{ "schema": "ausmt-station", "version": "0.1", "ausmt_id": "au.black-hill-2005-06.BH26-02", "station": "BH26-02", "survey": "Black Hill 2005-06", "survey_id": "black-hill-2005-06", "country": "Australia", "organisation": "Geological Survey of South Australia", "location": { "lat": -34.669456, "lon": 139.439181 }, "data": { "type": "BBMT", "n_periods": 30, "period_min_s": 0.004194, "period_max_s": 75.0375 }, "diagnostics": { "median_relative_error": 0.115, "remote_reference": true, "tipper_available": true, "completeness_smoothness_diagnostic": { "value": 3.4, "basis": "e", "note": "not a quality or geological-value judgement" }, "classification": "indeterminate", "method": "phase-tensor (Caldwell 2004)", "note": "screening diagnostic, not an interpretation product" }, "processing": { "software": "blackhill.recover", "algorithm": null, "remote_reference": true, "remote_site": null, "file_written_by": { "name": "blackhill.recover", "version": "1.0.0" }, "note": "ausmt.station.id=BH26-02\nderivation.class=figure-recovered\nderivation.class_note=the transfer function in this file was read off a printed sounding figure in the survey reports, because no data file for this station survives in any custodian system. It is not a custodian data file and no instrumental record of this station is held. It carries the off diagonal impedance and the tipper only: the diagonal was never plotted and is absent at every frequency, and no page draws a tipper error bar, so TXVAR.EXP and TYVAR.EXP are absent too. An absent value is written as the literal nan, which is not a token the SEG EDI standard defines. Every station of this survey declares derivation.class and its value is one of exactly two. The other value, contractor-processed, marks a station the custodian delivered as the contractor's own output, carrying a complete tensor.\nausmt.station.line=26\nausmt.station.site=02\nausmt.station.n_periods=30\nausmt.station.latitude_deg=-34.669455\nausmt.station.longitude_deg=139.439181\nausmt.station.easting_m=356996\nausmt.station.northing_m=6162504\nausmt.station.grid=EPSG:28354\nausmt.station.position_source=report coverage table, Tables VII to X, MT Sites Coverage for lines 12, 16, 25 and 26, page 215 of blackhill-el3122-annual-reports-env11133-mesac25554.pdf\nausmt.station.position_note=The coverage table's UTM columns are authoritative and the latitude and longitude above are computed from them through EPSG:28354. The table's own printed degree columns are not used.\nausmt.station.acquisition_date=not stated per station in either report, so no ACQDATE is written rather than a campaign date standing in for one\nderivation.kind=recovered from a published figure. This file is not a custodian data file and no instrumental record of this station is held.\nderivation.tool=blackhill.recover\nderivation.tool_version=1.0.0\nderivation.method=the plotted points are read from the PDF's own vector drawing operators. No raster image and no character recognition is involved. Each panel's axes are calibrated by a straight line fit through the tick MARKS the page draws, each carrying the value of the numeric label beside it. The label's own text box centre is not the mark and stands off it the same way on every page, so fitting to the labels instead would carry that offset into every value read through the axis. The fit residual measured on this page is stated below.\nderivation.source_report=Appendix 3, Logistics report for MT Survey November 2005 to February 2006, QCI Project QCL-414, Quantech Consulting Inc., within the EL3122 Black Hill Annual Technical Report to 26 August 2006.