A5047910185- Planetary Science and Exploration
- earthquake and tectonic studies
- Astro and Planetary Science
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Space Exploration and Technology
- Geology and Paleoclimatology Research
- Geomagnetism and Paleomagnetism Studies
- Geographic Information Systems Studies
- Geochemistry and Geologic Mapping
- Visual and Cognitive Learning Processes
- Spatial Cognition and Navigation
- Landslides and related hazards
- Seismology and Earthquake Studies
- Space Science and Extraterrestrial Life
- Analytical Chemistry and Chromatography
- Seismic Waves and Analysis
- Marine and environmental studies
- Mathematics Education and Teaching Techniques
- Earthquake Detection and Analysis
- Geological formations and processes
- 3D Surveying and Cultural Heritage
- Face Recognition and Perception
- Geological and Geophysical Studies Worldwide
- Historical Geography and Cartography
University of Leeds
2012-2024
Centre for the Observation and Modelling of Earthquakes, Volcanoes and Tectonics
2021
University of Southern California
2016-2020
Viterbo University
2020
Annenberg Foundation
2020
Southern California University for Professional Studies
2020
Delaware State University
2014
University of Cambridge
2007-2013
University of Edinburgh
2009-2012
University of Oxford
2004-2010
Abstract: Crustal shortening and thickening to c . 70–85 km in the Tibetan Plateau occurred both before mainly after 50 Ma India–Asia collision. Potassic–ultrapotassic shoshonitic adakitic lavas erupted across Qiangtang ( 50–29 Ma) Lhasa blocks 30–10 indicate a hot mantle, thick crust eclogitic root during that period. The progressive northward underthrusting of cold, Indian mantle lithosphere since collision shut off source block at 10 Ma. Late Miocene–Pleistocene volcanic rocks northern...
We use InSAR and body‐wave seismology to determine independent source parameters for the 6th April 2009 M w 6.3 L'Aquila earthquake confirm that ruptured a SW‐dipping normal fault with ∼0.6–0.8 m slip. The causative Paganica had been neglected relative other nearby range‐frontal faults, partly because it has subdued geomorphological expression in comparison these faults. occurred an area marked seismic deficit geodetically determined strain accumulation. our model calculate stress changes on...
Abstract 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 continuum deformation over decades but relating this behaviour to earthquake occurrence centuries, given numerous potentially active faults, remains global problem in hazard assessment. We address challenge for an array seismogenic faults central Italian Apennines, where crustal extension devastating...
Abstract: Geological mapping and U–(Th)–Pb geochronology from the Karakoram Metamorphic Complex Baltoro granite batholith has resulted in more detailed timing constraints on tectonic evolution of Asian crust. During following collision accretion Kohistan Arc Indian plate to southern margin Asia, crustal thickening along polyphase deformation, metamorphism melting. U–Pb zircon monazite ages show that kyanite- sillimanite-grade region peaked during Oligocene–Early Miocene ( c . 28–22 Ma)...
The existence of well-preserved Holocene bedrock fault scarps along active normal faults in the Mediterranean region and elsewhere suggests a dramatic reduction rates rock weathering erosion that correlates with transition from glacial to interglacial climate. We test quantify this interpretation using case study Italian Central Apennines. are derived measurements weathering-pit depth Magnola scarp, where previous cosmogenic Cl-36 analyses constrain exposure history. To estimate average...
Using combined datasets from ground penetrating radar (GPR) and terrestrial laser scanning (TLS) we document the variety of tectono-geomorphic features that contribute to morphology bedrock scarps associated with active extensional faulting in central Italy. Measurement faulted offsets across such can provide important fault slip-rate data relevant seismic hazard analysis if ages be established for offset features. However, interpretation these is challenging when geomorphic processes as...
Surface slip distributions for an active normal fault in central Italy have been measured using terrestrial laser scanning (TLS), order to assess the impact of changes orientation and kinematics when modelling subsurface that control seismic moment release. The southeastern segment surface trace Campo Felice near city L'Aquila was mapped surveyed techniques from structural geology TLS define vertical horizontal offsets geomorphic slopes since last glacial maximum (15 ± 3 ka). geometry 43...
