<div>The Abbot Point to Hydrographers Passage bathymetry survey was acquired for the Australian Hydrographic Office (AHO) onboard the RV Escape during the period 6 Oct 2020 – 16 Mar 2021. This was a contracted survey conducted for the Australian Hydrographic Office by iXblue Pty Ltd as part of the Hydroscheme Industry Partnership Program. The survey area encompases a section of Two-Way Route from Abbot Point through Hydrographers Passage QLD. Bathymetry data was acquired using a Kongsberg EM 2040, and processed using QPS QINSy. The dataset was then exported as a 30m resolution, 32 bit floating point GeoTIFF grid of the survey area.</div><div>This dataset is not to be used for navigational purposes.</div>

This data set provides outlines for the maximum spatial extent of seabed geomorphic units for Australia's Exclusive Economic Zone, including the offshore island territories, but excluding Australian Antarctic Territory. Twenty-one geomorphic feature types were identified and mapped, following definitions published by the International Hydrographic Office (IHO, 2001). <b>Value: </b>The geomorphology of the seabed is used to constrained surface geology of the sea floor, important in resource exploration, marine zone management and for understanding the physical environment <b>Scope: </b>The area covered includes the seafloor within the Australian marine jurisdiction surrounding the Australian mainland and island territories of Christmas, Cocos (Keeling), Macquarie, and Norfolk Islands (Heap & Harris 2008).

In November, 2018 a workshop of experts sponsored by UNESCO’s Intergovernmental Oceanographic Commission was convened in Wellington, New Zealand. The meeting was organized by Working Group (WG) 1 of the Pacific Tsunami Warning System (PTWS). The meeting brought together fourteen experts from various disciplines and four different countries (New Zealand, Australia, USA and French Polynesia) and four observers from Pacific Island countries (Tonga, Fiji), with the objective of understanding the tsunami hazard posed by the Tonga-Kermadec trench, evaluating the current state of seismic and tsunami instrumentation in the region and assessing the level of readiness of at-risk populations. The meeting took place in the “Beehive” Annex to New Zealand’s Parliament building nearby the offices of the Ministry of Civil Defence and Emergency Management. The meeting was co-chaired by Mrs. Sarah-Jayne McCurrach (New Zealand) from the Ministry of Civil Defence and Emergency Management and Dr. Diego Arcas (USA) from NOAA’s Pacific Marine Environmental Laboratory. As one of the meeting objectives, the experts used their state-of-the-science knowledge of local tectonics to identify some of the potential, worst-case seismic scenarios for the Tonga-Kermadec trench. These scenarios were ranked as low, medium and high probability events by the same experts. While other non-seismic tsunamigenic scenarios were acknowledged, the level of uncertainty in the region, associated with the lack of instrumentation prevented the experts from identifying worse case scenarios for non-seismic sources. The present report synthesizes some of the findings of, and presents the seismic sources identified by the experts to pose the largest tsunami risk to nearby coastlines. In addition, workshop participants discussed existing gaps in scientific knowledge of local tectonics, including seismic and tsunami instrumentation of the trench and current level of tsunami readiness for at-risk populations, including real-time tsunami warnings. The results and conclusions of the meeting are presented in this report and some recommendations are summarized in the final section.

<div>The Hobart Reference Surfaces bathymetry survey was acquired for the Australian Hydrographic Office (AHO) on 10 Oct to 8 Nov 2021. This surface was created from a contracted national reference survey in Hobart TAS, collected for the purpose of calibrating multibeam echosounders.&nbsp;It was conducted for the Australian Hydrographic Office as part of the Hydroscheme Industry Partnership Program, acquired using Kongsberg EM2040D, and processed using QPS Qimera. Separate grids in 0.5m and 1m resolutions are provided for the two surveyed sites within this survey area in MSL, LAT and Ellipsoid vertical datum. The dataset was then exported as 0.5m and 1m resolutions, 32 bit floating point GeoTIFF grid of the survey area.</div><div>This dataset is not to be used for navigational purposes.</div>

