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Abstract. A new portable magnetometer theodolite with fluxgate sensor has been developed for measuring the components of the earth's magnetic field. With this instrument, used as a null detector, it is possible to make absolute measurements of declination (D) and inclination (I). The compensation of the main magnetic field allows direct intensity measurements (H, X, Y, Z components); in this case the calibration is made by reference to a proton magnetometer.The observation procedure is particularly easy and quick. The accuracy is better than 5 sec of arc for D and I and better than 1 nT for direct intensity measurements.

GEOSCOPE is a global three-component digital broadband seismological network deployed by France. It presently counts 22 stations, with a final goal of 25 stations, representing the French contribution to the new generation global seismological network, an international effort coordinated through the Federation of Digital Seismic Networks, and the basic tool for global seismology of the 1990s.

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