This dataset contains raw data, drift corrected data and SeisComP 3 Data Structure (SDS) from Ocean Bottom Seismometers (OBS) deployed at EMSO-Azores from July 2011 to July 2012. The raw data are initialy in Lcheapo format. They are fixed at first to remove bugs and they are transformed to miniSEED format. The drift corrected data are obtained from fixed raw data. The drift corrected data are obtained from fixed raw data. A value is put in the Time Correction eld (eld 16) of each data header. By default, the correction is applied to the Record Start Time (eld 8) and the Time Correction Applied ag (eld 12, bit 1) is activated. Alternatively, only the Time Correction Applied eld is changed. Seiscomp3 Data Structure (SDS) is the final product. It's the correct structure to be use in the Seiscomp 3 software.