Sentences with phrase «gravity anomalies»
The phrase "gravity anomalies" refers to variations in the force of gravity on Earth's surface. It means that in some places, the pull of gravity is stronger or weaker than the average. Scientists study these anomalies to better understand the composition and density of Earth's subsurface materials, such as rocks, minerals, and even underground structures like mountains or large underground cavities. Full definition
Bentley, C.R., J.D. Robertson, and L.L. Greischar, Isostatic gravity anomalies on the Ross Ice Shelf, Antarctica, in Antarctic Geoscience (C. Craddock, ed.)
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While modern satellite - based techniques such as laser altimetery and gravity anomaly measurements provide important information on very recent changes, to get at the longer term we must rely on less direct methods.
Nine «hotspots» — areas analogous to Hawaii, with volcanism, broad topographic rises, and large positive gravity anomalies suggesting mantle plumes at depth — have been identified as possibly active.
«The new gravity map will be helpful for future Mars exploration, because better knowledge of the planet's gravity anomalies helps mission controllers insert spacecraft more precisely into orbit about Mars.
«With this new map, we've been able to see gravity anomalies as small as about 100 kilometers (about 62 miles) across, and we've determined the crustal thickness of Mars with a resolution of around 120 kilometers (almost 75 miles),» Genova said in the NASA statement.
On Europa the biggest density contrast is at the rock - ocean interface and we can therefore use gravity anomalies to look for heat flow as a proxy for volcanism.
Bentley, C.R., and J.D. Robertson, Isostatic gravity anomalies in West Antarctica, in Antarctic Geoscience (C. Craddock, ed.)
The NASA IceBridge Sander AIRGrav L1B Geolocated Free Air Gravity Anomalies, Version 1 data set available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC)... Read more»
Burov, E. B., and P. Molnar, Gravity anomalies over the Ferghana Valley (central Asia) and intracontinental deformation, J. Geophys.
I'd read about gravity anomalies being used to map changes in Amazon groundwater and something clicked: these data could be used to help to isolate surface emissions from wetlands which are controlled primarily by changes in groundwater and temperature.
Gravity anomaly map from NASA's GRACE (Gravity Recovery And Climate Experiment) measurements.
Furthermore, strongly anomalous results were concentrated over 1.5 kms of strike in close association with a gravity anomaly.
«The dates are not unequivocally 250 million years, the shocked minerals don't look like shocked minerals, and the gravity anomaly doesn't look like the gravity anomaly you'd get from an impact,» Rampino observes.
This diagram of a cross-section through Titan's ice shell shows features that may explain the gravity anomaly: a low - density ice lens created by regional basal freezing; a rigid ice shell that resists upward deflection; and surface weathering that keeps topography small.
Studying the gravity anomalies created by an impact is a powerful way to find out more about a crater — particularly one that is now buried, like the Chicxulub crater.
The gravity anomaly of the Lake Tüttensee crater (Fig. 8) is remarkable because of the ring - shaped zone of relatively positive anomalies surrounding the central negative anomaly.
Her visual score on gravity anomalies will be performed this year by ensembles in Shanghai, China and Hamburg, Germany.
The Gravity Recovery and Climate Experiment (GRACE) satellite, a joint project between NASA and the German Aerospace Centre, provided measurements of gravity anomalies, which the team related to groundwater height.