Influence of temperature variations on the noise level of the data of the LaCoste and Romberg Earth tide gravity meter ET18

Hegewald, Anne; Jentzsch, G.; Jahr, T.

doi:10.1029/2010gc003432

Cited by 2 publications

(1 citation statement)

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“…Instrumental effects related to meteorological perturbations such as those produced by rainfall and variations in air temperature and humidity were expected to be very low in the short observation periods, during which the gravity residuals underwent remarkable changes. Correlation between relative air humidity and temperature can be often significant and, the gravimeter response depends on the different construction types and of their electrostatic feedback system [El Wahabi et al, 1997, 2000Pálinkás, 2006;Hegewald et al, 2011]. Figure 4g shows the residual gravity signal observed at LA and AU sites during the periods where remarkable changes were observed, together with the respective local air temperature variations.…”

Section: Methodology and Data Acquisitionmentioning

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: Methodology and Data Acquisitionmentioning

confidence: 99%