[{"awards": "1929991 Pettit, Erin C", "bounds_geometry": ["POLYGON((-105.82 -74.85,-105.78899999999999 -74.85,-105.758 -74.85,-105.727 -74.85,-105.696 -74.85,-105.66499999999999 -74.85,-105.634 -74.85,-105.60300000000001 -74.85,-105.572 -74.85,-105.541 -74.85,-105.51 -74.85,-105.51 -74.868,-105.51 -74.886,-105.51 -74.904,-105.51 -74.922,-105.51 -74.94,-105.51 -74.958,-105.51 -74.976,-105.51 -74.994,-105.51 -75.012,-105.51 -75.03,-105.541 -75.03,-105.572 -75.03,-105.60300000000001 -75.03,-105.634 -75.03,-105.66499999999999 -75.03,-105.696 -75.03,-105.727 -75.03,-105.758 -75.03,-105.78899999999999 -75.03,-105.82 -75.03,-105.82 -75.012,-105.82 -74.994,-105.82 -74.976,-105.82 -74.958,-105.82 -74.94,-105.82 -74.922,-105.82 -74.904,-105.82 -74.886,-105.82 -74.868,-105.82 -74.85))"], "date_created": "Fri, 14 Aug 2026 00:00:00 GMT", "description": "This dataset includes a shapefiles of traces of a set of fractures extending from the pinning ridge on the Thwaites Eastern Ice Shelf in West Antarctica (the \"Daggers\"). Fractures were manually-digitized as line features by two independent analysts (shapefiles corresponding to \"MS\" and \"ZB\", respectively) from monthly Sentinel-1 Synthetic Aperture Radar (SAR) images between January 2016 and January 2026. \r\n\u003cbr/\u003e\r\n\u003cbr/\u003eAttribute tables for each shapefile contain fields for: \"Crevasse ID\" and \"Date\".\r\n\u003cbr/\u003eCrevasse IDs are in order from East to West (Crevasse 1-5). \r\n\u003cbr/\u003eDates refer to the date of the Sentinel-1 image from which the fracture was traced, recorded as as integers in the format \u0027yyyymmdd\u0027", "east": -105.51, "geometry": ["POINT(-105.66499999999999 -74.94)"], "keywords": "Antarctica; Basal Crevassing; Crevasses; Cryosphere; Ice Shelf; Ice Shelf Fracture; Thwaites", "locations": "Thwaites; Antarctica", "north": -74.85, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Sharp, Meghan; Pettit, Erin; Beiergrohslein, Zoee; Alley, Karen; Truffer, Martin; Muto, Atsu; Luckman, Adrian; Wild, Christian; Sauret, Genevieve", "project_titles": "NSF-NERC: Thwaites-Amundsen Regional Survey and Network (TARSAN) Integrating Atmosphere-Ice-Ocean Processes affecting the Sub-Ice-Shelf Environment", "projects": [{"proj_uid": "p0010162", "repository": "USAP-DC", "title": "NSF-NERC: Thwaites-Amundsen Regional Survey and Network (TARSAN) Integrating Atmosphere-Ice-Ocean Processes affecting the Sub-Ice-Shelf Environment"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "Thwaites (ITGC)", "south": -75.03, "title": "Fracture traces of the \"Daggers\" on Thwaites Eastern Ice Shelf (2016-2026)", "uid": "602084", "west": -105.82}, {"awards": "1841607 Banwell, Alison; 1841467 MacAyeal, Douglas", "bounds_geometry": ["POLYGON((-68.28 -71.1,-68.202 -71.1,-68.124 -71.1,-68.046 -71.1,-67.968 -71.1,-67.89 -71.1,-67.812 -71.1,-67.734 -71.1,-67.656 -71.1,-67.578 -71.1,-67.5 -71.1,-67.5 -71.14999999999999,-67.5 -71.19999999999999,-67.5 -71.25,-67.5 -71.3,-67.5 -71.35,-67.5 -71.39999999999999,-67.5 -71.44999999999999,-67.5 -71.5,-67.5 -71.55,-67.5 -71.6,-67.578 -71.6,-67.656 -71.6,-67.734 -71.6,-67.812 -71.6,-67.89 -71.6,-67.968 -71.6,-68.046 -71.6,-68.124 -71.6,-68.202 -71.6,-68.28 -71.6,-68.28 -71.55,-68.28 -71.5,-68.28 -71.44999999999999,-68.28 -71.39999999999999,-68.28 -71.35,-68.28 -71.3,-68.28 -71.25,-68.28 -71.19999999999999,-68.28 -71.14999999999999,-68.28 -71.1))"], "date_created": "Wed, 20 Mar 2024 00:00:00 GMT", "description": "This dataset contains all of the field data (GNSS, weather station data, timelapse camera images) used in the publication \u0027Banwell et al., 2024\u0027, which documents observations of surface meltwater-induced flexure and fracture at a doline on north George VI Ice Shelf, Antarctic Peninsula. ", "east": -67.5, "geometry": ["POINT(-67.89 -71.35)"], "keywords": "Antarctica; Antarctic Peninsula; AWS; Cryosphere; GNSS; GPS Data; Ice-Shelf Flexure; Ice Shelf Fracture; Ice-Shelf Melt; Timelaps Images", "locations": "Antarctica; Antarctic Peninsula", "north": -71.1, "nsf_funding_programs": "Antarctic Glaciology; Antarctic Glaciology", "persons": "Banwell, Alison; Willis, Ian; Stevens, Laura; Dell, Rebecca; MacAyeal, Douglas", "project_titles": "NSFGEO-NERC: Ice-shelf Instability Caused by Active Surface Meltwater Production, Movement, Ponding and Hydrofracture", "projects": [{"proj_uid": "p0010449", "repository": "USAP-DC", "title": "NSFGEO-NERC: Ice-shelf Instability Caused by Active Surface Meltwater Production, Movement, Ponding and Hydrofracture"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -71.6, "title": "Dataset for: Banwell et al. 2024, \u0027Observed meltwater-induced flexure and fracture at a doline on George VI Ice Shelf, Antarctica\u0027, Journal of Glaciology.", "uid": "601771", "west": -68.28}]

