{
 "schema": "ausmt-survey-metadata",
 "version": "0.1",
 "survey_id": "wa-mt-phase-1",
 "title": "WA-MT Phase 1",
 "dates": {
  "coverage": {
   "year_start": 2023,
   "year_end": 2025
  }
 },
 "abstract": "The Geological Survey of Western Australia is recording long-period magnetotelluric soundings on the WA Array grid, a 40 km lattice shared with the array's seismic sites, to image the state's lithosphere. Phase 1 serves 179 soundings from the programme's first data release, acquired between 15 December 2023 and 12 July 2025 under contract by Moombarriga Geoscience, at 1 Hz on LEMI-424 long-period systems, a logger with a three-component fluxgate, on nominal 100 m north-south and east-west dipoles with lead and lead-chloride electrodes. Stations span 114.21 to 123.32 east and 27.58 to 34.40 south. Served periods run 2.7 s to 100,000 s and every station carries a tipper. The sensors were set to magnetic north and nothing is rotated, so the frame is geomagnetic. Four exporters wrote the delivered files and their headers name four processors; take a sounding's processor from its own header. README.md carries the caveats, the header acquisition dates among them.",
 "subjects": [
  {
   "code": "370602",
   "scheme": "ANZSRC-FoR-2020",
   "label": "Electrical and electromagnetic methods in geophysics",
   "uri": "https://linked.data.gov.au/def/anzsrc-for/2020/370602"
  }
 ],
 "contributors": [
  {
   "name": "Geological Survey of Western Australia",
   "name_type": "organisation",
   "role": "ContactPerson",
   "ror": "https://ror.org/05h2dda38"
  },
  {
   "name": "M-Geo Pty Ltd trading as Moombarriga Geoscience",
   "name_type": "organisation",
   "role": "DataCollector"
  }
 ],
 "organisations": [
  {
   "name": "Geological Survey of Western Australia",
   "ror": "https://ror.org/05h2dda38",
   "roles": [
    "custodian",
    "publisher"
   ],
   "primary_custodian": true
  },
  {
   "name": "M-Geo Pty Ltd trading as Moombarriga Geoscience",
   "roles": [
    "data_collector"
   ]
  },
  {
   "name": "Adelaide University",
   "ror": "https://ror.org/028g18b61",
   "roles": [
    "hosting_institution"
   ]
  }
 ],
 "funders": [
  {
   "name": "Department of Mines, Industry Regulation and Safety",
   "ror": "https://ror.org/04mr78v45"
  }
 ],
 "rights": {
  "license": "CC-BY-4.0",
  "access": "open"
 },
 "extent": {
  "bbox": {
   "west": 114.2128,
   "south": -34.4006,
   "east": 123.3161,
   "north": -27.5828
  }
 },
 "relationships": [
  {
   "identifier": "https://www.wa.gov.au/organisation/department-of-mines-petroleum-and-exploration/geological-survey-of-western-australia/western-australias-magnetotelluric-program",
   "identifier_type": "URL",
   "relation": "IsPartOf"
  },
  {
   "identifier": "https://geodownloads.dmp.wa.gov.au/downloads/geophysics/72931/",
   "identifier_type": "URL",
   "relation": "IsPartOf"
  },
  {
   "identifier": "https://geodownloads.dmp.wa.gov.au/downloads/geophysics/72931/WAMT%20First%20Data%20Release",
   "identifier_type": "URL",
   "relation": "IsVariantFormOf"
  }
 ],
 "attribution": {
  "custodian": "Geological Survey of Western Australia",
  "custodian_ror": "https://ror.org/05h2dda38",
  "statement": "Sourced from the Geological Survey of Western Australia's WA Array long-period magnetotelluric programme, first data release, licensed CC BY 4.0 as stated by the survey's own field metadata sheet. The header dates of all 179 served copies have been repaired; the delivered files are kept unaltered under provenance/as-delivered/ and every change is recorded in the served file itself.",
  "changes_made": true,
  "changes_summary": "The served set is 179 of the 180 delivered files: the delivery carries station MBV20 twice and the rendition written by the delivery's dominant exporter is served, the other being recorded with its digest in provenance/served-files.json. No station is withheld. All 179 served files had their ACQDATE and FILEDATE values rewritten into ISO 8601 by _tools/repair_edi_header_dates.py, and a nine line record was inserted after each file's >INFO line naming the delivered file, its path in the delivery, its sha256, the kept copy, the defect, the change, that file's own exporter with the order measured over the files it wrote, and the ruling. 177 were read month first and 2, MBS24 and MBX22, day first, each on its own exporter's evidence. On 57 of the 179 the ACQDATE printed no date at all, 55 as the placeholder 01/01/01 and 2 as 1 / 1 / 4; each was set to that station's start date in the owner's field sheet, named to the tool one file at a time. No other byte of any file was changed: no data block, no other header line, no padding beyond what a changed value's width moved, and no line ending, proved file by file against provenance/as-delivered/. No number, no frame and no gate verdict is altered by the repair.",
  "declared_by": "Ben",
  "declared_date": "2026-09-19"
 },
 "provenance": {
  "generated": "2026-09-21T02:28:58Z",
  "generator": "ausmt/extract.build_portal 0.2.1"
 }
}