b'Metadata standard for MTTechnical notecalibration data and a plain ASCII file containing the related metadata in XML format. Related utilities are in C, C and FORTRAN, with interface functions in Matlab and Powershell.As part of its PASSCAL program, the IRIS option provides a Commonwealth of Australia (Geoscience Australia) 2021.comprehensive list of metadata parameters recommendedThis product is released under the Creative Commons for implementation using the JSON file format (Peacock andAttribution 4.0 International Licence.Frassetto, 2020). These metadata may be written as headers to binary data files of varying formats.IRIS has also commissioned work to develop MTH5 (Peacock,References2018), an MT-specific self-describing, modern, HDF-based time- Duan, J., and A. Kirkby. 2018. Data formats, interoperability series format, as well as additional work to develop a series ofand sharing. Presentation to EMIW Workshop, Helsingr, utilities and tools to support the format and integrate it in MTDenmark, 2018data workflows. Ip, A., A. Turner, Y. Poudjom Djomani, R.C. Brodie, P. Wynne, K. IRIS is working with suppliers to deliver data acquisitionDruken, N. Symington and C. Kemp. 2019. Discovering and platforms that provide time-series data in an accessible non- using geophysical data in the 21st century, ASEG Extended proprietary format. These suppliers would include thoseAbstracts, 2019:1, 1-6, DOI: 10.1080/22020586.2019.12073191supplying the Australia market. Kelbert, A., S. Erofeeva, C. Trabant, R. Karstens, and M. Van Fossen. 2018. Taking magnetotelluric data out of the drawer, Due to the compatibility of the standard recommendedEos, 99, DOI: 10.1029/2018EO112859herein for field-acquired metadata with the IRIS-developedKirkby, A. 2019. Developing metadata standards for time standard for published metadata, and its compatibilityseries magnetotelluric data, Preview, 2019:199, 4953, DOI: with the IRIS-developed time-series format, Geoscience10.1080/14432471.2019.1600210Australia recommends the adoption by the AustralianKrischer, L., J. Smith, W. Lei, M. Lefebvre, Y. Ruan, E. Sales de MT community of the metadata standard in Peacock andAndrade, N. Podhorszki, E. Bozda, and J. Tromp. 2016. Frassetto (2020) and time-series format in Peacock (2018)An Adaptable Seismic Data Format, Geophysical Journal for the delivery of publicly accessible time-series data. InInternational, 207(2), DOI: 10.1093/gji/ggw319making this recommendation, we recognise there are risksLeonard, T., D. Fitzgerald, and J. Keetley. 2020. Magnetotelluric associated with itfor example, there is no guaranteetime series metadata consultation and recommendations, that the IRIS standards will be internationally embraced,Intrepid Geophysics, http://pid.geoscience.gov.au/dataset/a different international standard may be adopted downga/145467the track, and there will be challenges implementing thisPeacock, J. 2018. MTH5: a hierarchical format for magnetotelluric standard in existing workflows. Also, the IRIS Workingdata, USGS, https://mth5.readthedocs.io/en/latest/Group for Magnetotelluric Data Handling and SoftwarePeacock, J., and A. Frassetto. 2020. A standard for exchangeable (https://www.iris.edu/hq/about_iris/governance/mt_soft)magnetotelluric metadata, IRIS Working Group for Data plans to deliver an MT data processing and analysisHandling and SoftwarePASSCAL Magnetotelluric Program, workflow by the end of September 2021, which may havehttps://mth5.readthedocs.io/en/latest/source/mt_metadata_implications for these recommendations. Nevertheless,guide.htmlwe are of the view that it is preferable to make aRees, N., B. Evans, G. Heinson, D. Conway, R. Yang, S. Thiel, K. recommendation now so that high-performance AustralianRobertson, K. Druken, B. Goleby, J. Wang, L. Wyborn, and MT data is available to the research community, even if thisH. Seill. 2019. The Geosciences DeVL Experiment: new recommendation may need to be revisited in light of futureinformation generated from old magnetotelluric data of international developments. The University of Adelaide on the NCI High Performance Computing Platform, ASEG Extended Abstracts, 2019:1, 1-6, DOI: 10.1080/22020586.2019.12073015Acknowledgements Ritter, O., R. Klose, and U. Weckmann. 2015. EMERALD data Geoscience Australia thanks the Australian MT community forformat for magnetotelluric data, Scientific Technical Report contributing the advice, insights and suggestions that have15/08Data, Potsdam: Deutsches GeoForschungsZentrum underpinned the development of this metadata standard, andGFZ, 50 p., DOI: 10.2312/GFZ.b103-15082Intrepid Geophysics for the preparation of its reports. Wight, D.E. 1988, SEG standard For MT and EMAP data: 58th Annual International Meeting, SEG, Expanded Abstracts, The authors are grateful to D. Lescinsky, Y. Poudjom Djomani249251, DOI: 10.1190/1.1892244and N. Brown for reviewing this paper and improving it withWilkinson, M.D. etal. 2016. The FAIR guiding principles for their feedback. scientific data management and stewardship, Scientific Data, 3:160018, DOI: 10.1038/sdata.2016.18This paper is published with the permission of the CEO,Wyborn, L. etal. 2020. GeoDeVL Project Final Report, Zenodo. Geoscience Australia. https://doi.org/10.5281/zenodo.427899763 PREVIEW DECEMBER 2021'