RV Investigator Voyage IN2022_V02 EK60/EK80 Echosounder

This record describes scientific split-beam echosounder data collected on the RV Investigator voyage IN2022_V02, titled "Sedimentation at its extreme: how powerful are submarine caldera-forming eruptions (Kermadec arc)?" The voyage took place between March 15, 2022 and April 19, 2022 (AEST), departing from Hobart and returning to Hobart. The main area of survey was the Kermadec arc off of New Zealand.

The Simrad EK60 split beam GPT for 18kHz and Simrad EK80 split beam WBTs for 38, 70 120, 200 and 333 kHz were used to acquire acoustic backscatter data to a range of 1500 m during transits and to full ocean depth while at the New Zealand/Kermadec survey area. All frequencies were logged continuously for the extent of the voyage, except for a period of time between 26/03/2022 05:00 and 29/03/2022 11:05 UTC when all data recording was mandated to be suspended. The 70kHz was occasionally set to passive while in shallow water to limit interference with the EM710 multibeam.

Data are stored in *.raw, *.bot and *.idx format at CSIRO. There are 1773 files totalling 110 GB of raw data in this dataset.

Transit data between Hobart and the New Zealand EEZ were post-processed for the Integrated Marine Observing System (IMOS) and posted to the Australian Ocean Data Network (AODN) Portal.

Additional information regarding this dataset is contained in the GSM data acquisition and processing report. Additional data products may be available on request.