For two months, ground motions induced by natural seismicity were recorded
by 4 dense arrays. each of them including 9 seismological receivers. The ta
rget zone is a 400 km(2) area and displays a characteristic topographic org
anization. The sites correspond to flat valleys filled with surficial soft
sediments. The data recorded during this experiment will be used to charact
erize the wavefields through the different valleys (main energetic azimutha
l contributions. apparent velocities) in the aim to quantify site effects.
((C) Academie des sciences / Elsevier. Paris.).