Near-bottom processed sidescan sonar Deep Tow data (mb132 format) from the East Pacific Rise at 17°S and 19°S (PANR06MV, 1998)

This data set presents processed sidescan sonar data collected using the Scripps Institution of Oceanography (SIO) deeply towed instrument package (Deep Tow) at 17°S and 19°S, East Pacific Rise, during the May 1998 cruise PANR06MV. The Deep Tow platform carried a 110 kHz sidescan sonar. The binary data files were originally recorded in SIO fish6 format, and have been converted to the MB-System-compatible .mb132 format (mbio format 132). Processing steps included translating time-based sonar data into backscatter records, and laid out into a regular array of pixels that were projected onto a flat seafloor model (swath bathymetric data were not collected). Data were corrected for the variation of amplitude with grazing angle, filtered with a Gaussian mean low-pass filter (across track /along track dimensions of 11 and 3 pixels, respectively), and mosaiced. A heading correction of 6 degrees was also applied to the sidescan sonar data. Processing carried out with MB-System release 5.7.6. The data set was generated as part of the project called Towards quantifying eruptive timing and volcanic accretion on the Southern East Pacific Rise. Funding was provided by NSF award OCE21-28301.