Australian sedimentary thickness from passive seismic methods  


Authors / CoAuthors

Marignier, A. | Eakin, C. M. | Hejrani, B. | Agrawal, S. | 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>Australia's crust is blanketed by sedimentary cover. Knowledge of the distribution and thickness of sediments is crucial for assessing resource potential. Excellent constraints on sedimentary thickness can be obtained from borehole drilling or active seismic surveys, but these are expensive and often impractical in much of inland Australia. Recently, a relatively simple and low-cost method for estimating the sedimentary thickness using passive seismic data was developed and applied to seismic stations in South Australia. First-order estimates of the thickness of sediments are predicted from the delay time of the Ps converted phase generated at the sediment-basement interface via an empirical relationship constructed using borehole stratigraphy data. Here we expand the analysis to over 1500 seismic stations across Australia, covering numerous sedimentary basins that span the entire range of sedimentary basin ages from Precambrian to present-day. The new results clearly match the broad pattern of expected sedimentation based on the various Australian geological provinces. Using a new compilation of borehole data, we obtain a new, continent-wide empirical relationship from passive seismic delay to sediment cover thickness, offering a fast, simple and cheap way to characterise sediment thickness in under-explored areas. We apply the new relationship to the Exploring for the Future AusArray 2ºx2º data. </div><div><br></div><div><strong>Citation: </strong>Marignier, A., Eakin, C.M., Hejrani, B., Agrawal, S. & Hassan, R., 2024. Australian sedimentary thickness from passive seismic methods. In: Czarnota, K. (ed.) Exploring for the Future: Extended Abstracts. Geoscience Australia, Canberra. https://doi.org/10.26186/149319</div>

Product Type

document

eCat Id

149319

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/10.26186/149319

Keywords

( Project )
  • EFTF – Exploring for the Future
( Project )
  • Australia’s Resources Framework
  • sedimentary cover
  • passive seismic
  • Cover thickness
  • reciever functions
theme.ANZRC Fields of Research.rdf
  • Seismology and seismic exploration
  • Published_External

Publication Date

2025-01-12T23:02:00

Creation Date

2024-03-11T16:00:00

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 abstract publication 2024

Maintenance Information

asNeeded

Topic Category

geoscientificInformation

Series Information

Lineage

<div>This is an extended abstract for the EFTF extended abstract publication.</div>

Parent Information

Extents

[-44, -9, 112, 154]

Reference System

Spatial Resolution

Service Information

Associations

Downloads and Links

Extended Abstract for download (pdf) [2.1 MB]  

Source Information