{
 "schema": "ausmt-survey-metadata",
 "version": "0.1",
 "survey_id": "seahorse-2022-23",
 "title": "Seahorse MT 2022-23",
 "dates": {
  "coverage": {
   "year_start": 2022,
   "year_end": 2023
  }
 },
 "abstract": "Broadband magnetotelluric soundings over BHP's Seahorse project in south-east Western Australia, where the Eucla Basin covers the boundary between the Albany-Fraser Orogen and the Madura Province. Moombarriga Geoscience recorded them for BHP with Phoenix MTU-5C and MTU-8A receivers in two campaigns: 167 soundings on four transects, Seahorse South, Roma, Hippo and Morphy, from May to July 2022, and 278 in the Hippo, Dorsal and Morphy areas, 208 of them dated December 2022 to April 2023. The 445 soundings occupy 428 sites. 430 were remote referenced and 15 are local estimates; periods run 0.0001 s to 11,651 s and 444 carry a tipper. The 2022 files are EMpower spectra and the 2023 files Geotools impedance exports. The 2022 report says sensors were laid to magnetic north; nothing is rotated. 70 of the 2023 files state no acquisition date. The 2023 site tables name 453 further sites whose data the release does not hold.",
 "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": "Moombarriga Geoscience Pty Ltd",
   "name_type": "organisation",
   "role": "DataCollector"
  },
  {
   "name": "BHP",
   "name_type": "organisation",
   "role": "Sponsor",
   "ror": "https://ror.org/04674kj97"
  },
  {
   "name": "BHP",
   "name_type": "organisation",
   "role": "RightsHolder",
   "ror": "https://ror.org/04674kj97"
  },
  {
   "name": "Geological Survey of Western Australia",
   "name_type": "organisation",
   "role": "Distributor",
   "ror": "https://ror.org/05h2dda38"
  }
 ],
 "organisations": [
  {
   "name": "Geological Survey of Western Australia",
   "ror": "https://ror.org/05h2dda38",
   "roles": [
    "custodian",
    "publisher",
    "distributor"
   ],
   "primary_custodian": true
  },
  {
   "name": "BHP",
   "ror": "https://ror.org/04674kj97",
   "roles": [
    "rights_holder"
   ]
  },
  {
   "name": "Moombarriga Geoscience Pty Ltd",
   "roles": [
    "data_collector"
   ]
  }
 ],
 "funders": [
  {
   "name": "BHP",
   "ror": "https://ror.org/04674kj97"
  }
 ],
 "rights": {
  "license": "CC-BY-4.0",
  "access": "open"
 },
 "relationships": [
  {
   "identifier": "https://magix.dmirs.wa.gov.au/api/surveylookup/getsurveybyid?surveyId=3765",
   "identifier_type": "URL",
   "relation": "IsVariantFormOf"
  },
  {
   "identifier": "https://geodownloads.dmp.wa.gov.au/downloads/geophysics/72411",
   "identifier_type": "URL",
   "relation": "IsVariantFormOf"
  }
 ],
 "attribution": {
  "custodian": "Geological Survey of Western Australia",
  "custodian_ror": "https://ror.org/05h2dda38",
  "statement": "Geological Survey of Western Australia, MAGIX registration 72411, Seahorse MT 2022-23, data owner BHP, acquired by Moombarriga Geoscience Pty Ltd. Licensed CC BY 4.0.",
  "changes_made": true,
  "changes_summary": "445 of the 550 delivered EDI files are served. The 167 of the 2022 archive are byte identical to their members. The 278 of the 2023 archive have ACQDATE and FILEDATE rewritten by _tools/repair_edi_header_dates.py: ACQDATE, which printed the placeholder 01/01/01, set to the date of the file's own first recording identifier on 208 and blanked on 70 that carry none, FILEDATE rewritten month first into ISO 8601 on all 278, and a nine line record inserted after >INFO. No other byte changed, proved file by file against provenance/as-delivered/. The 105 files of the two earlier MORPHY FINAL sets are not served and are recorded with their digests.",
  "declared_by": "Ben",
  "declared_date": "2026-09-23"
 },
 "provenance": {
  "generated": "2026-09-28T04:39:22Z",
  "generator": "ausmt/extract.build_portal 0.2.1"
 }
}