Site Characterization for ANSN Stations Using the Ellipticity Curve Inversion of Microtremor data

<div>The site-specific shear velocity profile for the top 30 m, VS30, is the most popular geotechnical parameter to characterize local site conditions. Shear velocity measurements are not available for the majority of earthquake-recording stations in the Australian National Seismograph Network (ANSN). Accordingly, the lack of available shear-wave velocity data in Australia makes it difficult to benchmark amplification effects to a reference site condition. One inexpensive and relatively efficient method that can be used to analyse single-station ambient noise data is the Horizontal to Vertical Spectral Ratio (HVSR) method. We used OpenHVSR software for the inversion of the HVSR curves. The S-wave velocity structure and VS30 results derived from the inversion process of the HVSR curves are in a good agreement with the previous Spatial Autocorrelation (SPAC) study for the ANSN stations and can be used as a fast and inexpensive technique to measure the VS30 for site classification purposes.&nbsp;</div><div><br></div>This Abstract was submitted/presented to the 2022 Australian Earthquake Engineering Society (AEES) Conference 24-25 November (https://aees.org.au/aees-conference-2022/)