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Dominant seismic noise sources in the Southern Ocean and West Pacific, 20002012, recorded at the Warramunga Seismic Array, Australia


Reading, AM and Koper, KD and Gal, M and Graham, LS and Tkalcic, H and Hemer, MA, Dominant seismic noise sources in the Southern Ocean and West Pacific, 2000-2012, recorded at the Warramunga Seismic Array, Australia, Geophysical Research Letters, 41, (10) pp. 3455-3463. ISSN 0094-8276 (2014) [Refereed Article]

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Copyright Statement

Copyright 2014 American Geophysical Union

DOI: doi:10.1002/2014GL060073


Seismic noise is important in determining Earth structure and also provides an insight into ocean wave patterns and long-term trends in storm activity and global climate. We present a long-duration study of seismic noise focused on the Southern Ocean using recordings from the Warramunga Seismic Array, Northern Territory, Australia. Using high-resolution analysis, we determine the seismic slowness and back azimuth of observed seismic noise, microseisms, at hourly intervals through over a decade (20002012). We identify three dominant sources of body wave (P) noise in the Southern Ocean which we interpret to originate from a South Atlantic source propagating as PP waves, and Kerguelen Island and Philippine Sea sources propagating as P waves. We also identify surface waves from around the Australian coast. All sources show distinct seasonality and a low, but discernable, interannual variability.

Item Details

Item Type:Refereed Article
Keywords:ambient seismic, seismic noise, ocean storm, seismic array, southern ocean
Research Division:Earth Sciences
Research Group:Geophysics
Research Field:Seismology and seismic exploration
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Reading, AM (Professor Anya Reading)
UTAS Author:Gal, M (Mr Martin Gal)
UTAS Author:Graham, LS (Dr Leon Graham)
ID Code:92290
Year Published:2014
Web of Science® Times Cited:33
Deposited By:Earth Sciences
Deposited On:2014-06-12
Last Modified:2017-10-25

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