A Network of Superconducting Gravimeters Detects Submicrogal Coseismic Gravity Changes

Science ◽  
2004 ◽  
Vol 306 (5695) ◽  
pp. 476-478 ◽  
Author(s):  
Y. Imanishi
Keyword(s):  
Gravity Changes ◽  
Superconducting Gravimeters

Hydrologic changes of in-situ gravimetry

Geophysics ◽  
2021 ◽  
pp. 1-46
Author(s):  
Min Zhang ◽  
Ziwei Liu ◽  
Qiong Wu ◽  
Yuntian Teng ◽  
Xiaotong Zhang ◽  
...  
Keyword(s):  
Water Level ◽  
Water Levels ◽  
Background Information ◽  
Specific Yield ◽  
Specific Storage ◽  
Aquifer Storage ◽  
Gravity Changes ◽  
Superconducting Gravimeters ◽  
Local Hydrology

Inter-seasonal and geodynamics-related gravity changes are important geoscientific signals that are extractable from gravimeter observations after deducing background information as local hydrology gravity effect. With two superconducting gravimeters (SGs, OSG-053 and iGrav-007) located in different tectonic units, continuous Global Navigation Satellite System data, and AG observations, Wuhan (China) is an ideal location for investigating the effects of gravity resulting from significant local hydrology mass variations. We processed ∼26 months of gravity data collected from the SGs in Wuhan and obtain residuals of -40 nm.s2 for OSG-053 and 100 for iGrav-007. The hydrological observations show an estimated gravity increase of 42 nm.s2 near iGrav-007, which mainly resulted from the increased unconfined water level with an aquifer-specific yield of approximately 0.1. However, the gravity changes around OSG-053 are mainly from soil moisture and reach -90 nm.s2. The soil type, thickness and water content parameters were obtained from hydrogeological survey and drilling data. The deep confined water level rose by 2.5 m, which introduced a 1 nm.s2 gravity variation with a specific storage about 0.00001 from field unsteady flow pumping test. The modeled gravity is approximately -40 nm.s2 around OSG-053 and 90 around iGrav-007, in accordance with the observed gravity variations. The difference in gravity changes between the two SG observations can be explained by different local water storage environments. Our results suggest that unconfined and soil water significantly impact the in-situ gravimetry, which indicates that further detailed hydrogeological surveys are required. A combined investigation of gravity and water levels can be a useful approach to monitor aquifer storage conditions and groundwater management.

The benefits of performing continuous gravity measurements at active volcanoes using superconducting gravimeters

2020 ◽  
Author(s):  
Filippo Greco ◽  
Daniele Carbone ◽  
Flavio Cannavò ◽  
Alfio Messina ◽  
Danilo Contrafatto ◽  
...  
Keyword(s):  
Time Scales ◽  
Active Volcano ◽  
Continuous Measurements ◽  
Gravity Changes ◽  
Superconducting Gravimeters ◽  
Close Proximity ◽  
Gravity Measurements ◽  
Long Time ◽  
Changes Over Time ◽  
Active Volcanoes

<p>Continuous gravity measurements at active volcanoes are mostly accomplished using spring gravimeters, that can be operated under harsh field conditions. Unfortunately, these instruments do not provide reliable continuous measurements over long time-scales, due to the instrumental drift and artifacts driven by ambient parameters.</p><p>An alternative to spring devices for continuous measurements is given by superconducting gravimeters (SGs), that are free from instrumental effects and thus allow to track even small gravity changes over time-scales from minutes to years. Nevertheless, SGs cannot be deployed in close proximity to the active structures of tall volcanoes, since they need host facilities with main electricity and a large installation surface.</p><p>The mini-array of three SGs that were installed on Etna between 2014 and 2016 makes the first network of SGs ever installed on an active volcano. Here we present results from these instruments and show that, even though they are installed at relatively unfavorable positions (in terms of distances from the summit active craters), SGs can detect volcano-related gravity changes that would otherwise remain hidden, thus providing unique insight into the bulk processes driving volcanic activity.</p>

Cultured stem cells are sensitive to gravity changes

2006 ◽  
Author(s):  
L.B. Buravkova ◽  
Yu.A. Romanov ◽  
N.A. Konstantinova ◽  
N.V. Merzlikina ◽  
Yu.G. Gershovich ◽  
...  
Keyword(s):  
Stem Cells ◽  
Gravity Changes

scholarly journals Gravity changes and crustal deformations before the Menyuan, Qinghai Ms6.4 earthquake of 2016

2019 ◽  
Vol 10 (4) ◽  
pp. 315-320 ◽  
Author(s):  
Shusong Guo ◽  
Guoqing Zhang ◽  
Yiqing Zhu
Keyword(s):  
Gravity Changes
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