Gravity Measurements in Panama with the IMGC-02 Transportable Absolute Gravimeter
The work hereafter described was designed to determine the gravity datum at the Centro Nacional de Metrologìa de Panamà CENAMEP AIP through absolute measurement of the gravity acceleration, and settle a gravity network in Panama. Twelve gravity station po
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Gravity Measurements in Panama with the IMGC-02 Transportable Absolute Gravimeter G. D’Agostino, A. Germak, D. Quagliotti, O. Pinzon, R. Batista, and L.A. Echevers
Abstract The work hereafter described was designed to determine the gravity datum at the Centro Nacional de Metrologìa de Panamà CENAMEP AIP through absolute measurement of the gravity acceleration, and settle a gravity network in Panama. Twelve gravity station points were settled. Gravity data were collected with the transportable absolute ballistic gravimeter IMGC-02, operated by a team of the Istituto Nazionale di Ricerca Metrologica INRIM, in cooperation with the CENAMEP AIP and the Instituto Geográfico Nacional “Tommy Guardia” IGNTG. Establishment of the gravity net in Panama, with the highest accuracy currently obtainable, will help in the realization of primary standards and in the definition of the geodetic reference level. Moreover the gravity net may serve as reference for further detailed surveys and detection of long-term, time-dependent gravity variations.
14.1 Introduction The Centro Nacional de Metrologìa de Panamà CENAMEP AIP is responsible for developing, preserving and maintaining the national measurement standards in the country. Nowadays CENAMEP AIP performs calibrations concerning mechanical, thermal, time and electrical units. With respect to mechanical quantities, the knowledge of the local gravitational
G. D’Agostino () INRIM, Istituto Nazionale di Ricerca Metrologica, Torino IT-10135, Italia e-mail: [email protected]
acceleration g is required for the realisation of the force unit and its derived units (e.g. pressure). Aiming at the lowest uncertainty nowadays possible, the CENAMEP AIP began searching for laboratories that could accurately measure the g value. After examining the laboratories CENAMEP AIP contacted the Istituto Nazionale di Ricerca Metrologica INRIM, Italy, where, since the 1970s, it has been developed and tested a transportable absolute ballistic gravimeter, the present versions called IMGC-02. Originally the project foresaw a single measurement station at the CENAMEP AIP, but, considering the opportunity to have the measuring equipment in Panama, the project was extended by adding other measurement points. Therefore CENAMEP AIP contacted the Istituto Geografico Nacional “Tommy Guardia” IGNTG to advise on the location of the measurement points. IGNTG choose eleven points of a gravity network that will help also in a better definition of the Panama geoid. Following the scheduled activity, in January and February 2008, twelve absolute gravity measurements were carried out in Panama with the IMGC-02. Subject of the paper is the results of the measurements.
14.2 The IMGC-02 Transportable Absolute Gravimeter The present instrument, the IMGC-02, has been completely developed and tested at the INRIM laboratories, see D’Agostino (2005). A picture of the apparatus is
S.P. Mertikas (ed.), Gravity, Geoid and Earth Observation, International Association of Geodesy Symposia 135, DOI 10.1007/978-3-642-10634-7_14, © S
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