EarthByte Earth Seafloor Crustal Age ------------------------------------ .. figure:: /_static/EarthByte_logo_small.png :align: right :scale: 20 % .. figure:: /_static/GMT_earth_age.jpg :width: 710 px :align: center Numerous geodynamic and geophysical studies consider both the seafloor depth and the seafloor crustal age. `EarthByte `_ has pioneered the creation of crustal age grids since 1997 and we offer their latest version for remote use in GMT. Usage ~~~~~ You access a global crustal age grid by specifying the special name @earth_age[_\ *rru*\ [_\ *reg*\ ]] The following codes for *rr*\ *u* and the optional *reg* are supported (dimensions and sizes are listed for pixel-registered grids; gridline-registered grids increment dimensions by one): .. _tbl-earth_age: .. table:: EarthByte Earth Seafloor Crustal Age. An asterisk denotes tiled datasets. ==== ================= === ======= ================================================== Code Dimensions Reg Size Description ==== ================= === ======= ================================================== 01d 360 x 180 g,p 73 KB 1 arc degree global seafloor ages (1 min @ 315 km) 30m 720 x 360 g,p 204 KB 30 arc minute global seafloor ages (1 min @ 157 km) 20m 1080 x 540 g,p 401 KB 20 arc minute global seafloor ages (1 min @ 105 km) 15m 1440 x 720 g,p 658 KB 15 arc minute global seafloor ages (1 min @ 79 km) 10m 2160 x 1080 g,p 1.3 MB 10 arc minute global seafloor ages (1 min @ 52 km) 06m 3600 x 1800 g,p 3.0 MB 6 arc minute global seafloor ages (1 min @ 32 km) 05m* 4320 x 2160 g,p 4.6 MB 5 arc minute global seafloor ages (1 min @ 26 km) 04m* 5400 x 2700 g,p 5.8 MB 4 arc minute global seafloor ages (1 min @ 21 km) 03m* 7200 x 3600 g,p 11 MB 3 arc minute global seafloor ages (1 min @ 16 km) 02m* 10800 x 5400 g,p 18 MB 2 arc minute global seafloor ages (1 min @ 11 km) 01m* 21600 x 10800 g 50 MB 1 arc minute global seafloor ages (1 min original) ==== ================= === ======= ================================================== See :gmt-docs:`GMT remote dataset usage ` for when resolution codes are optional or required. All of these data will, when downloaded, be placed in your ~/.gmt/server directory, with the earth_age files being placed in an ``earth/earth_age`` sub-directory. If you do not specify a CPT, the default CPT for this dataset (*@earth_age.cpt*) will be used. Technical Information ~~~~~~~~~~~~~~~~~~~~~ We scale and reformat the original data to take up very little space so that downloads from the servers are as fast as possible. For the seafloor crustal age grid this means we chose 0.01 Myr as the smallest data unit, which is well below the uncertainties in the model. Data are scaled and shifted to fit in a short integer grid that is highly compressed by netCDF lossless compression and chunking. The data are reported in Myr relative to the 2012 Geological Time Scale. Data References ~~~~~~~~~~~~~~~ #. Seton et al., 2020: [https://doi.org/10.1029/2020GC009214].