<p>We present some preliminary results on the mapping of coseismically-induced ground ruptures following Aug. 24, 2016, Central Italy earthquake (Mw 6.0). The seismogenic source, as highlighted by InSAR and seismological data, ruptured across two adjacent structures: Vettore Laga faults. We collected field data breaks along whole deformed area different scenarios on-fault coseismic displacement arise from these observations. To north, fault, surface faulting can be mapped quite...
The Karakoram fault is a major NW–SE-aligned dextral strike-slip that has accommodated minor extrusion of thickened Tibetan crust since the Mid-Miocene. Controversy exists as to whether lithospheric in scale, resulting synkinematic metamorphism and granite melting, or it an upper crustal cutting through earlier metamorphic granitic rocks. Structural, geochronological data from show that: (1) genesis occurred prior shearing, meaning U–Pb zircon monazite ages deformed granites cannot be used...
This paper documents evidence of surface faulting associated with the 6 April 2009 moderate-sized earthquake (ML 5.8, Mw 6.3) in central Apennines Italy, which caused major damage to town L’Aquila and its surroundings. Coseismic ruptures were mapped for a minimum distance 2.6 km along Paganica fault, fault still poorly investigated relative other active faults nearby, bound much wider range fronts. Surface rupture length (SRL) maximum displacement parameters (2.6 10–15 cm, respectively) are...
Abstract The Himalayan orogen represents a “Composite Orogenic System” in which channel flow, wedge extrusion, and thrust stacking operate separate “Orogenic Domains” with distinct rheologies crustal positions. We analyze 104 samples from the metamorphic core (Greater Sequence, GHS) bounding units of Annapurna‐Dhaulagiri Himalaya, central Nepal. Optical microscopy electron backscatter diffraction (EBSD) analyses provide record deformation microstructures an indication active crystal slip...
Phyllosilicate-rich fault rocks are common in large-scale zones and can dramatically impact rheology. Experimental evidence suggests that multi-mechanism frictional-viscous flow (FVF) may operate such lithologies, potentially significantly weakening mature cores. We report microstructures indicative of FVF exhumed phyllonites the Karakoram Fault Zone (KFZ), NW India. These include interconnected muscovite foliae, lack quartz/feldspar crystal preferred orientations, sutured grains overgrowths...
Uncertainty concerning the processes responsible for slip-rate fluctuations associated with temporal clustering of surface faulting earthquakes is a fundamental, unresolved issue in tectonics, because strain-rates accommodated by fault/shear-zone structures are key to understanding viscosity structure crust and seismic hazard. We constrain timing amplitude that occurred on three active normal faults central Italy over time period 20–30 kyrs, using situ 36Cl cosmogenic dating fault planes....
A key factor in interpreting the significance of large‐scale strike‐slip faults models continental deformation is an understanding temporal relationship between faulting and magmatism. Knowledge when a fault initiated essential order to determine its long‐term slip rate accommodating strain. We review structural criteria that identify whether magmatism prekinematic or synkinematic with apply these major Tibet‐bounding fault. Along Karakoram fault, western Tibet, opinion divided (1) those...
Using 3D terrestrial laser scan (TLS) technology, we have recorded postseismic deformation on and adjacent to the surface rupture formed during 6th April 2009 L'Aquila normal faulting earthquake (Mw 6.3). modeling techniques repeated surveys 8–124 days after earthquake, produced a 4D dataset of across 3 × 65 m area at high horizontal spatial resolution. We detected millimetre‐scale movements partitioned between discrete slip development hangingwall syncline over 10's meters. interpret...
The channel-flow model for the Greater Himalayan Sequence (GHS) of orogen involves a partially molten, rheologically weak, mid-crustal layer "flowing" southward relative to upper and lower crust during late Oligocene–Miocene. Flow was driven by topographic overburden, underthrusting, focused erosion. We present new structural thermobarometric analyses from GHS in Annapurna-Dhaulagiri Himalaya, central Nepal; these data suggest that exhumation, cooled, strengthened, transformed weak "active...
Abstract Cosmogenic exposure data can be used to calculate time‐varying fault slip rates on normal faults with exposed bedrock scarps. The method relies assumptions related how the scarp is preserved, which should consistent at multiple locations along same fault. Previous work commonly relied cosmogenic from a single sample locality determine rate of Here we show that by applying strict sampling criteria and using geologically informed modeling parameters in Bayesian‐inference Markov chain...