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ACT Tech talk: My Journey in Geophysics

Thursday, November 30, 2023

Title: My Journey in Geophysics


Roger Miller / Geoscience Australia

Ravin Deo/ Geoscience Australia

Date and Time: 5:00pm (AEDT time), 30th Nov 2023


Roger Miller graduated from University of Leicester (UK) with BSc (Hons) in Geophysics (Geological) in 1993 at the height of an industry downturn in Europe. After 2 years of temporary work he got his first role in the geophysics industry as a field geophysicist acquiring CSAMT, TDEM and MT, before travelling to Australia and finding employment as a Geophysical Project Manager, responsible for safe operations of geophysical field crews, often in remote areas and overseas. He has predominantly worked in industry with Fugro Ground Geophysics, Fugro Engineering Services, Fugro Airborne Surveys, Seabed Geosolutions and Petronas Carigali before joining Geoscience Australia in October this year. He has over 25 years’ experience in the interpretation and integration of multiple geophysical, geological and supplementary datasets, specialised in hydrocarbon and mineral exploration and shallow geophysics, utilising a combination of gravity gradiometry (FTG and FALCON), gravity, magnetic, marine CSEM/MT, seismic, airborne TDEM and well log data.

Ravin Deo recently joined Geoscience Australia as a geophysicist and comes from academia with experiences in Fiji and Australia. His experiences from the wider applied physics field imparts in him skills to approach a complex and technically challenging problem from various perspectives simultaneously. He has experience in numerical modelling and developing instrumentation and sensors for measurement and assessment and has strong expertise in geophysical systems for practical near-surface applications.   

ASEG WA Annual General Meeting 2023

Thursday, November 23, 2023

ASEG WA Branch AGM and networking dinner. Have your say on the future of the ASEG! Treasurer vote for office bearers for 2024.

ASEG WA is looking for committee members for 2024. All EOI need to contact Michel Nzikou at Also, we will be voting for the treasurer role as the current one is leaving us this year end. So, if your interest is in the treasurer role, please let us know as well.

Drinks and nibbles will be available from 5:30pm - 6:15pm. The committee report will commence promptly at 6:15pm. ASEG would like to thank our sponsors for their continued support.

CPP Parking offer cheap parking fee and it is very close to the venue. Also, the Parking by the State Library is nearby and is cheap too.

Register here.

ACT Tech Talk: An Interactive workflow for MT data using open-source packages and HPC

Thursday, November 23, 2023
1600 AEST
1640 AEST

Title: An Interactive workflow for MT data using open-source packages and HPC

Presenters: Jared Peacock (USGS) and Karl Kappler (DIAS Geophysical and Space Science Institute)

Date and time: 4pm (AEST time), 23rd Nov 2023


The magnetotelluric (MT) community has traditionally been composed of specialists, however with the advancement of accessibility to equipment, data, and high-performance computing more non-specialists are interested in MT data.  Open-source tools exists for working with MT data; however no publicly available coherent workflow exists.  We present a workflow for MT data that demonstrates how to use existing open-source software packages to go from raw data to a 3D resistivity model. This workflow increases the capacity of MT data to be used for open science following FAIR principles.


  1. Jared Peacock is a research geophysicist at the Geology, Minerals, Energy, and Geophysics Science Center in Menlo Park, CA. He received his Ph.D. from the University of Adelaide and B.Sc. and M.Sc. from the Colorado School of Mines, all in geophysics. Since joining the USGS In 2013, his expertise is in magnetotellurics, focusing on characterizing volcanic, geothermal, and mineral systems in 3D.
  2. Karl Kappler has held roles in the development of remote sensing and digital data processing technologies, mostly in electromagnetics and acoustics with applications ranging from unexploded ordnance, resource exploration, and borehole investigations to measurements while drilling. Karl received MS and PhD degrees in Engineering Geoscience from the University of California at Berkeley after completing a BSc in Mathematics and Physics at the University of Victoria.  Karl is an active contributor to MTH5, mt_metadata and the main developer of aurora, hosted by UBC’s SimPEG. Karl currently acts in the role of Magnetotelluric Specialist within DIAS Geophysical's R&D team in his native Canada and is also an Affiliate Research Scientist at the Space Science Institute in the USA."

