Brendan Gilbert Duffy

Brendan Gilbert Duffy
University of Melbourne | MSD · School of Earth Sciences

PhD

About

42
Publications
16,150
Reads
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796
Citations
Introduction
Brendan Gilbert Duffy currently teaches at the School of Earth Sciences, University of Melbourne. His current project concerns the 'Tectonics of the Banda Arc.'
Additional affiliations
February 2016 - present
University of Melbourne
Position
  • Fellow
March 2015 - December 2015
Terra Search Pty Ltd
Position
  • Structural geologist
June 2013 - December 2014
University of Canterbury
Position
  • Lecturer in Structural Geology

Publications

Publications (42)
Article
Full-text available
Palynology of exhumed Pliocene marine turbidites and marl beds on the island of Timor provide insights into crustal deformation in the Indonesian region. Between ca. 4.5 and ca. 3 Ma, palynomorphs were sourced primarily from Australia and New Guinea, with increasing swamp and mangrove elements sourced from an emerging proto-Timor. Following ca. 3.1...
Data
Full-text available
Dextral slip at the western end of the east-west–striking Greendale fault during the 2010 M W 7.1 Darfi eld earthquake trans-ferred onto a northwest-trending segment, across an apparent transtensional zone, here named the Waterford releasing bend. We used detailed surface mapping, differential analysis of pre-and postearthquake light de-tection and...
Article
Full-text available
Structural studies of synorogenic basins in Timor usingfield and remote sensing techniques provide new structural and geomorphic evidence for syn-collisional extension in the converging plate boundary zone between the Australian Plate and Banda Arc. Fault mapping and kinematic analysis at scales ranging from outcrop (<1m 2 ) to the dimensions of th...
Article
New sedimentary geochemistry and petrographic analyses provide the most extensive sedimentary documentation yet of the rapid denudation of the young Timor orogen. The data from three basins including two widely-separated, well-dated sections of the Synorogenic Megasequence of Timor-Leste, and a re-dated DSDP 262, constrain the source and timing of...
Article
Full-text available
Prehistoric timescales, volcanic hazard assessment, and understanding of volcanogenic climate events rely on accurate dating of prehistoric eruptions. Most late Quaternary eruptions are dated by 14C measurements on material from close to the volcano that may be contaminated by geologic-sourced infinite-age carbon. Here we show that 14C ages for the...
Article
The Kaikōura Peninsula lies at the transition from subduction to continental collision at the southern end of the Hikurangi subduction system. This study uses a 2012 lidar survey over the Kaikōura Peninsula to re-map a flight of four uplifted Late Pleistocene marine terraces at high resolution. The lidar shows that the terraces are being progressiv...
Article
Full-text available
Earthquakes can influence flood hazards by altering the flux, volumes, and distributions of surface and/or subsurface waters and causing physical changes to natural and engineered environments (e.g., elevation, topographic relief, permeability) that affect surface and subsurface hydrologic regimes. This paper analyzes how earthquakes increased floo...
Article
Full-text available
Timor’s Lolotoi Metamorphic Complex outcrops regionally on Timor and is critical to the interpretation of hydrocarbon prospectivity, which is obscured by complex geology. Reprocessing of 1994 data by conventional DMO workflow in 2017 improved imaging of relatively undeformed coastal Neogene basins, and hinted at coherent energy in the deeper sectio...
Article
Full-text available
The structural context and Australian versus Asian affinity of regional outcrop of Timor’s Lolotoi Metamorphic Complex are critical to the interpretation of hydrocarbon prospectivity but are obscured by complex geology and still strongly debated. Timor Resources and Geomage used Common-Offset Multi-Focus (CO-MF) processing to vastly improve imaging...
Conference Paper
Full-text available
The structural context and Australian versus Asian affinity of regional outcrop of Timor’s Lolotoi Metamorphic Complex are critical to the interpretation of hydrocarbon prospectivity but are obscured by complex geology and still strongly debated. Timor Resources and Geomage used Common-Offset Multi-Focus (CO-MF) processing to vastly improve imaging...
Article
Full-text available
