b'Education matters Education mattersat the boundary between the crustal basement and sedimentary strata. By establishing a predictive relationship between Ps arrival time and basement depth using borehole data, we provide a way to obtain an initial estimate using relatively low-cost and portable seismic stations.Using this shallow structure information, the thesis investigates the Moho topography beneath the region. Many Marina Pervukhinaof the recently deployed stations Associate Editor for Educationare located on such low-velocity Marina.Pervukhina@csiro.au sedimentary basins, leading to high-amplitude reverberations in the receiver function signal. We employ a resonance Dear Readers, with great pleasure andremoval \x1dlter to reduce the sediment admiration, we extend our warmestreverberation e\x1eect, facilitating detection congratulations to the brilliant cohortof the P-to-S conversion from the Moho, of nineteen PhD, MSc, and Honoursand providing new insights into the crust students from eleven esteemedof an under-explored region of South Australian Universities on the successfulAustralia.completion of their theses. The culmination of their dedicated e\x1eortsKati Thanda-Lake Eyre represents theFinally, the thesis focuses on and intellectual prowess marks alowest point and the largest lake (whenunderstanding the occurrence of signi\x1dcant milestone in their academic\x1dlled) in Australia. Located northeastearthquakes in the Lake Eyre region. journey and contributes immensely toof the Gawler Craton, the region isIntraplate seismicity can pose a the \x1deld of exploration geophysics. associated with pronounced intraplatesigni\x1dcant risk as it is often non-In the following pages we invite you toseismic activity and thick sedimentaryperiodic, poorly understood, and delve into the detailed summaries of thesecover, potentially obscuring the elusivesporadically recorded by sparse seismic exceptional theses, each a testamentboundary between older Proterozoicnetworks across vast continents. Within to the depth and diversity of researchand younger Phanerozoic easternAustralia, the distribution of intraplate within our community. From innovativeAustralia. Despite this, the area hadseismicity is non-uniform but instead approaches to geophysical exploration tolimited seismic data coverage due to itstends to concentrate along weak groundbreaking discoveries that push theremoteness and the harsh arid climate,zones of increased activity, such as, the boundaries of our understanding, thesecreating a seismic coverage blindeastern margin of the Gawler Craton students have exempli\x1ded the spirit ofspot in the centre of the Australianin South Australia. Over 130 new local inquiry and excellence that de\x1dnes thecontinent. To address this, two seismicevents have been recorded that would geophysics \x1deld in Australia. arrays were deployed from 2018 tootherwise have gone undetected by 2022 - the Lake Eyre Basin array andthe national network. After relocation, As we celebrate their accomplishments, weAusArray-SA array, which provide thethe pattern of earthquakes becomes also acknowledge the invaluable guidancebasis for this thesis. more spatially de\x1dned and appears and support provided by mentors, faculty,closely tied to a trans crustal scale fault and the broader geophysical community.One of aims of this thesis was tosystem at the edge of the Gawler Craton. It is through collaboration and sharedunderstand the seismic signatureInterestingly, earthquakes follow the passion that we continue to advance theof sedimentary layers within Southnatural spring system in the region frontiers of exploration geophysics. Australia using receiver functions.associated with the edge of the Great Three-quarters of the AustralianArtesian Basin, indicating a possibility Join us in recognising these emergingcontinent is covered by a blanket ofof \x1buid-assisted hydrofracturing. Thus, leaders and their contributions to our \x1deld.sedimentary and regolith material andthis thesis provides new constraints May their achievements inspire futureestimates of sedimentary thicknesson the crustal structure of a hitherto generations of geophysicists, propelling usare therefore essential to begin tounder-explored region in the heart toward new heights of scienti\x1dc discoveryexplore beneath the sedimentary cover.of the Australian continent and and technological innovation. However, active-seismic methodscontributes to the ever-increasing such as re\x1bection imaging can beglobal understanding of intraplate Theses in geophysics completed inprohibitively expensive, particularlyearthquakes.2023 PhD theses in remote areas. Therefore, to address these challenges, we utilise seismicAuby Baban, Edith Cowan University: Shubham Agrawal, Australian Nationalstations in South Australia to determineCarbon geo-sequestration and enhanced University: Seismicity and structure of thebasement depth based on the arrivaloil recovery in geological formations: Multi-eastern Gawler Craton and Lake Eyre region. time of the P-converted-to-S phasescale analysis.DECEMBER 2023 PREVIEW 24'