As part of RV Polarstern cruise PS64, 28 seismic reflection profiles were collected between the Greenland and Jan Mayen fracture zones to study the conjugate volcanic margins off East Greenland and mid-Norway. Detailed data acquisition parameters for the profiles are documented in the expedition report (Jokat, 2004). Metadata, recording parameters, and the seismic data processing sequence are documented in the EBCDIC-Headers enclosed in the seg-y files. Navigation information is included in the seg-y headers, in the Shot-list files and Navigation files (see raw data). A ReadMe file additionally lists the metadata and recording parameters for each seismic profile. The data set is grouped into three categories: 1. Raw data comprise (a) demultiplexed seismic data in seg-y format, (b) a shot list of date, time and shot-number, and (c) navigation data with date, time, and coordinates. 2. Primary data consist of (a) CDP-sorted data in seg-y format, and (b) navigational data in a conventional UKOOA- file. 3. The data product is provided as stacked version of the seismic profile in seg-y format.