{
 "about": "The record of this Plate: the facts it is drawn from, kept inside the work. Plain JSON; the artwork does not read it. CC0 1.0, no rights reserved.",
 "work": {"title": "Rivera", "series": "Plates", "artist": "Kenny Lienhard", "year": 2026, "plate": "47 of 52", "palette": "obsidian"},
 "plate": {"name": "Rivera", "code": "RI", "model": "PB2002 (Bird 2003)", "class": "micro", "area_km2": 100892, "centroid_lat_lon": [20.043, -107.396], "ocean_share": 1.0, "land_share": 0.0},
 "motion": {"frame": "no-net-rotation", "euler_pole_lat_lon": [21.1596, -107.5034], "rotation_deg_per_million_years": 4.23525, "speed_mm_per_year_at_centroid": 9.21, "heading_deg_at_centroid": 84.9, "speed_range_mm_per_year": [0.0, 30.75], "the_artwork_drifts": "9.21 mm a year along its cut, one frame of rock every 25746 years"},
 "cover": {"deep ocean": 0.6492, "slope and ridge": 0.3508},
 "palette_from": ["deep ocean", "ocean"],
 "era": null,
 "past": {"account": "The past. The Rivera plate is all deep sea, about 1,500 to 5,800 metres down, so when the ice age sea stood more than 120 metres lower none of it became land, and its water stayed far too warm for sea ice. At the ice age peak, about 20,000 years ago, the surface sea here was about 4 degrees colder than today, near 23 degrees against 27, and it began to warm about 17,000 years ago. Along the Mexican coast just north of it, upwelling and plankton were weaker in the cold.", "source": "ETOPO 2022; Lambeck et al. 2014, PNAS 111:15296; Osman et al. 2021, Nature 599:239; Ganeshram and Pedersen 1998, Paleoceanography 13:634"},
 "history": [{"years_ago": 10000000, "range_years_ago": [10500000, 9500000], "what": "The Rivera plate was already moving on its own, apart from the Cocos plate.", "source": "DeMets and Traylen 2000, Tectonophysics 318:119, doi:10.1016/S0040-1951(99)00309-1"}, {"years_ago": 9700000, "range_years_ago": [10185000, 9215000], "what": "The oldest ocean floor on this plate formed.", "source": "Seton et al. 2020, age grid v2020.1 processed here, Geochemistry Geophysics Geosystems, doi:10.1029/2020GC009214"}],
 "outline_lon_lat": [[[-107.59, 21.74], [-107.77, 21.74], [-107.93, 21.69], [-108.11, 21.72], [-108.4, 21.83], [-108.58, 21.9], [-108.67, 21.77], [-108.78, 21.64], [-108.87, 21.54], [-108.94, 21.45], [-108.98, 21.35], [-108.81, 21.25], [-108.92, 21.07], [-109.01, 20.95], [-109.11, 20.82], [-109.19, 20.74], [-109.26, 20.64], [-109.28, 20.56], [-109.19, 20.5], [-109.22, 20.4], [-109.32, 20.24], [-109.38, 20.18], [-109.37, 20.14], [-109.45, 20.03], [-109.16, 19.81], [-108.9, 19.63], [-108.9, 19.55], [-108.53, 19.38], [-108.2, 19.22], [-108.23, 19.11], [-107.82, 18.94], [-107.52, 18.86], [-107.27, 18.76], [-107.0, 18.65], [-106.76, 18.59], [-106.53, 18.54], [-106.24, 18.52], [-106.28, 18.28], [-106.31, 18.12], [-106.32, 18.02], [-106.31, 17.93], [-105.59, 17.88], [-105.51, 18.14], [-105.44, 18.36], [-105.35, 18.55], [-105.25, 18.76], [-105.55, 18.98], [-105.74, 19.16], [-105.95, 19.4], [-106.12, 19.64], [-106.27, 19.92], [-106.35, 20.2], [-106.39, 20.43], [-106.39, 20.64], [-106.38, 20.84], [-106.44, 21.12], [-106.53, 21.18], [-106.55, 21.24], [-106.62, 21.31], [-106.76, 21.48], [-106.81, 21.64], [-106.86, 21.72], [-106.89, 21.8], [-107.05, 21.75], [-107.17, 21.75], [-107.39, 21.75], [-107.59, 21.74]]],
 "sources": ["Plate outlines and motion: Bird, P. (2003). An updated digital model of plate boundaries. Geochemistry, Geophysics, Geosystems 4(3), 1027, doi:10.1029/2001GC000252. No-net-rotation frame computed from PB2002 alone.", "What covers each plate: ESA CCI Land Cover and Water Bodies, NOAA ETOPO 2022, Koppen-Geiger climate maps, NSIDC Sea Ice Index, on a 1 arc-minute grid."],
 "engine_sha256": "a7fbc03acc0fc9ba343881bb88ddaf2b7564564d8bc9cbed16e75e47e01fb3f2"
}