West side of the Condor Seamount, Faial, Azores

Passive seismic refraction

Seismometers

This dataset contains recordings obtained from five ocean bottom seismometers (OBS) made up of three-component Sercel SG-10 geophones and Scorpion Oceanic Ltd HT I-90-U hydrophones. The instruments belonged to the UK’s Geophysical Equipment Facility and Ocean Bottom Instrument Facility (GEF-OBIF) pool and were set to record at 2 kHz. The arrays were deployed at the western side of the Condor Seamount, Faial, Azores (Condor1: 38.64333333˚N, 29.16666667˚W; Condor2: 38.54666667˚N, 29.2˚W; Condor3: 38.62˚N, 29.10666667˚W; Condor4: 38.51833333˚N, 29.15833333˚W; Condor5: 38.615˚N, 29.22166667˚W) in February 2020 and recovered in June 2020 by the RV Arquipelago of the University of Azores. The OBSs were deployed immediately after synchronizing with GPS clocks but were recovered without synchronization (instruments were no longer logging). The data are provided in MiniSEED, a subset of the SEED (Standard for the Exchange of Earthquake Data) format and have not been processed further. Drift offsets have not been applied. A noise correlation between instruments suggests that the following offsets (linear from zero at start to these values at end of recording/recovery) should be applied to each instrument clock: OBS1 +500, OBS2 -300, OBS3 +900, OBS4 -200, OBS5 -400 ms. This dataset (500 GB in total) was collected under the UK Natural Environment Research Council’s (NERC) grant NE/T014814/1, held at the University of Manchester. The aim of the grant was to research a swarm of earthquakes felt on Faial Island, Azores, which began in the autumn of 2019, and to determine if an eruption had occurred. In addition, by recording at 2 kHz these data are also available to local marine biologists to study whale calls in the area.

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