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Authors: Greco, F.* 
Pistorio, A.* 
Currenti, G.* 
Del Negro, C.* 
Napoli, R.* 
Scandura, D.* 
Title: 4D Hybrid Microgravity Measurements: Two Case Studies of Monitoring at Mt. Etna Volcano and at a Gas Storage Reservoir in Northern Italy
Journal: Miscellanea INGV 
Series/Report no.: 12/(2011)
Issue Date: 2011
Keywords: Gravity
Subject Classification04. Solid Earth::04.02. Exploration geophysics::04.02.02. Gravity methods 
Abstract: Detection of clear gravity signals associated with the renewal of the volcanic activity and the emerging need of characterizing the dynamic changes of subsurface systems have led to increased application of the microgravity method in time-lapsed monitoring, also known as 4D gravity approach. Conventionally, microgravity measurements have been carried out using relative gravimeters, which measure spatial changes with respect to a fixed reference site. Since 2007, with the aim of comparing relative microgravity measurements routinely acquired on Etna with absolute gravity observations, we performed repeated surveys using transportable absolute gravimeters.
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