MOIST
Multidisciplinary Oceanic Information SysTem

GNDT 1 - Seismometer - RAW dataset

Metadata

Instrument: Guralp CMG-1T 3 component broadband seismometer (360 s-50 Hz)
Investigator: Stephen Monna (INGV)
Project: GNDT-SN1
Observatory: NEMO-SN1

Abstract: This digital database comprises seismological data recorded during the GNDT 1 project by a 3 component broadband seismometer, together with a hydrophone. The sensor was installed on the GEOSTAR deep-sea multidisciplinary observatory, offshore of the Eastern coast of Sicily (Southern Italy) at a depth of 2071 m. The seismometer is installed in a dedicated vessel integrated in a separate structure connected to the observatory via a special mechanical release. To guarantee a good coupling with the sea bottom, the structure is disconnected just after the observatory touch-down and kept linked to the frame by a slack rope (Favali et al., 2006). The sensor was connected to a 24 bit digitizer, and its time reference came from an external rubidium clock connected to the digitizer.

Purpose: This project's main objective was to establish the first node, off-shore eastern Sicily, of multiparameter seafloor observatories which include a seismometer. Long-term broad-band seismic measurements from this site is of great interest given its proximity to the Etna volcano (~ 50 km) and to offshore seismogenic structures where some of the most destructive earthquakes, some of which accompanied by tsunamis, have occurred in Italy.

Quality of data: