ORCID Profile
0000-0002-9654-2917
Current Organisation
University of Oxford
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Publisher: California Digital Library (CDL)
Date: 17-08-2019
Publisher: California Digital Library (CDL)
Date: 17-08-2019
Publisher: MDPI AG
Date: 10-02-2022
DOI: 10.3390/GEOSCIENCES12020081
Abstract: The authors would like to correct the published article [...]
Publisher: California Digital Library (CDL)
Date: 17-08-2019
Publisher: Wiley
Date: 03-05-2021
DOI: 10.1002/ESP.5090
Abstract: The 20 May 2016 M W 6.1 Petermann earthquake in central Australia generated a 21 km surface rupture with 0.1 to 1 m vertical displacements across a low‐relief landscape. No paleo‐scarps or potentially analogous topographic features are evident in pre‐earthquake Worldview‐1 and Worldview‐2 satellite data. Two excavations across the surface rupture expose near‐surface fault geometry and mixed aeolian‐sheetwash sediment faulted only in the 2016 earthquake. A 10.6 ± 0.4 ka optically stimulated luminescence (OSL) age of sheetwash sediment provides a minimum estimate for the period of quiescence prior to 2016 rupture. Seven cosmogenic beryllium‐10 ( 10 Be) bedrock erosion rates are derived for s les 5 km distance from the surface rupture on the hanging‐wall and foot‐wall, and three from s les 19 to 50 km from the surface rupture. No distinction is found between fault proximal rates (1.3 ± 0.1 to 2.6 ± 0.2 m Myr −1 ) and distal s les (1.4 ± 0.1 to 2.3 ± 0.2 m Myr −1 ). The thickness of rock fragments (2–5 cm) coseismically displaced in the Petermann earthquake perturbs the steady‐state bedrock erosion rate by only 1 to 3%, less than the erosion rate uncertainty estimated for each s le (7–12%). Using 10 Be erosion rates and scarp height measurements we estimate approximately 0.5 to 1 Myr of differential erosion is required to return to pre‐earthquake topography. By inference any pre‐2016 fault‐related topography likely required a similar time for removal. We conclude that the Petermann earthquake was the first on this fault in the last ca. 0.5–1 Myr. Extrapolating single nuclide erosion rates across this timescale introduces large uncertainties, and we cannot resolve whether 2016 represents the first ever surface rupture on this fault, or a 1 Myr interseismic period. Either option reinforces the importance of including distributed earthquake sources in fault displacement and seismic hazard analyses.
Publisher: American Geophysical Union (AGU)
Date: 05-2019
DOI: 10.1029/2019JB017508
Publisher: Copernicus GmbH
Date: 23-03-2020
DOI: 10.5194/EGUSPHERE-EGU2020-12092
Abstract: & & Coseismically displaced rock fragments (chips) in the near-field (less than 5 km) of the 2016 moment magnitude (M& sub& W& /sub& ) 6.1 Petermann earthquake (Australia) preserve directionality of strong ground motions. Displacement data from 1437 chips collected over an area of 100 km& sup& & /sup& along and across the Petermann surface rupture is interpreted to record combinations of co-seismic directed permanent ground displacements associated with elastic rebound (fling) and transient & ground shaking, with intensities of motion increasing with proximity to the surface rupture. The observations provide a proxy test for available models for directionality of near-field reverse fault strong ground motions in the absence of instrumental data. This study provides a dense proxy record of strong ground motions at less than 5 km distance from a surface rupturing reverse earthquake, and may help test models of near-field dynamic and static pulse-like strong ground motion for dip-slip earthquakes.& &
Publisher: California Digital Library (CDL)
Date: 09-08-2019
Publisher: California Digital Library (CDL)
Date: 08-11-2018
Publisher: California Digital Library (CDL)
Date: 17-08-2019
Publisher: Copernicus GmbH
Date: 23-03-2020
DOI: 10.5194/EGUSPHERE-EGU2020-12723
Abstract: & & The 20& sup& th& /sup& May 2016 moment magnitude (M& sub& W& /sub& ) 6.1 Petermann earthquake was the 2& sup& nd& /sup& longest single-event historic Australian surface rupture (21 km) and largest M& sub& W& /sub& on-shore earthquake in 28 years. Trench logs from two hand-dug trenches show no evidence of penultimate rupture of surface eolian sediments or underlying calcrete. Available dating of eolian dunes 140 to 500 km away from the Petermann fault indicated eolian deposition during either the last glacial maximum (approximately 20 ka) or a period of aridification at approximately 180 - 200 ka. Ten & sup& & /sup& Be cosmogenic nuclide erosion rates of bedrock outcrops at 0 to 50 km from the surface rupture trace are within error of each other between 1.4 to 2.6 mMyr& sup& -1& /sup& . These s les have approximate averaging times between 208 to 419 ka. Bedrock erosion rates, trenching results and interpretation of the landscape history suggest the 2016 event is the only surface rupturing earthquake on the Petermann fault in the last 200 to 400 kyrs, and possibly the first ever on this fault. This finding is consistent with a lack of evidence for penultimate rupture for all eleven historic Australian surface rupturing events, as described by either trenching and/or landscape analysis and bedrock erosion rates. These & #8216 one-off& #8217 events within Precambrian cratonic Australian crust are not consistent with trenching results and geomorphology of paleo-scarps within the Flinders Ranges and Eastern Australia which indicate multiple recurrent fault offset. Variable fault recurrence behaviour highlights that uniform seismic hazard modelling approaches are not applicable across Stable Continental Regions.& &
Publisher: Elsevier BV
Date: 11-2018
Publisher: American Geophysical Union (AGU)
Date: 09-2019
DOI: 10.1029/2019GL084926
Publisher: California Digital Library (CDL)
Date: 05-09-2019
Publisher: California Digital Library (CDL)
Date: 09-08-2019
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Tamarah King.