The  effects of the atmospheric pressure changes on seismic signals or how to improve the quality of a station

Beauduin, R.; Lognonné, Philippe; Montagner, Jean‐Paul; Cacho, S.; Karczewski, J. F.; Morand, M.

doi:10.1785/bssa0860061760

Cited by 122 publications

(29 citation statements)

References 10 publications

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“…A second set of papers refers to Sorrells's [3] prediction of the exponential attenuation of the vertical and tilt contributions as a means of reducing noise on geophones, but do not perform any calculations with the equations [13,18,21,25,33,38,[50][51][52][53][54][55][56][57][58][59][60][61][62]. Again, the details of the tilt decay with depth are inconsequential to the validity of these papers.…”

Section: Discussionmentioning

confidence: 99%

Corrected Tilt Calculation for Atmospheric Pressure-Induced Seismic Noise

2022

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In a literature search on the coupling of wind-generated pressure fluctuations into seismic noise, it was noticed that the expression for the angular tilt induced by pressure fluctuations in the seminal paper “A preliminary investigation into the relationship between long-period seismic noise and local fluctuations in the atmospheric pressure” by G. G. Sorrells was only valid at the surface. A search of the literature which cites the Sorrells paper was performed to see if any subsequent research corrected this error, and what effect the error might have on the research. A recent paper by Tanimoto and Wang notes the correct expression for the tilt, but employs the simpler erroneous expression in the research. In this paper, we develop the correct expression for effective measured displacements and approximate expressions analogous to those of Sorrells. The resulting magnitudes and decay with depth are then displayed and compared to Sorrells. Next, the results of the literature search are discussed. The results of three papers are identified as potentially modified by the correction of the tilt calculation. Finally, it is noted that the majority of the papers referenced are not affected by the correction, since many of the papers are for near-surface displacements of very low frequencies.

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Section: Discussionmentioning

confidence: 99%

Corrected Tilt Calculation for Atmospheric Pressure-Induced Seismic Noise

2022

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“…The approach described here considers dust devils as discrete entities (certainly the impression one gets visually in the field) but in fact they are merely the most intense of a whole spectrum of turbulent pressure loads associated with the convecting boundary layer : upwelling sheets of air will apply pseudo-line loads which while having smaller local pressure drops than dust devil vortices, may have much larger areas : modeling of boundary layer convection on Mars is therefore of interest to estimate the background noise. As noted by Sorrels et al (1971) and Douze and Sorrells (1975), much of the seismic noise at a station is correlated with the pressure history, which can be used to estimate and therefore remove that noise (Beauduin et al, 1996;Lognonne and Mosser, 1993). The strong pressure gradients in dust devils make it likely that noise in close encounters cannot be completely decorrelated in this way, however, but dust devils themselves are interesting objects of study, and may act (at least in aggregate) as a set of calibration loads with which to infer the elastic properties of the regolith at the InSight landing site.…”

Section: Discussionmentioning

confidence: 99%

“…While the InSight lander is equipped with a capable meteorology suite which will record pressure, wind, air and ground temperatures in order to decorrelate meteorological contributions from the seismic signal (e.g. Beauduin et al, 1996 ), it may be that seismic instrumentation itself offers a new window on dust devils, and boundary layer convection more generally. Indeed, seismic instrumentation is now being recognized (Pryor et al, 2014) as a useful tool to detect extreme but localized wind gusts on Earth.…”

