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1969•Journal of Geophysical Research AtmospheresRequires access

Investigation of long-period noise at the large aperture seismic array

Jack Capon

Open publisher page 49 citations

Abstract

An investigation was made to determine the sources and properties of the seismic noise in the 20− to 40-second period range at the large aperture seismic array (LASA) in Montana. The conventional and high-resolution frequency-wavenumber spectra are presented for the noise, as well as coherence results. These data show that the noise consists of two components. One component propagates across the array as fundamental-mode Rayleigh waves and is believed to be caused by the action of surf on coastlines. The other component is nonpropagating, or incoherent, noise; some of its properties will be discussed.

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What this paper is about

An investigation was made to determine the sources and properties of the seismic noise in the 20− to 40-second period range at the large aperture seismic array (LASA) in Montana. The conventional and high-resolution frequency-wavenumber spectra are presented for the noise, as well as coherence results. These data show that the noise consists of two components. One component propagates across the array as fundamental-mode Rayleigh waves and is believed to be caused by the action of surf on coastlines. The other component is nonpropagating, or incoherent, noise; some of its properties will be discussed.

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Available abstract

An investigation was made to determine the sources and properties of the seismic noise in the 20− to 40-second period range at the large aperture seismic array (LASA) in Montana. The conventional and high-resolution frequency-wavenumber spectra are presented for the noise, as well as coherence results. These data show that the noise consists of two components. One component propagates across the array as fundamental-mode Rayleigh waves and is believed to be caused by the action of surf on coastlines. The other component is nonpropagating, or incoherent, noise; some of its properties will be discussed.

Key concepts: Seismic array, Seismic noise, Rayleigh wave, Noise (video), Geology, Coherence (philosophical gambling strategy), Wavenumber, Seismology

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