منابع مشابه
Strong directivity of ocean-generated seismic noise
[1] We measure direction and amplitude of ocean-generated continuous seismic noise in the western United States. Slowness direction of the noise is determined using array beamforming, and particle motion direction from individual three-component stations. We find two surprising results. First, the noise is highly monodirectional at all sites, regardless of coastal distance. A single narrow gene...
متن کاملOn the Composition of Earth’s Short-Period Seismic Noise Field
In the classic microseismic band of 5-20 s seismic noise consists mainly of fundamental mode Rayleigh and Love waves; however, at shorter periods seismic noise also contains a significant amount of body wave energy and higher-mode surface waves. In this study we perform a global survey of Earth’s short period seismic noise field with the goal of quantifying the relative contributions of these p...
متن کاملAttenuation of short-period seismic waves atMt Vesuvius, Italy
We analysed short-period seismograms from about 250 very local events recorded by a network of high dynamic range short-period seismic stations deployed on Mt Vesuvius to estimate the site-corrected short-period seismic attenuation. We calculated Q{1 C , the inverse of the quality factor for coda waves, for short lapse times (12 s), and Q{1 P and Q{1 S , the inverse of the direct body wave qual...
متن کاملEffect of directivity on estimates of radiated seismic energy
[1] To accurately estimate the seismic energy radiated in an earthquake, it is important to use appropriate corrections for path and source effects. Using slip models obtained by inversion of seismic data, we examine the effect of directivity on estimates of radiated energy and develop a method to correct for this source effect. From our calculations we suggest that the directivity correction f...
متن کاملShort Note Seasonal Anisotropy in Short-Period Seismic Noise Recorded in South Asia
We present an analysis of seismic noise recorded during 1995–2004 by a medium-aperture, short-period seismic array located in Chiang Mai, Thailand (CMAR). We calculated frequency-wavenumber spectra for nearly 1000 randomly selected time windows, each with a length of 160 sec. At frequencies above about 1.4 Hz the noise is unorganized and the wavenumber spectra are isotropic and diffuse; however...
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ژورنال
عنوان ژورنال: Zisin (Journal of the Seismological Society of Japan. 2nd ser.)
سال: 1987
ISSN: 0037-1114,1883-9029,2186-599X
DOI: 10.4294/zisin1948.40.3_397