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The Very-Broad-Band Data Acquisition of the Long-Base Tiltmeters of Grotta Gigante (Trieste, Italy)

The Very-Broad-Band Data Acquisition of the Long-Base Tiltme...

作者： Carla Braitenberg Gianni Romeo Quintilio Taccetti IldikòNagy Dipartimento di Scienze della Terra Università di TriesteVia Weiss 1 34100 Trieste Istituto Nazionale di Geofisica e Vulcanologia Via di Vigna Murata 605 00143 Roma Istituto Nazionale di Geofisica e Vulcanologia Via di Vigna Murata 60500143 Roma

The horizontal pendulums of the Grotta Gigante (Giant Cave) in the Trieste Karst are long-base tiltmeters with Zllner type suspension. The instruments have been continuously recording tilt and shear in the Grotta Gigante since the date of their installation by Prof. Antonio Marussi in 1966. Their setup has been completely overhauled several times since installation, restricting the interruptions of the measurements though to a minimum. The continuous recordings, apart from some interruptions, cover thus almost 40 years of measurements, producing a very noticeable long term tiltmeter record of crustal deformation. The original recording system, still in function, was photographic with a mechanical timing and paper-advancing system, which has never given any problems at all, as it is very stable and not vulnerable by external factors as high humidity, problems in power supply, lightning or similar. In December 2003 a new recording system was installed, based on a solid-state acquisition system intercepting a laser light reflected from a mirror mounted on the horizontal pendulum beam. The acquisition frequency is 30 Hz, which turns the long-base instrument to a very-broad-band tiltmeter, apt to record the tilt signal on a broad band of frequencies, ranging from secular deformation rate through the earth tides to seismic waves. Here we describe the acquisition system, present the up to date long term recording, and the observation of a recent earthquake.

关键词： geodetic underground measurements Secular crustal deformation Tiltmeter

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