My previous works implied strong collaborations with physicists and mathematicians, in particular through CNRS Research Groups. These efforts are continuing. My main international collaborations include: the Massachussets Institute of Technology (USA), Rice University (USA), GFZ (Germany), Tohoku University (Japan) and UNAM (Mexico). I am also part in European projects involving numerous researchers from the EU and Switzerland. I have also strong links in China (CEA, USTC).