Yann Hello - Research pages

OBS: My main interest goes in developing sub-marine instrumentation, mainly for earthquake or seismic application. I've started building and designing Ocean Bottom Seismometer in the early 1983. Through analog to first digital instrument, I've lead the design and construction of several generation of OBS up to the last generation of current Geoazur OBS pool. "Hippocampe" is able to record signal from short period (Geophones) or Broad Band sensor (40s) and an Hydrophone over a period of six month to a year. "Lady Bug" model is frankly oriented to be used for Wide Angle refraction experiment. It carries the same features as the Hippocampe but in a light version easier to handle for rapid turnover. Low frequency sensors can also be carried to enlarge recording capability in case of using these instruments after a post seism event like for the Haïti 12 January 2010 dramatic event. Both instruments are light and have already been deployed and recovered from opportunity ship.

 

Real Time Monitoring:My recent work is oriented to monitor seismic activity in real time. It started few years ago with Antares experiment. Antares is a Neutrinos underwater detector installed in Mediterranean sea off-shore Toulon. Attached to the detector we've installed few years ago a 360s Broad band instrument. Check Underwater Observatory

MUG:Since then I am developing in the frame of Prima - Technological Underwater Development Platform - a semi-permanent Multi Geophysics Sensor (MUG) based around a Broad band seismometer. This sensor will be connected to a network for real time monitoring or could also be used in autonomous mode. In that case shuttles within a copy of data are called from surface by acoustic to pop up. Up to six shuttles can be launch over a three years autonomy period.

Mermaid: Working on mermaid project is a next challenge and a different approach for monitoring earthquake. We have already developed our own acquisition module to fit in existing Float. By working very closely with people involved in the Argo program, we hope in a near future to propose a puridisciplinary Float unit.