\nderivation.source_delivery=11133.pdf, the South Australia open file envelope 11133 scan, 429 pages as retrieved 2026\nderivation.source_document=EL 3122 Black Hill annual technical report, period ending 26 August 2006, Falcon Minerals Limited. South Australia open file envelope 11133. The identifier names the envelope, which compiles several annual reports; the magnetotelluric logistics report inside it has no identifier of its own.\nderivation.source_document_pid=https://pid.sarig.sa.gov.au/document/mesac25554\nfigure.appendix=Appendix B, Sounding Curves\nfigure.appendix_page=B109\nfigure.pdf_file=blackhill-el3122-annual-reports-env11133-mesac25554.pdf\nfigure.pdf_page=334\nfigure.panel_label=LINE 26 - SITE 02\nfigure.panels=apparent resistivity RhoXY and RhoYX, phase PhsXY and PhsYX, tipper Txr and Txi, tipper Tyr and Tyi\nfigure.axis_fit_residual_decades=0.00263\nfigure.axis_fit_residual_rho_decades=0.00299\nfigure.axis_fit_residual_phase_deg=0.09677\nfigure.frequency_panel_spread_decades=0.00556\nfigure.frequency_note=each frequency is read from the logarithmic frequency axis and is the mean of the four panels' readings of it. It is not snapped to any nominal frequency list. The spread above is the widest disagreement between the four panels on this page.\ncomponents.served=ZXY, ZYX, TX, TY\ncomponents.diagonal=ABSENT, not zero. The report figures plot the off diagonal responses only, so Zxx and Zyy were never published for this station, and none may be inferred from this file. The diagonal blocks are written and every value in them is the absence marker described under absence.marker below. A phase tensor, a dimensionality call and a skew all need the diagonal and are therefore undetermined for this station.\ncomponents.reconstruction=each off diagonal impedance is rebuilt from the plotted apparent resistivity and phase as Z = sqrt(5 f rho) exp(i phi), with Z in mV/km/nT, rho in ohm m and f in Hz. The tipper is plotted in full and is read directly with no reconstruction.\ncomponents.absent_points=a frequency at which the figure draws no marker for a series carries the absence marker for that series, which is a value the figure could not plot because it falls outside the panel's axes. An impedance needs both its apparent resistivity and its phase, so a frequency carrying one without the other carries no impedance either. On this page 0 such frequencies were read.\nrotation.applied_deg=-90.0\nrotation.convention=x north y east, Z_std = R Z R^T with theta = minus the declared frame. The figures are drawn in the contractor's acquisition frame, which the report states is unrotated, and the delivered files of this survey are rotated by -90 degrees into x north y east. This file is written in that same published frame so the survey declares one frame at every station.\nrotation.exactness=at a multiple of ninety degrees the off diagonal block of the impedance maps into itself, Z_xy becomes minus Z_yx and Z_yx becomes minus Z_xy, so the rotation needs no diagonal and is exact. At any other angle it would need the diagonal and could not be done at all.\nrotation.verification=NOT confirmed inside this report. It plots only lines 12, 16, 25 and 26, and the custodian delivered none of those, so no station here has a file to be checked against. Two measured facts carry the frame across from the other half of the same logistics report, where 219 stations do confirm it. First, both reports print the same example sounding figure, SURVEY_SPECS.pdf page 21 and this report page 217: identical panel sizes, identical marker counts, identical colours and marker positions agreeing to one part in a hundred thousand of the panel width, so one plotting program with one setting drew both. Second, each page's own legend swatches are read on that page, so the binding of colour to series is verified here directly and is not carried over. What is carried over is the frame itself, which rests on the report's own statement that the tensor output is unrotated.