Geodetski list, Vol. 67 (90) No. 2, 2013.
Izvorni znanstveni članak
Instrumentation of the Earth-breathing monitoring Station at the Faculty of Mining Geology and Petroleum Engineering, Zagreb
Radovan Marjanović Kavanagh
; Rudarsko-geološko-naftni fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Sažetak
At the Faculty of Mining Geology and Petroleum engineering of the University Zagreb for the first time in our country a station for Earth-breathing monitoring was successfully established. Different instruments are included in the station operation such as a permanent Trimble GNSS station, a vertical extensometer, a two-component tilt-meter, an one-component tilt-meter and a LaCoste & Romberg Earth-tide gravity-meter (model ET 16). The GNSS antenna is fixed on the terrace over the mining shaft and with a cable connected to the receiver which is via LAN connected to the host computer. All other measuring instruments are connected to a data logger which is also connected to the host computer. In the same room with the data logger all control equipments for the installed instruments are placed. The gravity-meter, tilt-meter and the vertical extensometer are equipped with a capacitive sensor and the same condenser plates of the gravity-meter are used for the electrostatic feedback. All these electronics was developed by the author. Signals from the measuring instruments are directly or over a Butterworth low-pass filter (18 dB/octave and T=100 s) connected to the data logger. Besides signals from the mentioned instruments several other sensors for barometric pressure and temperature inside the instruments and the surrounding space are registered. The registration could be followed on the computer display by means of the FLUKE graphic program Trend-link. For calculation purposes with other standard statistic programs the Data are saved in ASCII format as CSV (Comma Separated Values). It is foreseen that the registered time series will be processed with Fourier spectral analyses programs so as correlation and covariance analyses. A special meaning of this research is that for the first time in our country using a precise gravity-meter elastic parameters of the Earth and a comparison to the theoretically parameters will be determined so as maximally Earth-tide amplitudes for this location. Also the exact determination of building resonance frequencies is of big importance especially for the future earthquake risk system which must become a standard process in building hazard zoning in cities.
Ključne riječi
gravity-meter; 2-component-tilt-meter; vertically extensometer; capacitive sensor; Fourier spectral analysis; correlation analysis; covariant analysis; Earth's elastic parameters; resonant frequency of buildings; earthquake and micro seismic registrations
Hrčak ID:
104405
URI
Datum izdavanja:
22.6.2013.
Posjeta: 1.326 *