<div>One of the key challenges in assessing earthquake hazard in Australia is understanding the attenuation of ground-motion through the stable continental crust. There are now a small number of ground-motion models (GMMs) that have been developed specifically to estimate ground-motions from Australian earthquakes. These GMMs, in addition to models developed outside Australia, are considered here for use in the updated national seismic hazard assessment of Australia. An updated and extended suite of ground-motion data from small-to-moderate Australian earthquakes are used to assess the suitability of the candidate models for use in the Australian context. Recorded spectral intensities are compared with those predicted by the GMMs. Both qualitative and quantitative approaches are considered for such comparisons. The goodness-of-fit results vary significantly among different GMMs, spectral periods and distance ranges; however, overall, the Australian-specific GMMs seem to perform reasonably well in estimating the level of ground shaking for earthquakes in Australia. This paper was presented to the 2022 Australian Earthquake Engineering Society (AEES) Conference 24-25 November (https://aees.org.au/aees-conference-2022/)

Earthquake recordings in Australia are a crucial input to a wide range of applications in seismology and earthquake engineering. In particular, earthquake recordings are critical for robust estimation of earthquake magnitudes, earthquake hazard assessment, and dynamic structural analysis. The expansion of permanent monitoring networks (e.g., Australian National Seismograph Network) and deployment of temporary seismic networks in Australia over the past few decades has resulted in a significant increase in the number of earthquake ground motion recordings, particularly for moderate magnitude events. The volume of new data means there is now a need to store these recorded data and metadata in standard format in a comprehensive, searchable, national ground motion database. Recently, we developed a ground-motion database for earthquakes in cratonic regions of western and central Australia, as well as non-cratonic southeastern Australia. We also developed an associated graphical user interface tool to process and visualise the ground-motion data. This tool can also store the processed waveforms in the database. Work is ongoing at Geoscience Australia to develop a web delivery portal to provide end-users direct access to Australian ground-motion data. This web-based portal would enable end-users to search the ground-motion database based on key earthquake, station, and waveform parameters in a user-friendly platform. Providing public access to these data will facilitate greater use of ground-motion recordings to inform various applications including seismic hazard assessment and dynamic structural analysis. Presented at the 2023 Australian Earthquake Engineering Society (AEES) Conference