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    Statistical analysis of fireballs: Seismic signature survey

    90019.pdf (4.506Mb)
    Access Status
    Open access
    Authors
    Neidhart, Tanja
    Miljkovic, Katarina
    Sansom, Ellie
    Devillepoix, Hadrien
    Kawamura, T.
    Dimech, J.L.
    Wieczorek, M.A.
    Bland, Phil
    Date
    2021
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Neidhart, T. and Miljković, K. and Sansom, E.K. and Devillepoix, H.A.R. and Kawamura, T. and Dimech, J.L. and Wieczorek, M.A. et al. 2021. Statistical analysis of fireballs: Seismic signature survey. Publications of the Astronomical Society of Australia. 38: PII S1323358021000114.
    Source Title
    Publications of the Astronomical Society of Australia
    DOI
    10.1017/pasa.2021.11
    Additional URLs
    http://dx.doi.org/10.1017/pasa.2021.11
    ISSN
    1323-3580
    Faculty
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP180100661
    http://purl.org/au-research/grants/arc/DE180100584
    http://purl.org/au-research/grants/arc/DP170102529
    http://purl.org/au-research/grants/arc/DP200102073
    Remarks

    This article has been accepted for publication and published in a revised form in Publications of the Astronomical Society of Australia http://doi.org/10.1017/pasa.2021.11. This version is free to view and download for private research and study only. Not for re-distribution or re-use. © The Authors 2021

    URI
    http://hdl.handle.net/20.500.11937/90195
    Collection
    • Curtin Research Publications
    Abstract

    Fireballs are infrequently recorded by seismic sensors on the ground. If recorded, they are usually reported as one-off events. This study is the first seismic bulk analysis of the largest single fireball data set, observed by the Desert Fireball Network (DFN) in Australia in the period 2014-2019. The DFN typically observes fireballs from cm-m scale impactors. We identified 25 fireballs in seismic time series data recorded by the Australian National Seismograph Network (ANSN). This corresponds to 1.8% of surveyed fireballs, at the kinetic energy range of 106-1010 J. The peaks observed in the seismic time series data were consistent with calculated arrival times of the direct airwave or ground-coupled Rayleigh wave caused by shock waves by the fireball in the atmosphere (either due to fragmentation or the passage of the Mach cone). Our work suggests that identification of fireball events in the seismic time series data depends on both physical properties of a fireball (such as fireball energy and entry angle in the atmosphere) and the sensitivity of a seismic instrument. This work suggests that fireballs are likely detectable within 200 km direct air distance between a fireball and seismic station, for sensors used in the ANSN. If each DFN observatory had been accompanied by a seismic sensor of similar sensitivity, 50% of surveyed fireballs could have been detected. These statistics justify the future consideration of expanding the DFN camera network into the seismic domain.

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