Phase 2 of the experiment is passive and longer in duration. Seismometers have been distributed on islands spanning distances of nearly 500 km; Coetivy and Alphonse are the most southerly islands and Bird the most northerly. The instruments have been deployed for roughly a year starting in February 2003. Distant earthquakes (more than 3000 km away) will be used to image the deep Earth structure beneath the plateau. We hope to image any plume signal in the plate and illuminate potential boundaries between oceanic and continental domains.

An example of a seismic trace