The Cameroon experiment will evaluate models for the origin of volcanic lines without age progression (hot lines) by examining the seismic structure of the crust and upper mantle beneath one of the most easily accessible hot lines,the Cameroon Volcanic Line (CVL). Using data from a 21-month passive-source broadband seismic experiment in Cameroon, we will image crustal and upper mantle seismic anomalies associated with the CVL using a number of proven modeling techniques, including body and surface wave tomography, receiver functions, and shear wave splitting.