Superconducting Gravimetry

Neumeyer, J.

doi:10.1007/978-3-642-11741-1_10

Cited by 26 publications

(34 citation statements)

References 93 publications

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“…Harmonic analysis methods are the most common approach used to model the tidal signal. Thus, a multiple regression model in the time domain is derived from a multiple-input-single-output system, through [Neumeyer, 2010;Wenzel, 1997] …”

Section: 1002/2013jb010795mentioning

confidence: 99%

Volcanic signatures in time gravity variations during the volcanic unrest on El Hierro (Canary Islands)

et al. 2014

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Gravity changes occurring during the initial stage of the 2011-2012 El Hierro submarine eruption are interpreted in terms of the preeruptive signatures during the episode of unrest. Continuous gravity measurements were made at two sites on the island using the relative spring gravimeter LaCoste and Romberg gPhone-054. On 15 September 2011, an observed gravity decrease of 45 μGal, associated with the southward migration of seismic epicenters, is consistent with a lateral magma migration that occurred beneath the volcanic edifice, an apparently clear precursor of the eruption that took place 25 days later on 10 October 2011. High-frequency gravity signals also appeared on 6-11 October 2011, pointing to an occurring interaction between a magmatic intrusion and the ocean floor. These important gravity changes, with amplitudes varying from 10 to À90 μGal, during the first 3 days following the onset of the eruption are consistent with the northward migration of the eruptive focus along an active eruptive fissure. An apparent correlation of gravity variations with body tide vertical strain was also noted, which could indicate that concurrent tidal triggering occurred during the initial stage of the eruption.

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Section: 1002/2013jb010795mentioning

confidence: 99%

Volcanic signatures in time gravity variations during the volcanic unrest on El Hierro (Canary Islands)

et al. 2014

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“…Models of seismic NN have been gradually refined over the past decades [6,[8][9][10]. Atmospheric NN was identified as a limiting noise source in superconducting gravimeters at mHz frequencies, and noise cancellation successfully im- plemented using pressure sensors [11]. However, it is to be expected that atmospheric NN cancellation in future large-scale GW detectors will be significantly more complicated due to a greater variety of atmospheric phenomena that can cause NN [12].…”

Section: Introductionmentioning

confidence: 99%

Towards a first design of a Newtonian-noise cancellation system for Advanced LIGO

Coughlin

Mukund

Harms

et al. 2016

Class. Quantum Grav.

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Newtonian gravitational noise from seismic fields is predicted to be a limiting noise source at low frequency for second generation gravitational-wave detectors. Mitigation of this noise will be achieved by Wiener filtering using arrays of seismometers deployed in the vicinity of all test masses. In this work, we present optimized configurations of seismometer arrays using a variety of simplified models of the seismic field based on seismic observations at LIGO Hanford. The model that best fits the seismic measurements leads to noise reduction limited predominantly by seismometer selfnoise. A first simplified design of seismic arrays for Newtonian-noise cancellation at the LIGO sites is presented, which suggests that it will be sufficient to monitor surface displacement inside the buildings.PACS numbers: 95.75.-z,04.30.-w

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“…6c) is much more complicated and the possible sources will be discussed in a future study. The time series showing only a single frequency band are likely due to the anti-aliasing filter in the instrument system (Hinderer et al 2007;Neumeyer 2010).…”

Section: Resultsmentioning

confidence: 99%

“…SGs were developed more than 50 years ago and have become the most sensitive and stable instrument for gravity measurement with 1 nanoGal (1 × 10 -11 ms -2 ) capability in the frequency domain (an accuracy of 0.1 μgal in time domain) with a low drift rate of a few microgal per year. Thanks to the high precision SGs have been used to monitor geophysical phenomena for different periods and amplitudes, such as solid earth tide, atmospheric effects, ocean and polar motion, precipitation, groundwater changes and earthquakes (Hinderer et al 2007;Neumeyer 2010).…”

Section: Introductionmentioning

confidence: 99%

Superconducting Gravimeters Detect Gravity Fluctuations Induced by Mw 5.7 Earthquake Along South Pacific Rise Few Hours Before the 2011 Mw 9.0 Tohoku-Oki Earthquake

Zhang¹,

Ma²

2014

Terr. Atmos. Ocean. Sci.

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Gravity changes sometimes appear before a big earthquake. To determine the possible sources is important for recognizing the mechanism and further geodynamic studies. During the first two hours on March 11 before the M w 9.0 Tohoku-Oki earthquake, the non-tidal gravity time series of superconducting gravimeters worldwide showed low-frequency (< 0.10 Hz) fluctuations with amplitude of ~1 to 4 × 10 -8 ms -2 lasting ~10 -20 minutes. Through comparing global seismicity with the arrival times of seismic waves, we find that the fluctuations were induced by the M w 5.7 earthquake that occurred at 0:14:54.68 at (53.27°S, 118.18°W) along the eastern South Pacific Rise. Several body waves such as P, S are clearly recorded in the station with ~400 km distance to the hypocenter. The fluctuations are in response to the waves that propagate with a velocity of about 4 km s -1 . Their amplitudes are proportional to the inverse of the epicentral distances even though the fluctuations of European sites were overlapped with waves associated with a smaller, i.e., M w 2.6, event in Europe during this period. That is, the M w 5.7 earthquake induced remarkable gravity fluctuations over long distances at stations all over the world. As such, the foreshocks with larger magnitudes occurred before the M w 9.0 earthquake would have more significant influence on the gravity recordings and the seismic-wave induced component should be removed during the analysis of anomalies prior to a great earthquake in future studies.

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Superconducting Gravimetry

Cited by 26 publications

References 93 publications

Volcanic signatures in time gravity variations during the volcanic unrest on El Hierro (Canary Islands)

Volcanic signatures in time gravity variations during the volcanic unrest on El Hierro (Canary Islands)

Towards a first design of a Newtonian-noise cancellation system for Advanced LIGO

Superconducting Gravimeters Detect Gravity Fluctuations Induced by Mw 5.7 Earthquake Along South Pacific Rise Few Hours Before the 2011 Mw 9.0 Tohoku-Oki Earthquake

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