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Dataset Title/Abstract/Map	NSF Award(s)	Date Created	PIs / Scientists	Project Links	Abstract	Bounds Geometry	Geometry	Selected	Visible
Fracture traces of the "Daggers" on Thwaites Eastern Ice Shelf (2016-2026)	1929991	2026-08-14	Sharp, Meghan; Pettit, Erin; Beiergrohslein, Zoee; Alley, Karen; Truffer, Martin; Muto, Atsu; Luckman, Adrian; Wild, Christian; Sauret, Genevieve	NSF-NERC: Thwaites-Amundsen Regional Survey and Network (TARSAN) Integrating Atmosphere-Ice-Ocean Processes affecting the Sub-Ice-Shelf Environment	This dataset includes a shapefiles of traces of a set of fractures extending from the pinning ridge on the Thwaites Eastern Ice Shelf in West Antarctica (the "Daggers"). Fractures were manually-digitized as line features by two independent analysts (shapefiles corresponding to "MS" and "ZB", respectively) from monthly Sentinel-1 Synthetic Aperture Radar (SAR) images between January 2016 and January 2026. <br/> <br/>Attribute tables for each shapefile contain fields for: "Crevasse ID" and "Date". <br/>Crevasse IDs are in order from East to West (Crevasse 1-5). <br/>Dates refer to the date of the Sentinel-1 image from which the fracture was traced, recorded as as integers in the format 'yyyymmdd'	["POLYGON((-105.82 -74.85,-105.78899999999999 -74.85,-105.758 -74.85,-105.727 -74.85,-105.696 -74.85,-105.66499999999999 -74.85,-105.634 -74.85,-105.60300000000001 -74.85,-105.572 -74.85,-105.541 -74.85,-105.51 -74.85,-105.51 -74.868,-105.51 -74.886,-105.51 -74.904,-105.51 -74.922,-105.51 -74.94,-105.51 -74.958,-105.51 -74.976,-105.51 -74.994,-105.51 -75.012,-105.51 -75.03,-105.541 -75.03,-105.572 -75.03,-105.60300000000001 -75.03,-105.634 -75.03,-105.66499999999999 -75.03,-105.696 -75.03,-105.727 -75.03,-105.758 -75.03,-105.78899999999999 -75.03,-105.82 -75.03,-105.82 -75.012,-105.82 -74.994,-105.82 -74.976,-105.82 -74.958,-105.82 -74.94,-105.82 -74.922,-105.82 -74.904,-105.82 -74.886,-105.82 -74.868,-105.82 -74.85))"]	["POINT(-105.66499999999999 -74.94)"]	false	false
Dataset for: Banwell et al. 2024, 'Observed meltwater-induced flexure and fracture at a doline on George VI Ice Shelf, Antarctica', Journal of Glaciology.	1841607 1841467	2024-03-20	Banwell, Alison; Willis, Ian; Stevens, Laura; Dell, Rebecca; MacAyeal, Douglas	NSFGEO-NERC: Ice-shelf Instability Caused by Active Surface Meltwater Production, Movement, Ponding and Hydrofracture	This dataset contains all of the field data (GNSS, weather station data, timelapse camera images) used in the publication 'Banwell et al., 2024', which documents observations of surface meltwater-induced flexure and fracture at a doline on north George VI Ice Shelf, Antarctic Peninsula.	["POLYGON((-68.28 -71.1,-68.202 -71.1,-68.124 -71.1,-68.046 -71.1,-67.968 -71.1,-67.89 -71.1,-67.812 -71.1,-67.734 -71.1,-67.656 -71.1,-67.578 -71.1,-67.5 -71.1,-67.5 -71.14999999999999,-67.5 -71.19999999999999,-67.5 -71.25,-67.5 -71.3,-67.5 -71.35,-67.5 -71.39999999999999,-67.5 -71.44999999999999,-67.5 -71.5,-67.5 -71.55,-67.5 -71.6,-67.578 -71.6,-67.656 -71.6,-67.734 -71.6,-67.812 -71.6,-67.89 -71.6,-67.968 -71.6,-68.046 -71.6,-68.124 -71.6,-68.202 -71.6,-68.28 -71.6,-68.28 -71.55,-68.28 -71.5,-68.28 -71.44999999999999,-68.28 -71.39999999999999,-68.28 -71.35,-68.28 -71.3,-68.28 -71.25,-68.28 -71.19999999999999,-68.28 -71.14999999999999,-68.28 -71.1))"]	["POINT(-67.89 -71.35)"]	false	false

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U.S. ANTARCTIC PROGRAM DATA CENTER

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