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Estimation of seismic quality factor Q for Victoria, Australia

Created 17/10/2025

Updated 17/10/2025

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The effective quality factor Q for S wave attenuation in the Victorian lithosphere has been calculated using both the spectral ratio and coda Q methods. The frequency range studied was 2-20 Hz, and Q was found to be frequency dependent. A simple model has been adopted, with a low Q in the top 4 km of the crust that varies from 20 at a frequency of 1 Hz to 60 at 10 Hz. The lower crust has a higher Q that varies from 100 at 1 Hz to 700 at 10 Hz. Empirical formulae for Q determined by linear regression of logarithmic plots of amplitude versus frequency are Q = 20f 0.5 for the 4 km thick upper crust, and Q = 100f 0.85 for the lower crust, where f is frequency.

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Field Value
Title Estimation of seismic quality factor Q for Victoria, Australia
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/en/dataset/75e84b44-97b1-45cd-919c-f419f7cacf75
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        140.5,
        -40.0
      ],
      [
        150.0,
        -40.0
      ],
      [
        150.0,
        -34.0
      ],
      [
        140.5,
        -34.0
      ],
      [
        140.5,
        -40.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Estimation of seismic quality factor Q for Victoria, Australia". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/estimation-of-seismic-quality-factor-q-for-victoria-australia