A Passive Seismic Experiment in the Perth Basin, Western Australia
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REPORT 208 A PASSIVE SEISMIC EXPERIMENT IN THE PERTH BASIN, WESTERN AUSTRALIA by RE Murdie, H Yuan, M Dentith and X Lin CET4.pdf 1 31/05/2013 5:24:44 PM Government of Western Australia Department of Mines, Industry Regulation and Safety Government of Western Australia Department of Mines, Industry Regulation and Safety REPORT 208 A PASSIVE SEISMIC EXPERIMENT IN THE PERTH BASIN, WESTERN AUSTRALIA by RE Murdie, H Yuan1,2, M Dentith1 and X Lin3 1 Centre for Exploration Targeting, School of Earth Sciences, The University of Western Australia, Stirling Highway, Crawley WA 6009, Australia 2 Macquarie University, Balaclava Road, North Ryde NSW 2109, Australia 3 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China PERTH 2020 MINISTER FOR MINES AND PETROLEUM Hon Bill Johnston MLA DIRECTOR GENERAL, DEPARTMENT OF MINES, INDUSTRY REGULATION AND SAFETY David Smith EXECUTIVE DIRECTOR, GEOLOGICAL SURVEY AND RESOURCE STRATEGY Jeff Haworth REFERENCE The recommended reference for this publication is: Murdie, RE, Yuan, H, Dentith, M and Lin, X 2020, A passive seismic experiment in the Perth Basin, Western Australia: Geological Survey of Western Australia, Report 208, 19p. ISBN 978-1-74168-901-3 ISSN 1834-2280 A catalogue record for this book is available from the National Library of Australia Grid references in this publication refer to the Geocentric Datum of Australia 1994 (GDA94). Locations mentioned in the text are referenced using Map Grid Australia (MGA) coordinates, Zone 50. All locations are quoted to at least the nearest 100 m. CET4.pdf 1 31/05/2013 5:24:44 PM Disclaimer This product uses information from various sources. The Department of Mines, Industry Regulation and Safety (DMIRS) and the State cannot guarantee the accuracy, currency or completeness of the information. Neither the department nor the State of Western Australia nor any employee or agent of the department shall be responsible or liable for any loss, damage or injury arising from the use of or reliance on any information, data or advice (including incomplete, out of date, incorrect, inaccurate or misleading information, data or advice) expressed or implied in, or coming from, this publication or incorporated into it by reference, by any person whosoever. Published 2020 by the Geological Survey of Western Australia This Report is published in digital format (PDF) and is available online at <www.dmirs.wa.gov.au/GSWApublications>. © State of Western Australia (Department of Mines, Industry Regulation and Safety) 2020 With the exception of the Western Australian Coat of Arms and other logos, and where otherwise noted, these data are provided under a Creative Commons Attribution 4.0 International Licence. (http://creativecommons.org/licenses/by/4.0/legalcode) Further details of geoscience publications are available from: Information Centre Department of Mines, Industry Regulation and Safety 100 Plain Street EAST PERTH WESTERN AUSTRALIA 6004 Telephone: +61 8 9222 3459 Email: [email protected] www.dmirs.wa.gov.au/GSWApublications Cover photograph: A seismometer and recording instrumentation in the basement of Mineral House, Perth, Western Australia Contents Abstract ..................................................................................................................................................................1 Introduction ............................................................................................................................................................1 Pre-Perth Basin geology ..................................................................................................................................1 Geology of the Perth Basin ....................................................................................................................................4 History .............................................................................................................................................................4 Structure ..........................................................................................................................................................4 Dandaragan Trough ..................................................................................................................................5 Darling, Muchea and Urella Faults (Darling Fault Zone) ........................................................................5 Harvey Ridge ...........................................................................................................................................5 Mandurah Terrace ....................................................................................................................................5 Vlaming Sub-basin ...................................................................................................................................5 Economic significance of the Perth Basin ..............................................................................................................5 Seismic data acquisition .........................................................................................................................................5 Seismic data processing .........................................................................................................................................6 Receiver function analysis ..............................................................................................................................6 Ambient noise tomography .............................................................................................................................6 Seismic results ........................................................................................................................................................9 Perth Basin thickness ......................................................................................................................................9 Basement and middle to lower crust .............................................................................................................10 Moho .............................................................................................................................................................10 Comparison with gravity modelling ..............................................................................................................14 Discussion ............................................................................................................................................................16 Summary ..............................................................................................................................................................16 Acknowledgements ..............................................................................................................................................16 References ............................................................................................................................................................18 Figures 1. Tectonic components of the Perth Basin and adjacent geology of the Yilgarn Craton ...............................2 2. Location of the passive seismic network in relation to the components of the Perth Basin .......................3 3. Earthquakes that occurred within 80° of the Perth Basin array ..................................................................7 4. Vertical-component waveforms for an M6.9 earthquake that occurred in Tonga .......................................8 5. Diagrammatic representation of the possible propagation modes through the Moho of an incoming P-wave ..........................................................................................................................................8 6. Diagram of the raypaths used in the receiver function common conversion point analysis ........................9 7. Location of extracted profiles from the ambient noise and common conversion point processing ..........10 8. Common conversion point profiles with error percentage estimates ........................................................11 9. Ambient noise processing .........................................................................................................................12 10. Ambient noise profiles and error plots ......................................................................................................13 11. Moho depths as given by the MoGGIE and AuSREM models .................................................................14 12. 3D block model of the Perth Basin used in the gravity modelling ............................................................15 13. Gravity anomalies of the Perth Basin model .............................................................................................17 Table 1. Units and densities used in forward gravity modelling of the Perth Basin area .......................................16 iii iv A passive seismic experiment in the Perth Basin, Western Australia by RE Murdie, H Yuan1,2, M Dentith1 and X Lin3 Abstract To assess the feasibility of using passive seismic techniques in difficult environments, a passive seismic experiment was undertaken in the onshore Perth Basin. The Perth Basin is a long, thin geological basin next to a transcrustal fault scarp in an urban environment. Data was collected from an array of 29 stations. These stations comprised a north–south transect from near