<div>The Zeehan and Franklin Marine Parks, West Coast Tasmania&nbsp;Bathymetry Acquisition was acquired by CSIRO onboard the TV Bluefin between 22 Feb 2022 and 21 Mar 2022, using a Kongsberg EM2040C. This was a contracted survey conducted for the Institute for Marine and Antarctic Studies (IMAS), University of Tasmania, to conduct a multibeam survey encompasing the Zeehan and Franklin Marine Parks for Parks Australia. Bathymetry data was processed using QPS Qimera and Caris Hips & Sips processing software. The dataset was then exported as a 2m resolution, 32 bit floating point GeoTIFF grid of the survey area. A detailed report on the survey is provided in: Hydrographic Survey of Zeehan and Franklin Marine Parks, West Coast Tasmania (https://figshare.utas.edu.au/articles/report/Hydrographic_Survey_of_Zeehan_and_Franklin_Marine_Parks_West_Coast_Tasmania/23171318).</div><div>This dataset is not to be used for navigational purposes.</div>

<div>The Hay Point to Hydrographers Passage Bathymetry survey was acquired for the Australian Hydrographic Office (AHO) onboard the MV Sea Ranger and MV Brynda during the period 13 August- 09 November 2022. This is a contracted survey conducted for the Australian Hydrographic Office by EGS as part of the Hydroscheme Industry Partnership Program (HIPP). </div><div>The survey area encompases Hay Point to Hydrographers Passage in Queensland. Bathymetry data was acquired using a Kongsberg EM2040D and Kongsberg EM 2040C systems and processed using QPS Qimera processing software. The dataset was then exported as a 30m resolution, 32 bit floating point GeoTIFF grid of the survey area.</div><div>This dataset is not to be used for navigational purposes.</div>

<div>The Van Diemen Gulf (North-West Inshore Route) bathymetry survey was acquired for the Australian Hydrographic Office (AHO) onboard the MV Offshore Guardian and the MV Speical Order during the period 26 Jun 2021 – 5 Oct 2021. This was a contracted survey conducted for the Australian Hydrographic Office by Guardian Geomatics as part of the Hydroscheme Industry Partnership Program. The survey area encompases an area in Van Diemen Gulf (North-West Inshore Route), NT. Bathymetry data was acquired using a Kongsberg EM2040-07 MKII, and processed using CARIS HIPS and SIPS processing software. The dataset was then exported as a 30m resolution, 32 bit floating point GeoTIFF grid of the survey area.</div><div>This dataset is not to be used for navigational purposes.</div>

<div>The Cape Leeuwin bathymetry survey was acquired for the Australian Hydrographic Office (AHO) onboard the MV Mermaid Searcher during the period 5 Dec 2022 – 4 Apr 2023. This was a contracted survey conducted for the Australian Hydrographic Office by MMA Offshore as part of the Hydroscheme Industry Partnership Program. The survey area encompases an area in Cape Leeuwin, WA. Bathymetry data was acquired using a Kongsberg EM2040P, and processed using CARIS HIPS and SIPS processing software. The dataset was then exported as a 30m resolution, 32 bit floating point GeoTIFF grid of the survey area.</div><div>This dataset is not to be used for navigational purposes.</div>

<div>The Furneaux Group, Bass Strait&nbsp;bathymetry survey was acquired for the Australian Hydrographic Office (AHO) using Cessna 441 during the period 11 Apr 2022 – 20 Nov 2022. This was a contracted survey conducted for the Australian Hydrographic Office by Fugro Australia as part of the Hydroscheme Industry Partnership Program. The survey area encompases an area in Furneaux Group, Bass Strait. Bathymetry data was acquired using a LADS HD+ / LADS HD / RIEGL VQ-820-G, and processed using RIEGL RiProcess and CARIS HIPS and SIPS processing software. The dataset was then exported as a 30m resolution, 32 bit floating point GeoTIFF grid of the survey area.</div><div>This dataset is not to be used for navigational purposes.</div>

<div>The Torres Strait Reference Surfaces bathymetry survey was acquired for the Australian Hydrographic Office (AHO) on 12 Dec 2021. This surface was created from a contracted national reference survey between Goods Island and Goods Island cardinal mark, and Tuesday Island and the Herald Patches QLD, collected for the purpose of calibrating multibeam echosounders.&nbsp;It was conducted for the Australian Hydrographic Office as part of the Hydroscheme Industry Partnership Program, acquired using Kongsberg EM2040D, and processed using QPS Qimera. Seperate grids in 0.5m resolution are provided for the two surveyed sites within this survey area in MSL, LAT and Ellipsoid vertical datum. The dataset was then exported as a 0.5m resolution, 32 bit floating point GeoTIFF grid of the survey area.</div><div>This dataset is not to be used for navigational purposes.</div>