The data set comprise processed active-source seismic data collected with ocean bottom seismometer (OBS). The seismic shots were recorded in the Guatemala Basin studying the structure of oceanic crust. Data were obtained during the expedition JC228 of the research vessel RRS JAMES COOK in December 2022. The data set consists of 35 OBS stations deployed at an interval of approx. 7 km receiving shots of a tuned 5000 cubi-inch airgun array, fired at 90 s interval. The seismic line is a 220 km long West-East trending transect running in flowline dircetion of seafloor spreading. Each OBS consists of 4 channels (channel 1: hydrophone; channel 2: horizontal component 1; channel 3: horizontal component 2; channel 4: vertical component).

The data are provided in SEG-Y format (reduced with 6 km/s and recording time starting at -1 s). Each uploaded file (140 files in total) consists of the airgun shots recorded with the individual Ocean-Bottom-Seismometers (OBS).The naming convention is as follows using one file p200.obs201.1.sgy as an example:p200: profile name of JC228 surveyobs201: OBS-station number (from 201 to 235)1: channel number (1, 2, 3, 4)sgy: data typeEach segy-data file has header-information set that can be used for plotting and analyses:trace-count (tracr, byte : 1) shotpoint number (byte: 17-20)shot X coordinate (sx, byte :73-76, coordinate: latitude x 360000)shot Y coordinate (sy, byte: 77-80, coordinate: longitude x 360000)OBS X coordinate (gx, byte: 81-84, coordinate: latitude x 360000)OBS Y coordinate (gy, byte: 85-88, oordinate: longitude x 360000)Binary: p200.obs201.ch1.sgyContent: Ocean Bottom Seismometer continuous seismic processed data / SEGY data format