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Dominant seismic noise sources in the Southern Ocean and West Pacific, 2000–2012, recorded at the Warramunga Seismic Array, Australia
Author(s) -
Reading Anya M.,
Koper Keith D.,
Gal Martin,
Graham Leon S.,
Tkalčić Hrvoje,
Hemer Mark A.
Publication year - 2014
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2014gl060073
Subject(s) - microseism , geology , seismology , seismic noise , noise (video) , storm , ambient noise level , slowness , oceanography , climatology , sound (geography) , artificial intelligence , computer science , image (mathematics)
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 (2000–2012). 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.