2017
DOI: 10.1002/2017gl074892
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First Observation of the Earth's Permanent Free Oscillations on Ocean Bottom Seismometers

Abstract: The Earth's hum is the permanent free oscillations of the Earth recorded in the absence of earthquakes, at periods above 30 s. We present the first observations of its fundamental spheroidal eigenmodes on broadband ocean bottom seismometers (OBSs) in the Indian Ocean. At the ocean bottom, the effects of ocean infragravity waves (compliance) and seafloor currents (tilt) overshadow the hum. In our experiment, data are also affected by electronic glitches. We remove these signals from the seismic trace by subtrac… Show more

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Cited by 26 publications
(27 citation statements)
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“…We note that the SIO phase 2 instruments produced data that contained a long‐period transient that occurred approximately every 3,625 s and lasted for about 10 min. While effective techniques have been developed to remove these transients (e.g., Deen et al, ), here we simply examined 30‐min transient‐free windows for these stations, which was sufficient to observe signals with periods <200 s.…”
Section: Datamentioning
confidence: 99%
See 1 more Smart Citation
“…We note that the SIO phase 2 instruments produced data that contained a long‐period transient that occurred approximately every 3,625 s and lasted for about 10 min. While effective techniques have been developed to remove these transients (e.g., Deen et al, ), here we simply examined 30‐min transient‐free windows for these stations, which was sufficient to observe signals with periods <200 s.…”
Section: Datamentioning
confidence: 99%
“…We note that the SIO phase 2 instruments produced data that contained a long-period transient that occurred approximately every 3,625 s and lasted for about 10 min. While effective techniques have been developed to remove these transients (e.g., Deen et al, 2017), here we simply examined 30-min transient-free windows for these stations, which was sufficient to observe signals with periods <200 s. (c) Kernels computed for a typical crust with 1,000 m of fast, volcanic sediments overlying the crust. Notice that the vertical scale only covers 2 km for the two lower sets of kernels.…”
Section: Datamentioning
confidence: 99%
“…In order to enhance the signal to noise ratio, we further select the Rayleigh wave train windows on the stack of auto-correlograms by setting to 0 the rest of the signal as in Deen et al (2017). We keep signal around 0-time lag and around each surface wave train R1 to R3.…”
Section: Normal Modes: Detection and Seismometer Performancementioning
confidence: 99%
“…Unfortunately, most of them are deployed on land and observations are strongly limited by the poor instrumental coverage in ocean basins. Ocean-bottom seismometers (OBSs) have been considerably improved to fill this gap: (i) their autonomy can exceed 1 yr; (ii) the use of threecomponent, broad-band sensors is becoming standard; (iii) they are now easy to deploy and (iv) their performance are catching up with those of terrestrial stations, enabling them to measure faint signals such as Earth's free oscillations (Deen et al 2017). Despite those impressive advances, the way OBSs are deployed has not changed much since their invention.…”
Section: Introductionmentioning
confidence: 99%