{
 "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": "Shetland", "series": "Plates", "artist": "Kenny Lienhard", "year": 2026, "plate": "49 of 52", "palette": "obsidian"},
 "plate": {"name": "Shetland", "code": "SL", "model": "PB2002 (Bird 2003)", "class": "micro", "area_km2": 72266, "centroid_lat_lon": [-61.897, -59.003], "ocean_share": 0.9519, "land_share": 0.0481},
 "motion": {"frame": "no-net-rotation", "euler_pole_lat_lon": [46.8092, -142.3177], "rotation_deg_per_million_years": 0.25208, "speed_mm_per_year_at_centroid": 22.31, "heading_deg_at_centroid": 31.3, "speed_range_mm_per_year": [21.78, 22.79], "the_artwork_drifts": "22.31 mm a year along its cut, one frame of rock every 21425 years"},
 "cover": {"slope and ridge": 0.6042, "deep ocean": 0.1885, "shelf sea": 0.1592, "ice": 0.0481},
 "palette_from": ["ocean", "deep ocean", "shallow sea"],
 "era": {"name": "Last ice age", "what": "An ice cap over the islands and their shelf", "arrives_years_before_2026": [30100, 30000], "leaves_years_before_2026": [20076, 10176], "account": "The past. The last ice age: the South Shetland Islands lay under an ice cap of their own, grounded across their shelf about 50 kilometres north of today’s coast and south to the edge of the deep Bransfield Basin, where floating ice took over. About half of today’s open sea on the plate lay under ice. The ice was probably already there when the timeline begins; it melted back from roughly 20,076 years ago until about 10,176, when the last floating ice in Maxwell Bay and the Bransfield Basin gave way to open water. The lines that stand for the open sea turn the colour of ice, all at once, and only across those spans.", "source": "Ó Cofaigh et al. 2014, Quaternary Science Reviews 100:87; Bentley et al. 2014, Quaternary Science Reviews 100:1; Lavoie et al. 2015, The Cryosphere 9:613; Milliken et al. 2009, GSA Bulletin 121:1711"},
 "history": [{"years_ago": 3300000, "range_years_ago": [3500000, 3100000], "what": "The ocean ridge feeding the old plate that sinks beneath this plate stopped spreading.", "source": "Livermore et al. 2000, Geology 28:607, doi:10.1130/0091-7613(2000)28<607:AOADSC>2.0.CO;2"}],
 "outline_lon_lat": [[[-56.27, -60.74], [-56.92, -60.56], [-57.49, -60.85], [-58.13, -60.96], [-58.89, -61.08], [-59.84, -61.18], [-60.65, -61.36], [-61.33, -61.54], [-62.2, -61.84], [-63.11, -62.11], [-63.97, -62.42], [-63.29, -62.82], [-62.42, -63.0], [-61.75, -63.29], [-60.12, -62.95], [-58.61, -62.55], [-57.39, -62.3], [-56.31, -62.06], [-55.44, -61.69], [-54.3, -61.51], [-54.31, -60.98], [-55.07, -60.76], [-55.81, -60.7], [-56.27, -60.74]]],
 "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"
}