Section: Introductionmentioning

confidence: 99%

Seismometer Detection of Dust Devil Vortices by Ground Tilt

Lorenz

Kedar

Murdoch

et al. 2015

Bulletin of the Seismological Society of America

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We report seismic signals on a desert playa caused by convective vortices and dust devils. The long-period (10-100s) signatures, with tilts of ~10$^{-7}$ radians, are correlated with the presence of vortices, detected with nearby sensors as sharp temporary pressure drops (0.2-1 mbar) and solar obscuration by dust. We show that the shape and amplitude of the signals, manifesting primarily as horizontal accelerations, can be modeled approximately with a simple quasi-static point-load model of the negative pressure field associated with the vortices acting on the ground as an elastic half space. We suggest the load imposed by a dust devil of diameter D and core pressure {\Delta}Po is ~({\pi}/2){\Delta}PoD$^2$, or for a typical terrestrial devil of 5 m diameter and 2 mbar, about the weight of a small car. The tilt depends on the inverse square of distance, and on the elastic properties of the ground, and the large signals we observe are in part due to the relatively soft playa sediment and the shallow installation of the instrument. Ground tilt may be a particularly sensitive means of detecting dust devils. The simple point-load model fails for large dust devils at short ranges, but more elaborate models incorporating the work of Sorrells (1971) may explain some of the more complex features in such cases, taking the vortex winds and ground velocity into account. We discuss some implications for the InSight mission to Mars.Comment: Contributed Article for Bulletin of the Seismological Society of America, Accepted 29th August 201

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“…Nonetheless, in order to observe small amplitude signals at long periods such as tides or free oscillation of the Earth, such atmospheric noise still needs to be properly treated. The pressure noise on Earth has been studied as a noise source at long-periods of 1-10 mHz, which is below the oceanic micro-seismic bands (Zurn and Widmer 1995;Beauduin et al 1996). These studies suggests that the pressure noise detected on the seismometers is ∼ 10 −8 m/s 2 /Hz 0.5 on the horizontal components and that this noise can be decreased by up to a factor of 10 by applying a correction determined from the correlation between the pressure and seismic data.…”

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confidence: 99%

Estimations of the Seismic Pressure Noise on Mars Determined from Large Eddy Simulations and Demonstration of Pressure Decorrelation Techniques for the Insight Mission

et al. 2017

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International audienceThe atmospheric pressure fluctuations on Mars induce an elastic response in the ground that creates a ground tilt, detectable as a seismic signal on the InSight seismometer SEIS. The seismic pressure noise is modeled using Large Eddy Simulations (LES) of the wind and surface pressure at the InSight landing site and a Green’s function ground deformation approach that is subsequently validated via a detailed comparison with two other methods: a spectral approach, and an approach based on Sorrells’ theory (Sorrells,Geophys. J. Int. 26:71–82, 1971; Sorrells et al., Nat. Phys. Sci. 229:14–16, 1971). The horizontal accelerations as a result of the ground tilt due to the LES turbulence-induced pressure fluctuations are found to be typically ∼ 2–40 nm/s2 in amplitude, whereas the direct horizontal acceleration is two orders of magnitude smaller and is thus negligible in comparison. The vertical accelerations are found to be ∼ 0.1–6 nm/s2 in amplitude. These are expected to be worst-case estimates for the seismic noise as we use a half-space approximation; the presence at some (shallow) depth of a harder layer would significantly reduce quasi-static displacement and tilt effects. We show that under calm conditions, a single-pressure measurement is representative of the large-scale pressure field (to a distance of several kilometers), particularly in the prevailing wind direction. However, during windy conditions, small-scale turbulence results in a reduced correlation between the pressure signals, and the single-pressure measurement becomes less representative of the pressure field. The correlation between the seismic signal and the pressure signal is found to be higher for the windiest period because the seismic pressure noise reflects the atmospheric structure close to the seismometer. In the same way that we reduce the atmospheric seismic signal by making use of a pressure sensor that is part of the InSight Auxiliary Payload Sensor Suite, we also the use the synthetic noise data obtained from the LES pressure field to demonstrate a decorrelation strategy. We show that our decorrelation approach is efficient, resulting in a reduction by a factor of ∼ 5 in the observed horizontal tilt noise (in the wind direction) and the vertical noise. This technique can, therefore, be used to remove the pressure signal from the seismic data obtained on Mars during the InSight mission

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The effects of the atmospheric pressure changes on seismic signals or how to improve the quality of a station

Cited by 122 publications

References 10 publications

Corrected Tilt Calculation for Atmospheric Pressure-Induced Seismic Noise

Corrected Tilt Calculation for Atmospheric Pressure-Induced Seismic Noise

Seismometer Detection of Dust Devil Vortices by Ground Tilt

Estimations of the Seismic Pressure Noise on Mars Determined from Large Eddy Simulations and Demonstration of Pressure Decorrelation Techniques for the Insight Mission

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