Marine Geoscience Data System
FK190726 Gravity:Anomaly:FreeAir
Gravity Free-Air Anomaly data (gridded format), Emperor Seamounts and Hess Rise, R/V Falkor cruise FK190726 (2019, investigators Les Watling, John R. Smith, Fabio C. Tontini)
These processed free-air gravity anomaly grids were derived from the free-air line-data (FA_clean) at 9 sites and have been gridded at ~500 m resolution using a minimum-curvature algorithm, and exported as GMT grids. The raw gravity data was acquired using a portable Lacoste & Romberg gravimeter with an Ultrasys control system. The gravity surveys were conducted at the Hess Rise and Emperor Seamounts in the North Central Pacific Ocean during R/V Falkor cruise FK190726. The cruise was primarily a biogeographic study using ROV SuBastian and the surveys were designed for ROV dive site selection and multibeam gap filling when time allowed. The data set is divided into 10 sites (places where a dedicated survey with nearly parallel lines was conducted) and 8 transits between these sites. Transits are sequentially ordered starting from Honolulu, Hawai'i to Hess Rise and on to the Emperor Seamounts with a return transit to Honolulu along the northern side of the Northwest Hawaiian Ridge. The Emperor Seamounts surveyed include Suiko, Yomei, Godaigo, Nintoku, Jingu, Annei, and Koko (from north to south, respectively). The data files are in GMT-compatible netCDF grid format and were generated as part of a project called Deep Coral Diversity at Emperor Seamount Chain 2019. Funding was provided by a grant from Schmidt Ocean Institute (Ship, ROV, gravimeter) to Les Watling, PI, and from NOAA OER (Science support) to John R. Smith, PI.
Watling, Les
Smith, John R.
Tontini, Fabio
Device Info
L and R:S-80
The data have been processed/modified to a level beyond that of basic quality control (e.g. final processed sonar data, photo-mosaics).

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