A real time seismological station at 2500 m depth in front Toulon

In the frame of a collaboration with ANTARES project, a broad band seismological sensor was installed on sea floor at 2500 m and connected to a data center for real time analysis. As expected, the long period seismic noise recorded is quite large, but the presence of a large set of others observations as temperature, pressure and current velocity provide some help to interpret the observed variation in time. The main improvement on the noise level was obtained in burring completely the sensor. The observations are still not at the level of the land observations with similar sensor, but the experience provided us some guides for the development of rules for the development of seismic sea floor permanent observation to complement land observatories in case of offshore seismicity.