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    A detailed noise characterization and sensor evaluation of the north island of new zealand using the PQLX data quality control system

    Access Status
    Fulltext not available
    Authors
    Jafarzadeh Rastin, Sepideh
    Unsworth, C.
    Gledhill, K.
    McNamara, D.
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Jafarzadeh Rastin, S. and Unsworth, C. and Gledhill, K. and McNamara, D. 2012. A detailed noise characterization and sensor evaluation of the north island of new zealand using the PQLX data quality control system. Bulletin of the Seismological Society of America. 102 (1): pp. 98-113.
    Source Title
    Bulletin of the Seismological Society of America
    DOI
    10.1785/0120110064
    ISSN
    0037-1106
    School
    Department of Exploration Geophysics
    URI
    http://hdl.handle.net/20.500.11937/51829
    Collection
    • Curtin Research Publications
    Abstract

    In this paper we analyze five years of recordings (2005-2009) from the National Seismograph Network in the North Island of New Zealand using the power spectral density probability density function (PDF) method of McNamara and Buland (2004). At each station the ambient noise is characterized and the stable noise model is then represented with the modes of the corresponding PDFs over all periods. Obtaining such an accurate long-term noise baseline for each station provides a reference model that should serve to prioritize maintenance issues for the network operators. The PDF mode low-noise model (MLNM) for the North Island is then obtained from the minimum of all the noise modes at each period. The maximum and minimum differences between the North Island MLNM and the noise mode model periods are then calculated at each station as a quick assessment tool. The daily and seasonal variations of the noise mode model are then characterized, and the horizontal and vertical mode noise models are then compared at each station. The applied technique is practical for evaluating the cultural noise condition and the earthquake detection capability, as well as the installation design against unwanted tilt and temperature variation.

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