Monitoring earthquakes with gravity meters

Niebauer, T. M.; MacQueen, Jeffrey D.; Aliod, D.; Francis, Olivier

doi:10.3724/sp.j.1246.2011.00071.2

Cited by 15 publications

(9 citation statements)

References 2 publications

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“…Earthquakes introduce a whole range of different frequency accelerations (Kulhánek, 1990;Greco et al, 2008;Niebauer et al, 2011;Ghobadi-Far et al, 2019) which can influence both the accuracy of individual readings as well as the repeatability of measurement cycles. The effect of large earthquakes on microgravity measurements is strongly dependent on the magnitude and depth of the earthquake and distance of the recording instrument from the epicentre.…”

Section: Effects Of Earthquakes On Gravity Readingsmentioning

confidence: 99%

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Microgravity surveying before, during and after distant large earthquakes

Boddice

Metje

Tuckwell

2022

Journal of Applied Geophysics

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Section: Effects Of Earthquakes On Gravity Readingsmentioning

confidence: 99%

“…In contrast, gravimeters are usually designed to filter this noise, either through sensor design or applied filters, and consequently, only specifically designed gravimeters can detect these waves easily (Niebauer et al, 2011). 3.…”

Section: Effects Of Earthquakes On Gravity Readingsmentioning

confidence: 99%

Microgravity surveying before, during and after distant large earthquakes

Boddice

Metje

Tuckwell

2022

Journal of Applied Geophysics

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“…Finally, the hourly iGrav data needed some editing during a few seismic sequences as the amplitude of the seismic signal exceeded its dynamic range (Figure 6b). This was not necessary for the gPhoneX#32 (Figure 6a), as it has a larger dynamic range, the seismic events are removed by the low-pass filtering (Niebauer et al, 2011).…”

Section: Data Pre-processingmentioning

confidence: 99%

Long‐Term Stability of Tilt‐Controlled gPhoneX Gravimeters

et al. 2019

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Spring relative gravimeters are considered too unstable to provide useful information on long-term gravity variations. In this paper, we prove that the new generation of spring gravimeter gPhoneX can reach long-term stability at the μGal level (10 nm s −2 ) when the verticality of the gravimeter is maintained, if the instrumental drift can be correctly estimated. We conducted two comparisons with different gPhoneXs in different observatories and environmental conditions. In the "Walferdange Underground Laboratory for Geodynamics" in Luxembourg, we compared time series from the gPhoneX (with and without tilt control), with data from a superconducting gravimeter. We found an agreement at the μGal level when the tilt control is switched on. We validated this result by repeating the experiment at the "Geodesy in Karstic Environment" observatory in the south of France. The fit between the superconducting gravimeter and the gPhoneX hourly values gives similar results at all frequencies over 276 days of measurements. The linear correlation coefficient between the gPhoneX and superconducting gravimeter reaches 0.99, with a misfit of 6.0 nm s −2 . We demonstrated that tilt-controlled gPhoneXs are suitable for long-term gravity monitoring.

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“…SG mampu merekam aktivitas kebumian lainnya, hingga kejadian seismik, baik yang mikroseismik maupun yang makroseismik (Lan et al 2011), (Shen at al. 2011), (Zhang, K and Ma 2014) dan respons yang diberikan alat gravimeter berkorelasi dengan hasil pencatatan saat terjadi gempa bumi (Niebauer et al 2011 (Baldi et al 1995), dinamika resonansi mantel bumi (Omerbashich 2007) efek hidrologi (Virtanen 2006) dan beberapa indikasi perubahan alam lainnya. Akan tetapi, untuk mendapatkan nilai gaya berat yang dipengaruhi oleh gempa bumi, hanya dilakukan koreksi pasang surutnya saja.…”

Section: Pendahuluanunclassified

Comparison of Rayleigh Wave Characteristics on Superconducting Gravimeter and Sesimometer LHZ Recordings

Rande¹,

Yusuf²,

Parera³

2019

j. widyariset

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The vibrations of an earthquake can be properly recorded by the gravimeter. As a gravimeter, superconducting gravimeter (SG) has a very high accuracy; slightly different with general gravimeter. Rayleigh wave is the wave with the largest amplitude in earthquake, so it will be clear on SG tape. In this research, we use certain superconducting gravimeter (SG) and seismometer LHZ, spread over several locations around the world; just to know more about earthquakes occurring in the Vanuatu Islands (7.1 Mw) and Afghanistan (7.5 Mw) in October 2015. This research focuses on instrument responsse that records earthquake events that aims to know comparison of the characteristics of the Rayleigh wave on both instruments. Tidal value reduction were applied on SG's recording in order to get true gravity value. Then we did time-integral to get velocity and displacement. By using spectrogram function, we can display frequency of SG and LHZ. The amplitude of the Rayleigh wave recorded on the SG is smaller than that recorded on the LHZ and has signal correlation > 7.0. In any case of Rayleigh Global waves, SG is able to record clearly the phase of Rayleigh wave to phase R6 in the earthquake of Vanuatu and R7 in the Afghanistan earthquake, while LHZ only records up to the R4 and R5 phase. The spectrograph analysis reinforces the differences in the viewing screens of SG and LHZ Rayleigh Global waves in the frequency domain, R7 recorded on SG has a frequency range of 0.002 Hz to 0.006 Hz.

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Monitoring earthquakes with gravity meters

Cited by 15 publications

References 2 publications

Microgravity surveying before, during and after distant large earthquakes

Microgravity surveying before, during and after distant large earthquakes

Long‐Term Stability of Tilt‐Controlled gPhoneX Gravimeters

Comparison of Rayleigh Wave Characteristics on Superconducting Gravimeter and Sesimometer LHZ Recordings

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