Tomographic model of the Australian region from seismic full waveform inversion  


Authors / CoAuthors

Holzschuh, J. | Gorbatov, A. | Hejrani, B. | Boehm, C. | Hassan, R. | Czarnota, K.

Abstract

<div><strong>Output Type:</strong> Exploring for the Future Extended Abstract</div><div><br></div><div><strong>Short Abstract: </strong>Knowledge of lithospheric structure is crucial information for resources exploration and deepening understanding of natural hazards. Available tomographic models of the Australian lithosphere often agree on large scale features, but in detail significant differences remain. Consequently, there is a growing need for a fully verifiable lithospheric model of Australia. Geoscience Australia has committed to develop such a model and share all results and datasets involved in model building. Here we present the first results of a full waveform inversion tomography model of Australia lithosphere down to a period of 70 s potentially able to resolve half wavelengths across continental Australia. Our model is based on seismic records from the National Seismic Network and legacy datasets with the addition of data from the currently deployed continental-scale 2° AusArray survey, which includes stations installed in previously inaccessible areas. We start with 193 earthquakes (moment magnitude (Mw) 6.2–7.5) and add 165 more earthquakes (Mw &gt;5.0) once the model progressed to a period of 70 s. Model resolution will improve over time as more data become available and more time is allowed for computation and quality control. As further iterations continue, and the inversion frequency range expands to higher frequencies, body waves can be exploited in full to constrain the model in detail and provide enough information for all components of the wavefield, building high-resolution tomographic models at a period of 40 s and below. Our model reveals previously observed first order features while revealing finer detail across much of continental Australia.</div><div><br></div><div><strong>Citation: </strong>Holzschuh, J., Gorbatov, A., Hejrani, B., Boehm, C. &amp; Hassan, R., 2024. Tomographic model of the Australian region from seismic full waveform inversion. In: Czarnota, K. (ed.) Exploring for the Future: Extended Abstracts, Geoscience Australia, Canberra, https://doi.org/10.26186/149404</div>

Product Type

document

eCat Id

149404

Contact for the resource

  Resource provider

 

  Point of contact

Commonwealth of Australia (Geoscience Australia)  
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia

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Digital Object Identifier

https://dx.doi.org/10.26186/149404

Keywords

( Project )
  • EFTF – Exploring for the Future
( Project )
  • Australia’s Resources Framework
  • Full waveform inversion
  • AusArray
  • Lithospheric structure
theme.ANZRC Fields of Research.rdf
  • Seismology and seismic exploration
  • Published_External

Publication Date

2024-08-11T22:56:49

Creation Date

2024-03-30T18:00:00

Security Constraints

Australian Government Security Classification System    

Classification - unclassified

Legal Constraints

Creative Commons Attribution 4.0 International Licence    

Use - license otherRestrictions

Status

completed

Purpose

EFTF extended abstracts

Maintenance Information

asNeeded

Topic Category

geoscientificInformation

Series Information

Lineage

<div>This is an abstract without a life cycle</div>

Parent Information

Extents

[-44.00, -9.00, 112.00, 154.00]

Reference System

Spatial Resolution

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Associations

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Extended Abstract for download (pdf) [2.1 MB]  

Download the model data (dat) [2.0 MB]  

Download data descriptor text (txt) [1.1 KB]  

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