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Origin of Earth's ground noise from 2 to 20 mHz
Author(s) -
Nishida Kiwamu,
Kobayashi Naoki,
Fukao Yoshio
Publication year - 2002
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 - 10.1029/2001gl013862
Subject(s) - passband , rayleigh wave , seismic noise , earth (classical element) , geology , rayleigh scattering , geophysics , seismology , range (aeronautics) , seismogram , surface wave , transparency (behavior) , physics , optics , computer science , astronomy , band pass filter , materials science , computer security , composite material
Long‐period seismology probes the Earth's interior through the seismic passband in a period range from 50 to 500 s. The limitation of seismic transparency in this band is known but the source of limitation has been a long‐standing puzzle. Here we report evidence that the transparency is limited, over the entire passband, by fundamental Rayleigh waves excited by global and random sources in a thin layer just above the Earth's surface.