We use Coulomb stress change (CSC) analyses and seismicity data to model the physical and statistical behaviour of the multi-fault source of the 4th September 2010 Mw7.1 Darfield earthquake in New Zealand. Geodetic and seismologic data indicate this earthquake initiated on a severely-misoriented reverse fault and propagated across a structurally co...
Preprint
Full-text available
A series of Coulomb stress models are used to simulate the independently-derived (Holden et al., 2011) rupture process of Mw 7.1 Darfield earthquake. The 7-fault source model of Beavan et al. (2012) is used for all models. Model differences include (i) differences in the static stress thresholds (0,1,5,10 MPa) that must be reached or exceeded to in...
Article
Full-text available
The management of groundwater quality is a critical issue in developing nations where sanitation and drinking water targets are commonly addressed by facilitating access to groundwater, which is then managed as a common-pool resource. We investigate the quality of the shallow unconfined groundwater in Dili’s alluvial fan system, which 50% of Dili’s...
Preprint
Full-text available
The management of groundwater quality is a critical issue in developing nations where sanitation and drinking-water targets are commonly addressed by facilitating access to groundwater, which is then managed as a common-pool resource. We investigate the quality of the shallow unconfined groundwater in Dili’s alluvial fan system, which 50% of Dili’s...
Conference Paper
Full-text available
Slip on an offshore fault uplifted and tilted the Kaikoura Peninsula during the 2016 Kaikoura earthquake. Analysis of a 2012, 1m Lidar DEM shows that the uplifted Kaikoura marine terraces have been progressively tilted in the same manner since 120 ka. A Monte-Carlo analysis of tilt-age relationships, based on a model of listric faulting, and using...
Conference Paper
Full-text available
We examine 257 finite-fault rupture models for 135 moment magnitude (Mw) 4.1 to 8.1 continental earthquakes to estimate how many source faults ruptured in each earthquake. We use fault geometries and rupture kinematic criteria to estimate fault populations. The minimum observed Mw for multi-fault rupture is 6.0. Approximately ~37% of the 135 earthq...
Article
The 2010 Mw 7.1 Darfield earthquake in New Zealand produced a 30 km-long surface rupture trace across a low relief alluvial landscape. The surface rupture was sourced from at least three geometrically distinct crustal faults (Greendale Fault East, Central, and West) with overlapping parabola-shaped surface displacement distributions and maximum co-...
Article
Full-text available
Geophysical imaging of coastal dune stratigraphy near Haast, South Westland, provides insight into coseismic dune modification on a seismically active coastline. Complementary ground-penetrating radar and electrical imaging responses reveal low-angle features that apparently truncate and offset dune bedding. Complex attribute analysis of the GPR pr...
Article
Seismic shaking and tectonic deformation during strong earthquakes can trigger widespread environmental effects. The severity and extent of a given effect relates to the characteristics of the causative earthquake and the intrinsic properties of the affected media. Documentation of earthquake environmental effects in well-instrumented, historical e...
Article
Full-text available
The Springfield thrust fault at Dalethorpe, west Canterbury, New Zealand, provides a test case to explore the correlation between shear wave velocities at a range of scales, and direct field observations of distributed deformation and outcrop properties. The Springfield fault ruptures to the surface through hard Torlesse greywacke, overlain on a fl...
Article
Full-text available
Inconsistent polarity patterns in sediments are a common problem in magnetostratigraphic and paleomagnetic research. Multiple magnetic mineral generations result in such remanence 'haystacks'. Here, we test whether end-member modelling of isothermal remanent magnetization acquisition curves as a basis for an integrated rock magnetic and microscopic...
Data
Schmidt hammer (SH) R-values are reported for surface clasts from numerically dated Holocene and Pleistocene fluvial terraces in the South Island of New Zealand. The R-values are combined with previously obtained weathering rind, radiocarbon, terrestrial cosmogenic nuclide and luminescence terrace ages to derive SH R-value chronofunctions for greyw...
Article
Full-text available
