Location map of seismic wide-angle profiles offshore of Costa Rica with seafloor bathymetry illuminated from the NE. The positions of wide-angle profiles SO76-3, SO81-100, SO81-200 and SO81-300 are from Ye et al. (1996). Section 1 and section 2 are after Walther (2003). Line 101 is after Christeson et al. (1999). Stavenhagen-1998 line is after Stavenhagen et al. (1998). P15, P18, P22 and P24 profiles are from this study. SO81-4 (red line) used in this study is a MCS line coincident with our wide-angle profile 15.