\nuncertainty.basis=the contractor's stated data accuracy for this survey, apparent resistivity better than one twentieth of a decade and phase better than three degrees, which under the single impedance error convention are the same statement and agree to within a tenth\nuncertainty.relative_impedance_error=0.0576\nuncertainty.scope=survey wide and not a per point estimate. ZXY.VAR and ZYX.VAR are the square of this relative error times the impedance magnitude at each frequency.\nuncertainty.error_bars_read=the figure draws an error bar at every resistivity and phase point. The bars were read and are quantised to the page's drawing grid: on this page they imply a median relative impedance error of 0.0072, against the stated accuracy of 0.0576, and 1 of 58 drawn bars exceed it. A bar larger than the stated accuracy raises the variance written here; a smaller one does not lower it.\nuncertainty.tipper=ABSENT. No tipper error bar is drawn on any page of either report, so nothing measures a tipper uncertainty. TXVAR.EXP and TYVAR.EXP are written and every value in them is the absence marker. A zero there would be a fabrication.\nabsence.marker=nan\nabsence.reason=an absent value in a data block of this file is written as the literal nan and never as a number. The format's own absence marker is the EMPTY value declared in the head, and it does not survive being read: the common reader of this format, mt_metadata, maps EMPTY to 0.0 while parsing, so a value written the standard way is a measured zero by the time anything stores it. Leaving a block out says the same thing, because the reader fills the array it did not find with zeros. nan survives the parse, stores as nan, and reopens as nan from an MTH5.\nabsence.cost=nan is not a token the SEG EDI standard defines, so this file is not strictly conforming and a strict third party reader may reject it or mishandle the value. A reader that cannot take nan must treat every nan here as no data and must never read it as zero. The head still declares EMPTY because the format asks for the declaration, and no value in this file equals it.\nabsence.diagonal=ZXXR, ZXXI, ZXX.VAR, ZYYR, ZYYI and ZYY.VAR are written at every frequency and all 180 of their values are absent. The diagonal cannot be reconstructed from what the figures plot and no zero stands in for it.\nabsence.tipper_variance=TXVAR.EXP and TYVAR.EXP are written at every frequency and all 60 of their values are absent. Nothing on any page measures a tipper uncertainty.\nabsence.unplotted_points=0 further values are absent because the figure carries the frequency and draws no marker there.\nabsence.values_written=240\nausmt.survey.name=Black Hill\nausmt.survey.project_code=QCL-414\nausmt.survey.client=INCO RESOURCES (AUSTRALIA) PTY LTD\nausmt.survey.contractor=Quantech Consulting Inc.\nausmt.survey.report=MT Geophysical Survey Logistics Report\nausmt.survey.council=Regional Council of Goyder and Mid Murray Council\nausmt.survey.technique=Tensor soundings, remote-referenced\nausmt.survey.station_configuration=\"L\" shaped E-field array; Ex, East, Ey - North; 3 Low Frequencies coils Hx, Hy, Hz\nausmt.survey.dipole_length_m=100.0\nausmt.survey.frequency_bandwidth_hz=0.001 to 250 Hz; Operating: 0.001 to 1000 Hz Effective: 1000s to 400 Hz\nausmt.survey.receiver_system=Quantec RT-130 Data Logger, comprising: - 6 channels max. per system (5 channels operationally) with internal A/D conversion (24bit @120db, and buffer memory (6Mb). - 2 Recording Units (loggers), deployed simultaneously for recording site and remote reference - 2 GPS synchronization clocks (10nsec precision /12.3MHz clock-speed)\nausmt.survey.receiver_coils=6 EMI model BF-4/BF-7/ BF-21 (10000sec to 1000Hz) Magnetometers (Hx-Hy-Hz), 3 at each site\nausmt.survey.receiver_electrodes=Ground contacts using steel plates\nausmt.survey.time_series_sampling=1000 samples/sec\nausmt.survey.sample_record_time=1 to 8 events @ 2 hrs. per event (total recording time approx. 