Rupture of the Greendale Fault during the 4 September 2010, MW7.1 Darfield (Canterbury) earthquake produced a zone of ground-surface rupture that severely damaged several houses, buildings and lifelines. Immediately after the earthquake, surface rupture features were mapped in the field and from digital terrain models developed from airborne Light...
Article
Pristine detrital Platygyra corals were discovered in an exhumed package of syn-orogenic marine sediments on the island of Timor in the eastern Indonesian region and dated using U-Pb techniques. A single coral from the upper part of the sequence yields a U-238/Pb-206-Pb-207/Pb-206 concordia age of 2.66 +/- 0.14 (2 sigma) Ma that is supported by cor...
Article
Full-text available
The September 2010 Mw 7.1 Darfield (Canterbury) earthquake in New Zealand is one of the best-recorded earthquakes of this magnitude. The earthquake occurred on a previously unidentified fault system and generated a 29.5 ± 0.5-km-long surface rupture across a lowrelief agricultural landscape. High-accuracy measurements of coseismic displacements wer...
Article
Full-text available
The island of Timor consists in part of synorogenic, late Miocene to Pleistocene mid-bathyal marine sequences that record structural, sedimentological, and palynological aspects of the collision between the northern Australian continental shelf and the Banda arc. Structural analysis of these sediments in the Viqueque, Laleia and Marobo Basins of Ti...
Article
Surface rupture on the dextral strike-slip Greendale fault during the 2010 Mw 7.1 Darfield (Canterbury), earthquake in New Zealand terminated in a releasing bend at the western end of the fault. Our first-ever co-seismic application of multi-temporal aerial LiDAR, coupled with cadastral surveying, real time kinematic GPS scarp profiling and offset...
Article
This paper provides a photographic tour of the ground-surface rupture features of the Greendale Fault, formed during the 4 September 2010 Darfield earthquake. The fault, previously unknown, produced at least 29.5 km of strike-slip surface deformation of right-lateral (dextral) sense. Deformation, spread over a zone between 30 and 300 m wide, consis...
Conference Paper
Full-text available
Surface rupture of the previously unrecognised Greendale Fault extended west-east for ~30 km across alluvial plains west of Christchurch, New Zealand, during the M w 7.1 Darfield (Canterbury) earthquake of September 2010. Surface rupture displacement was predominantly dextral strike-slip, averaging ~2.5 m, with maxima of ~5 m. Vertical displacement...
Data
Full-text available
Surface rupture of the previously unrecognised Greendale Fault extended west-east for ~30 km across alluvial plains west of Christchurch, New Zealand, during the M w 7.1 Darfield (Canterbury) earthquake of September 2010. Surface rupture displacement was predominantly dextral strike-slip, averaging ~2.5 m, with maxima of ~5 m. Vertical displacement...
Article
Full-text available
The Mw 7.1 Darfield (Canterbury) earthquake of 4 September 2010 (NZST) was the first earthquake in New Zealand to produce ground-surface fault rupture since the 1987 Edgecumbe earthquake. Surface rupture of the previously unrecognised Greendale Fault during the Darfield earthquake extends for at least 29.5 km and comprises an en echelon series of e...
Data
Full-text available
The M w 7.1 Darfield (Canterbury) earthquake of 4 September 2010 (NZST) was the first earthquake in New Zealand to produce ground-surface fault rupture since the 1987 Edgecumbe earthquake. Surface rupture of the previously unrecognised Greendale Fault during the Darfield earthquake extends for at least 29.5 km and comprises an en echelon series of...
Article
Full-text available
At 4:35 A.M. local time on 4 September (1635 UTC, 3 September), a previously unrecognized fault system ruptured in the Canterbury region of New Zealand's South Island, producing a moment magnitude (Mw) 7.1 earthquake that caused widespread damage throughout the area. In stark contrast to the 2010 Mw 7.0 Haiti earthquake, no deaths occurred and only...
Article
Bulk rock strength is greatly dependent on fracture density, so that reductions in rock strength associated with faulting and fracturing should be reflected by reduced shear coupling and hence S-wave velocity. This study is carried out along the Canterbury rangefront and in Otago. Both lie within the broader plate boundary deformation zone in the S...

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Projects

Project (1)
Project
understanding the timing and processes of evolution of the Timor forearc-continent collision zone, and implications for resource potential