Teams link: 

Click here to join the meeting

Meeting ID: 473 171 286 566
Passcode: fyja3r

EAGE 6th Asia Pacific Meeting on Near Surface Geoscience and Engineering (NSGE)

Monday, May 13, 2024

The European Association of Geoscientists and Engineers (EAGE) together with the Society of Exploration Geophysicists of Japan (SEGJ) are proud to announce that the 6th edition of Asia Pacific Meeting on Near Surface Geoscience and Engineering (NSGE) with the theme of "Smart Technologies Kind to the Planet" will take place in Tsukuba, Japan from 13-15 May 2024 incorporating the 15th SEGJ International Symposium.  

More information can be found here.

WA tech talk: Shake, rattle and roll on. Seismology at GSWA

Thursday, November 9, 2023

Title: Shake, rattle and roll on. Seismology at GSWA

Speaker: Ruth Murdie

Time and Date: 09 Nov 2023, 5:30 pm

Venue: Shoe Bar & Café




Seismological projects have part of the operational research at GSWA for the past 10 years. Up to now, they have been quite low-key concentrating on imaging specific geological targets such as the Capricorn Orogen which investigated the collision between the Pilbara and the Yilgarn Cratons, the Albany-Fraser Orogen and the SE margin of the Yilgarn Craton, The Canning Basin and the area between the Western Australian Craton and the North Australia Craton. These studies have been in conjunction with geological mapping, active seismic and MT. 

Now we are conducting longer-term projects in conjunction with GA, such as baseline monitoring in the Canning Basin, seismicity of the Goldfields Region and more detailed monitoring of the SW Seismic Zone. 

However, the current big project, which we are in the first year of is the complete 40 km coverage of Western Australia with passive seismic stations, known as WA Array. This continues the work started in other parts of the country under the EFTF as AusArray. This is a 10-year project with a specific list of products, a tight timeframe and big ambitions. 



Ruth Murdie is the Manager of the Earth Imaging and Observation Group at GSWA. She started there 10 years ago as the 3D modeller and has been involved in most of the seismology projects at GSWA. Before joining GSWA she spent some time at St Ives gold mine in the Eastern Goldfields as the exploration geophysicist. She has also worked at the Comprehensive Nuclear-Test-Ban Treaty Organisation in Vienna and was a lecturer in Geophysics at Keele University, UK. 

H-NAT 2023

Monday, November 27, 2023


H-Nat Summit is the unique annual opportunity for all Natural Hydrogen stakeholders to gather, discuss and update their knowledge about this new promising market. It is also the must-attend event to discover the latest products and services, build partnership, establish and grow business relationships, raise financing…

By joining the event : you will upgrade your knowledge on a disruptive energy, with a commercial and strategic understanding. You’ll meet the players who are driving the emergence of natural hydrogen on the international scene. 

Join the Natural hydrogen community on November 27 – 28, 2023 now and be part of the energy revolution to come!

Details here

ASEG members receive discounted entry. 

NSW Tech talk: Continental fragment collision in subduction and the dramatic uplift acceleration in the Eastern Anatolian region

Wednesday, October 18, 2023

Title: Continental fragment collision in subduction and the dramatic uplift acceleration in the Eastern Ana-tolian region

Presenter: Peigen Luo

Date and time: 1800 (Sydney) Oct 18, 2023

Registration: here


The interaction of the subducting lithosphere and embedded continental fragment is a characteristic feature in many subduction zones with complexity. We conducted dynamic subduction modelling to investigate the interactions between the subducting lithosphere and an embedded continental fragment in the Cyprus subduction zone. This study aims to elucidate the effects of the continental fragment on various aspects, including the evolution of regional uplift in the subduction back-arc, morphology of the subducting slab, and internal deformation in the central Anatolian back-arc region during the process of continental fragment indentation. The geodynamic models provide explanations for local seismic data that indicate the absence of lithosphere on the subducting slab ahead of the continental fragment and the puzzling acceleration of uplift in the Central Taurides region over the past 450,000 years. The models demonstrate that the removal of the detached slab due to slab tearing alters the surface deformation and mantle upwelling in the Central Taurides region by reducing the shortening deformation during the collision with the continental fragment. This shift in deformation results in a significant increase in the uplift rate during the subduction slab breakoff process in this region from 450,000 years ago to the present.


