
Luke WedmoreUniversity of Leeds · Institute of Geophysics and Tectonics (IGT)
Luke Wedmore
Doctor of Philosophy
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Publications (29)
Historical and instrumental earthquake catalogues in low strain rate regions are not necessarily indicative of the long-term spatio-temporal distribution of seismicity. This implies that probabilistic seismic hazard analysis (PSHA) should also consider geologic and geodetic data through fault-based seismogenic sources. However, it is not always cle...
Active fault data are commonly used in seismic hazard assessments, but there are challenges in deriving the slip rate, geometry, and frequency of earthquakes along active faults. Herein, we present the open-access geospatial Malawi Seismogenic Source Model (MSSM; 10.5281/zenodo.5599616), which describes the seismogenic properties of faults that for...
Plain Language Summary
The breakup of continental plates is a fundamental part of plate tectonics, but little is known about how the plates start to stretch. In southern Africa, which is slowly extending, we use Global Positioning System (GPS) instruments to precisely measure the motion of the plates. Statistical tests show that southern Africa, wh...
Cosmogenic exposure data can be used to calculate time‐varying fault slip rates on normal faults with exposed bedrock scarps. The method relies on assumptions related to how the scarp is preserved, which should be consistent at multiple locations along the same fault. Previous work commonly relied on cosmogenic data from a single sample locality to...
The distribution of deformation during the early stages of continental rifting is an important constraint on our understanding of continental breakup. Incipient rifting in East Africa has been considered to be dominated by slip along rift border faults, with a subsequent transition to focused extension on axial segments in thinned crust and/or with...
Geomorphological features such as fault scarps and stream knickpoints are indicators of recent fault activity. Determining whether these features formed during a single earthquake or over multiple earthquakes cycles has important implications for the interpretation of the size and frequency of past events. Here, we focus on the Bilila‐Mtakataka fau...
Crustal extension is commonly thought to be accommodated by faults that strike orthogonal and obliquely to the regional trend of the minimum compressive stress (σ3). Activation of oblique faults can, however, be conceptually problematic as under Andersonian faulting, it requires preexisting crustal weaknesses, high fluid pressures, and/or stress ro...
This manuscript is a non-peer reviewed preprint deposited on the EarthArXiv platform that has been submitted to Tectonics. The distribution of deformation during early stages of continental rifting is an important constraint on our understanding of continental breakup. Early stage rifting is typically considered to be dominated by slip along rift b...
Plain Language Summary
During an earthquake, slip on a fault plane creates discrete offsets at depth and at the surface. The pattern and size of offsets at the surface can help to understand what happened in the earthquake and also leaves a record of each event in the landscape. This record is used to infer past earthquake activity and forecast the...
Progressive integration of drainage networks during active crustal extension is observed in continental areas around the globe. This phenomenon is often explained in terms of headward erosion, controlled by the distance to an external base‐level (e.g. the coast). However, conclusive field evidence for the mechanism(s) driving integration is commonl...
We provide a database of the coseismic geological surface effects following the Mw 6.5 Norcia earthquake that hit central Italy on 30 October 2016. This was one of the strongest seismic events to occur in Europe in the past thirty years, causing complex surface ruptures over an area of >400 km2. The database originated from the collaboration of sev...
We present a 1:25,000 scale map of the coseismic surface ruptures following the 30 October 2016 M w 6.5 Norcia normal-faulting earthquake, central Italy. Detailed rupture mapping is based on almost 11,000 oblique photographs taken from helicopter flights, that has been verified and integrated with field data (>7000 measurements). Thanks to the comm...
The temporal evolution of slip on surface ruptures during an earthquake is important for assessing fault displacement, defining seismic hazard and for predicting ground motion. However, measurements of near-field surface displacement at high temporal resolution are elusive. We present a novel record of near-field co-seismic displacement, measured w...
Current studies of fault interaction lack sufficiently long earthquake records and measurements of fault slip-rates over multiple seismic cycles to fully investigate the effects of interseismic loading and co-seismic stress changes on the surrounding fault network. We model elastic interactions between 97 faults from 30 earthquakes since 1349 AD in...
Many areas of the Earth’s crust deform by distributed extensional faulting and complex fault interactions are often observed. Geodetic data generally indicate a simpler picture of continuum deformation over decades but relating this behaviour to earthquake occurrence over centuries, given numerous potentially active faults, remains a global problem...
Many areas of the Earth’s crust deform by distributed extensional faulting and the occurrence of earthquakes reflects complex fault interactions. Geodetic data may indicate a simpler picture of continuum deformation over decades but relating this behaviour to earthquake occurrence over centuries, given numerous potentially active faults, remains a...
We present some preliminary results on the mapping of coseismically-induced ground ruptures following the Aug. 24, 2016, Central Italy earthquake (Mw 6.0). The seismogenic source, as highlighted by InSAR and seismological data, ruptured across two adjacent structures: the Vettore and Laga faults. We collected field data on ground breaks along the w...
In order to determine whether slip during an earthquake on the 26th September 1997 propagated to the surface, structural data have been collected along a bedrock fault scarp in Umbria, Italy. These collected data are used to investigate the relationship between the throw associated with a debated surface rupture (observed as a pale unweathered stri...
Surface slip distributions for an active normal fault in central Italy have been measured using terrestrial laser scanning (TLS), in order to assess the impact of changes in fault orientation and kinematics when modelling subsurface slip distributions that control seismic moment release. The southeastern segment of the surface trace of the Campo Fe...
Overview of combining regional strain-rate, slip-rate variability and stress transfer during fault interaction for seismic hazard assessment and understanding of continental deformation Abstract: Active faults experience earthquake rupture due to stress transfer from neighbouring earthquakes only if the fault in question is close to its failure str...
Strain-rates have been measured in the central Italian Apennines in a regular 5km and 20km square grids using field measurements of fault geometry, slip vectors and throw-rates measured across offset Late Pleistocene-Holocene landforms and sediments. Comparisons of these strain-rates with rates derived from historical seismicity and geodesy show th...
Study of the links between slip at depth and at the surface for the 1997 Colfiorito earthquakes using detailed structural mapping; the role of fault orientations. Abstract: Detailed structural mapping has been undertaken along fourteen different normal faults scarps throughout the central and northern Italian Apennines, including the Mt. Le Scalett...
Surface slip distributions for an active normal fault in central Italy have been measured using terrestrial laser
scanning (TLS), in order to assess the impact of changes in fault orientation and kinematics when modelling
subsurface slip distributions that control seismic moment release. The southeastern segment of the surface
trace of the Campo...