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Source directionality of ambient seismic noise inferred from three‐component beamforming
Author(s) -
Behr Y.,
Townend J.,
Bowen M.,
Carter L.,
Gorman R.,
Brooks L.,
Bannister S.
Publication year - 2013
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.983
H-Index - 232
eISSN - 2169-9356
pISSN - 2169-9313
DOI - 10.1029/2012jb009382
Subject(s) - microseism , seismic noise , seismometer , seismology , rayleigh wave , ambient noise level , geology , noise (video) , acoustics , surface wave , broadband , telecommunications , physics , oceanography , computer science , sound (geography) , artificial intelligence , image (mathematics)
Abstract The increased use of ambient seismic noise for seismic imaging requires better understanding of the ambient seismic noise wavefield and its source locations and mechanisms. Although the source regions and mechanisms of Rayleigh waves have been studied extensively, characterization of Love wave source processes are sparse or absent. We present here the first systematic comparison of ambient seismic noise source directions within the primary (~10–20 s period) and secondary (~5–10 s period) microseism bands for both Rayleigh and Love waves in the Southern Hemisphere using vertical‐ and horizontal‐component ambient seismic noise recordings from a dense temporary network of 68 broadband seismometers in New Zealand. Our analysis indicates that Rayleigh and Love waves within the primary microseism band appear to be mostly generated in different areas, whereas in the secondary microseism band they arrive from similar backazimuths. Furthermore, the source areas of surface waves within the secondary microseism band correlate well with modeled deep‐water and near‐coastal source regions.