Integrated Ocean Drilling Program Expedition 340 involved drilling in marine sediment and volcaniclastic material at nine sites located off the islands of Montserrat and Martinique, The overarching aim of the Expedition is to reach a better understanding of the constructive and destructive processes occurring along the Lesser Antilles volcanic arc. Two holes were planned for each of the nine sites, and logging was planned for eight sites. The primary objectives of this expedition were
1. To drill through the chaotic units (as identified in the seismic data) interpreted as mass wasting deposits and to better understand their composition, origin, and relationship to on-land volcanic flank-collapse events.
2. To core as many tephra layers as possible for tephrochronology studies designed to reconstruct the history of the volcanoes of both Montserrat and Martinique and the long-term magmatic evolution of the arc.
3. To retrieve a complete sediment record from each of the sites to study the sedimentation processes occurring along the entire volcanic arc.
Anne Le Friant (CNRS Institute of Earth Physics, Paris), Osamu Ishizuka (Geological Survey of Japan)