2 to 14 hours)\nausmt.survey.post_processing_software=QGL QuickLay 2.25.28 version\nausmt.survey.edi_software=Geotools\nausmt.survey.data_presentation=- Maps: Sounding Curves: MT Apparent Resistivity and Phase (XY and YX), Tipper Transfer Function (XrXi & YrYi) (See Appendix B). Pseudosection Plots: MT Apparent Resistivity and Phase Pseudosections (XY, and YX), posted, contoured (equal area zoning) and plotted, in ground units (See Appendix C). - Digital: Raw data: Base and Remote Raw data, qtpi directory (i.e. qtpi - 231005-BhL05_0001 - 231005-BhL05_0001.net that contains information on the location and time of the event). Archived onto data DVD's daily. Processed data: MT DATA, in .EDI (electronic data interchange) file, created in GeotoolsTM containing tensor sounding data (XY & YX), for individual stations (sites) and profiles (site-sets), in a format conforming to SEG standard for the storage MT data.\nausmt.survey.remote_reference_site.1=Site 00 345177E; 6198138N (see Figure 3)\nausmt.survey.remote_reference_site.2=Site 0A 372693E; 6251054N (see Figure 2)\nausmt.survey.remote_reference_site.3=Site 03 342756E; 6198246N (see Figure 3)\nausmt.survey.campaign.1=2005-10-19 to 2005-12-14, 60 days elapsed, 50 days read time\nausmt.survey.campaign.2=2006-01-17 to 2006-02-15, 32 days elapsed, 29 days read time\nausmt.survey.personnel.data_processing_office=Susanna Scappin, Julia Milne\nausmt.survey.personnel.field_technicians=Trent Retallick, Sandy Tonner, Michael Klimpton, Ben Clare, Dave Richardson, Damon Gilbert, Dave Clinton, Matteo Rizzi\nausmt.survey.personnel.geophysicists_interpreters=Bill Doerner\nausmt.survey.personnel.project_manager=Bill Doerner" }, "distribution": { "edi_available": true, "license": "CC-BY-4.0", "edi_path": "edi/black-hill-2005-06/BH26-02.edi" }, "provenance": { "pipeline": "ausmt/extract.build_portal", "pipeline_version": "0.2.1", "extractor": "mt_metadata (community canonical)", "software": { "python": "3.12.14", "mt_metadata": "1.0.10", "mth5": "0.6.8" }, "git_commit": "7df0aa799037de85121d3e96e467172abe865b3e", "parameters": { "dimensionality": { "beta_per_period_deg": 3.0, "skew_3d_deg": 5.0, "pct_periods_3d_threshold": 40, "ellip_2d_deg": 0.1, "min_rez_row_sine": 0.01, "beta_physical_cap_deg": 15.0, "min_usable_period_frac": 0.5, "skew_aggregation": "median" }, "diagnostic": "completeness/smoothness (median rel error + coverage + smoothness)" }, "generated": "2026-09-11T23:45:27.655986+00:00", "input_file": "BH26-02.edi", "input_sha256": "73b5045e019cb566f10e398f04b5bb57aae213f4a3406d7b4952eb1c18d5bfaf" }, "coordinate_qc": null, "canonical_conditioning": null, "frame": { "evidence": { "branch": "mt", "zrot": "0", "trot": "0", "rotspec": null, "hmeas_azimuths": { "hx": 0.0, "hy": 90.0 }, "emeas_azimuths": { "ex": 0.0, "ey": 90.0 } }, "impedance_rotation_deg_source": null, "tipper_rotation_deg_source": null, "derotated": false, "frame_served": "declared-zero", "declared_azimuth_deg": 0.0, "convention_check": { "verdict": "ok", "phs_xy_median_deg": 35.0, "phs_yx_median_deg": -147.62, "n_periods_used": 30, "detail": null } }, "resources": [ { "id": "edi", "kind": "transfer_function", "format": "edi", "provenance_role": "source", "representation_role": "original", "path": "edi/black-hill-2005-06/BH26-02.edi" }, { "id": "mth5", "kind": "transfer_function", "format": "mth5", "provenance_role": "derived", "representation_role": "alternate", "path": "h5/black-hill-2005-06/BH26-02.h5" }, { "id": "edi-zip", "kind": "archive", "format": "zip", "path": "bundles/black-hill-2005-06-edi.zip" }, { "id": "survey-mth5", "kind": "archive", "format": "mth5", "path": "bundles/black-hill-2005-06-tf.h5" } ] }