS array, using only that array for the identification. Subsequently, we have explored the use of several, small arrays for precise localization of infrasound sources. This work has begun to be extended to the augmentation of an existing IMS array in an effort to push that near-field identification zone farther out. We present an introduction to this work and preliminary results of numerical simulations.
Array Augmentation • ITW 2008 3
The IMS Infrasound Problem
▫ Principal IMS task: record far-field events ≥ 1kT
▫ Infrasound stations operate in noise:natural & manmade