Processed Ocean Bottom Hydrophone (OBH) travel-time picks from the Great Meteor seamounts, northeast Atlantic Ocean (R/V Meteor, 1990)

The OBH data was acquired along five ~200 km-long profiles during R/V METEOR cruise No. 12/2 in the summer of 1990. Navigation during the cruise was controlled by the Global Positioning System (GPS). R/V Meteor was equipped with a source array of four 19-litre airguns, providing a total volume of 76 litres. Guns were towed at a depth of ~8 m and fired every 2 minutes at a pressure of ~140 bars, providing a dominant source frequency of 6 Hz. The OBH instruments were a prototype supplied by University of Hamburg and used in conjunction with University of Bergen air guns. The continuously-recorded analogue data were digitized at 100 samples per second and stored on Exabyte tapes. The digitised data was reprocessed in 2022/2023 using a predictive deconvolution and a simple Butterworth bandpass filtered from 4 to 15 Hz, and stored in SEG-Y file format. SEG-Y files have been reduced by 8 km/s. Record sections start at t = 0. The travel-time data of the main refraction branches were generated by hand-picking first breaks on OBH record sections. The first breaks were then compared to predictions based on tomographic models of the P-wave velocity structure of the oceanic crust and upper mantle along each profile of the Great Meteor Seamounts. The travel-time pick files are one of the inputs into the 2-D ray-tracing program RAYINVR (https://terra.rice.edu/department/faculty/zelt/rayinvr.html). The travel-time picks data files are in ASCII format and contain the observed travel time-distance pairs in the following format: [1] (First line) the x-coordinate (km) of the shot point, 1 if the receivers are to the right of the shot point or -1 if the receivers are to the left, 0, and 0 (format: 3F10.3, I10). [2] (Second line) the x-coordinate (km) of the observed data, the corresponding unreduced travel time (s), the estimated uncertainty of the travel time pick (s), and a non-zero integer used to identify the type of arrival to allow for the appropriate comparison with the rays traced (format: 3F10.3, I10). Line [2] is repeated for each pick corresponding to the shot point in line [1]. The sequence [1] and [2] is repeated for each shot point of the data set. [3] The file is terminated with the following line: 0, 0, 0, -1 (format: 3F10.3, I10). The data was collected under Deutsche Forschungsgemeinschaft grant We 690/27 1-4.