Mobile Earthquake Recording in Marine Areas by Independent Divers to Earthscope-Oceans.

Yann Hello*1, Sebastien Bonnieux1, Guust Nolet1, Olivier Philippe2, Manuk Yegikyan2

1Laboratoire Geoazur Sophia Antipolis, France (, 2Osean SAS, Le Pradet, France

Mermaid stands for Mobile Earthquake Recording in Marine Areas by Independent Divers. It is an autonomous free-drifting underwater robot that is already used for seismic tomography. Mantle plume imaged with floating seismometers!

To image anomalies inside the Earth, seismologists use seismic waves, much as a CAT scan in the hospital uses X-rays. But the comparison is flawed because there are almost no seismic stations in the oceans – imagine what would happen if 2/3 of the sensors in the hospital CAT scanner are down, and you get an idea of the difficulties we face. Covering.

A team of scientists from Princeton and the University of Nice (France) has recently worked to solve this problem by developing submarine robots, named ‘Mermaids’, that are capable to record the acoustic signals of earthquakes while floating at a depth of 1.5 km, and rise to the surface to transmit such seismograms by satellite.

They have created a network called Earth Scope Ocean: ESO, an international collaboration (France, China, US, Japan) is currently in the process of launching 47 MERMAIDS that is expected to operate for six years and provide unique seismic information where land stations or OBS are not available. This The ability of MERMAIDS to drift gives the array a station density that is comparable to that of US Array.