Peigen Luo is a dedicated researcher in the field of geological processes. After recently completing his PhD thesis, he's spent years studying plate tectonics, subduction modelling, and applying high-performance supercomputing to geological challenges. Starting his academic journey in 2020 as a PhD student, Peigen has consistently aimed to deepen his understanding and share insights with the academic community. He has also collaborated with the University of New South Wales (UNSW) in a casual professional capacity since 2023. Passionate about both geology and computational science, Peigen seeks to continuously learn and contribute to the ever-evolving field of geoscience.

WA tech night: High Density 3D seismic acquisition – An Illustrated Example from Onshore India

Thursday, October 26, 2023

Title: High Density 3D seismic acquisition – An Illustrated Example from Onshore India

Presenter: Mick Micenko

Date and time: 26 Oct 2023, 1730

Venue: Shoe Bar and Cafe




The world class Mangala oil field was discovered in Rajasthan in 2005. Even though the field had 3D seismic coverage the crest of the structure was poorly imaged and an experimental 2D seismic line was recorded across the crest later in 2004. This test line confirmed the benefits of using closer spaced source and receiver points and led to a high-density 3D survey being recorded across the field commencing in August 2006. Severe flooding in Rajasthan delayed recording for several months and the 120 square km survey was eventually completed in May 2007. Development drilling began in 2008 The HD3D was acquired with short station intervals with source and receiver spacing of 10m, increased vibrator frequency range using a single vibrator and effectively point receivers. This resulted in a 20Hz gain in bandwidth and improved signal- noise. The resulting seismic data had improved imaging of the shallow section which led to better depth migration and enhanced resolution of the structural complexities within the reservoir allowing more optimal positioning of the development wells. The Field began production in 2008 with oil initially being trucked until a heated pipeline was built to transport the oil 600km to the coast This talk will be illustrated with colourful pictures of life in India.


Mick Micenko is an Honorary Member of the ASEG and is well known for his regular Seismic Windows articles published in the Preview magazine. He started his working career acquiring gravity, magnetic and IP data across Australia for mining companies before moving into the oil industry working the Eromanga Basin with Delhi Petroleum. He has a wealth of experience in a variety of basins in Australia, NZ, India, SE Asia, Africa and the USA and became a well-respected seismic interpretation consultant. He has worked for numerous companies and taught the Seismic Interpretation course at Curtin University for many years.

ASEG NSW - “Geophysics in the Park”: How can Industry support geophysics education?

Wednesday, September 20, 2023

Title: “Geophysics in the Park”: How can Industry support geophysics education? with presenter Dr James Daniell 

Date and time: Wednesday 20th September at 1800 AEST



On Wednesday 20th September, ASEG NSW brings a presentation on Mergers, cutbacks, and closures of geoscience departments in Australia have been well documented in the media. Outreach events supported by industry and intended for university students and young professionals can provide an opportunity for ongoing education, gaining practical experience, and networking opportunities with industry professionals. In August this year, Fender Geophysics hosted its second outreach event to demonstrate basic geophysical surveying techniques. ‘Geophysics in the Park’ was attended by 14 students, 2 industry professionals, 1 academic, and 1 work experience student. Attendees were shown how to deploy, acquire, and process electrical resistivity imaging and seismic refraction datasets.
Data was acquired in Tunks Park in Cremorne (north Sydney). Tunks Park was chosen primarily as it was known to be a site with ‘thick alluvium’ and likely more interesting than most of the other local parks that were assumed to have Hawkesbury Sandstone located in the shallow subsurface. Tunks Park turned out to be an interesting choice as the existing park was actually constructed as part of land reclamation project in the 1940’s. Historical aerial photos showed the presence of an estuarine mudflats and creek, and it was this creek that was targeted by the geophysical surveying. Unsurprisingly, the creek was imaged as a highly conductive feature within the resistivity data. The refraction data differentiated a boundary between some upper ‘landfill’ and lower sediments but didn’t not image the top of bedrock. 
Despite the geophysical data providing results that were to be expected, Geophysics in the Park provided an opportunity to demonstrate some basic geophysical techniques in an area with an interesting geological history. Students benefitted from gaining some hands-on experience and participated in data acquisition and processing. There is an unmet need for education, training and demonstrations of basic geophysical techniques that can easily be filled by industry. Demonstrations of geophysical techniques do not necessarily require remote field sites. Local parks and sports ovals can be interesting targets for geophysical surveys to demonstrate the various survey techniques. As well as changes in geology and soil, buried debris, services and structures may also be suitable survey targets.
James has spent most of his career undertaking marine geophysical research for James Cook University (2012-2020) and Geoscience Australia (2001-2012). His expertise includes oceanography, geomorphology, sedimentology, geophysics, remote sensing and GIS. However, his research has been focused on mapping the seabed using acoustics and seismic reflection to understand geological processes, oceanography, and the distribution of benthic habitats in both deep and shallow water environments. Geographically his research has focussed on Torres Strait the Great Barrier Reef, however, he has also published research from the Gulf of Papua, Northwest Shelf, Gulf of Carpentaria, and the Tasman Sea. He initially studied palaeontology for a BSc at Macquarie University and followed that up with a Masters in Geology and Geophysics. He completed his PhD through the University of Sydney in 2011.
He returned to Sydney in 2020 and is now a senior geophysicist for Fender Geophysics. He is working at developing a ‘near surface’ geophysics division at Fender which will focus on environmental, groundwater and infrastructure related project. He maintains some ongoing research at JCU and enjoys not marking any more exams.

ACT tech talk: What we can and cannot know from unconstrained inversion of regional magnetic field data

Wednesday, September 27, 2023

Title: What we can and cannot know from unconstrained inversion of regional magnetic field data

Presenter: Clive Foss / CSIRO Mineral Resources

Date and time: 4pm (AEST time), 27th Sep 2023



For many years regional magnetic field data acquired by Geoscience Australia and State and Territory geological surveys has enabled and transformed geological mapping across Australia where many areas are beneath extensive cover and/or pervasive deep weathering. As computing power and availability have increased by orders of magnitude the same data that so successfully supports geological mapping is being re-purposed for building continuous three-dimensional magnetisation models. These models are in some cases accepted by their users in confidence that they are true representations of the subsurface achieved by spectacular powers of computing. However, while aeromagnetic surveys perform extremely well in mapping the horizontal locations and extents of magnetisations, recovery of models of subsurface magnetisation is severely restricted by extensive non-uniqueness. Magnetic field data is so useful for geological mapping because of the dominant expression of shallow magnetisations, in many cases directly beneath a basement unconformity. The sharp curvature of these field variations carries all the reliable information in the magnetic field data. Deeper magnetisations may cause the bulk of amplitude changes in the magnetic field without giving rise to diagnostic curvature of the field. These parts of the magnetisation cannot be reliably assigned to a specific depth or depth range. In space-filling voxel inversions this task is achieved by depth-weighting functions included in the inversion algorithms. It is these functions, not the distribution of magnetisation in the ground, that determine the depth distribution of magnetisation in the models.

I propose separation of features of sharp curvature that carry the most reliable source information (that I term ‘sweet spots’) from the remaining, much less informative field variations. This results in subsurface models that are much sparser in their apparent level of detail. It may seem a negative message, but it is not, because the distilled information can be treated with much higher confidence than continuous models in which it is not clear which aspects can be trusted and which cannot. I use examples of Australian regional magnetic field data to demonstrate analysis and interpretation of sweet-spots suitable for estimation of depth to magnetisation and sweet-spots suitable for estimation of magnetisation direction.      


Clive is a senior principal research scientist in CSIRO Mineral Resources where he works mostly on magnetic field inversion and interpretation. He has a BSc and PhD from two Earth Science departments where he learnt to integrate studies of physics and geology. His particular interest since his PhD (a long time ago) on Archean rocks of Southern Africa is in the magnetic field expression of remanent magnetisation and how direction of magnetisation can be recovered from magnetic field data. After his PhD Clive taught exploration geophysics at the University of Malaya in Kuala Lumpur where living between the geographic and magnetic equators provoked an interest in low inclination magnetic fields. Clive then moved to Bandung to work for the Bureau of Mineral Resources (BMR, now Geoscience Australia) on the AIDAB funded Indonesia – Australia Geological Mapping Project in Kalimantan. Following that Clive returned to Kuala Lumpur to work as a consultant and for ARK Geophysics based in Kuala Lumpur providing services in gravity and magnetic methods for petroleum companies throughout Southeast Asia. In 1995 Clive moved to Sydney, Australia to work with Encom Technology both contributing to the ModelVision development team and acting as senior consultant on gravity and magnetic projects worldwide. In 2009 Clive moved to his present position in CSIRO.