A5011059344- earthquake and tectonic studies
- Geological and Geochemical Analysis
- Seismology and Earthquake Studies
- Geology and Paleoclimatology Research
- Seismic Waves and Analysis
- Landslides and related hazards
- High-pressure geophysics and materials
- Earthquake Detection and Analysis
- Advanced Polymer Synthesis and Characterization
- Polymer composites and self-healing
- Geochemistry and Geologic Mapping
- Forensic and Genetic Research
- Archaeology and Natural History
- Polymer Nanocomposites and Properties
- Geological and Geophysical Studies Worldwide
- GNSS positioning and interference
- Geological and Geophysical Studies
- Anomaly Detection Techniques and Applications
- Yersinia bacterium, plague, ectoparasites research
- Medieval History and Crusades
- 3D Surveying and Cultural Heritage
- Geological and Tectonic Studies in Latin America
- Plant Taxonomy and Phylogenetics
- Earthquake and Disaster Impact Studies
- Geological Modeling and Analysis
University of Oxford
2020-2024
Centre for the Observation and Modelling of Earthquakes, Volcanoes and Tectonics
2022
University of Nevada, Reno
2015-2021
Northwestern University
2020-2021
San Diego State University
2020
ABSTRACT Surface rupture in the 2019 Ridgecrest, California, earthquake sequence occurred along two orthogonal cross faults and includes dominantly left-lateral northeast-striking Mw 6.4 foreshock right-lateral northwest-striking 7.1 mainshock. We present >650 field-based, surface-displacement observations for these ruptures synthesize our results into cumulative along-strike displacement distributions. Using data, we calculate gradients compare with historical strike-slip eastern...
Abstract The Mw 6.4 and 7.1 Ridgecrest earthquake sequence occurred on 4 5 July 2019 within the eastern California shear zone of southern California. Both events produced extensive surface faulting ground deformation Indian Wells Valley Searles Valley. In weeks following earthquakes, more than six dozen scientists from government, academia, private sector carefully documented ground-deformation features. As December 2019, we have compiled a total 6000 observations; approximately 1500 these...
Abstract The M 6.5 Monte Cristo Range earthquake that occurred in the central Walker Lane on 15 May 2020 was largest Nevada 66 yr and resulted a multidisciplinary scientific field response. result of left-lateral slip along largely unmapped parts Candelaria fault, one series east–northeast-striking faults comprise Mina deflection, major right step north–northwest structural grain Lane. We describe characteristics surface rupture document distinct differences style orientation fractures...
ABSTRACT The July 2019 Ridgecrest earthquakes in southeastern California were characterized as surprising by some, because only ∼35% of the rupture occurred on previously mapped faults. Employing more detailed inspection pre-event high-resolution topography and imagery combination with field observations, we document evidence active faulting landscape along entire fault system. Scarps, deflected drainages, lineaments contrasts topography, vegetation, ground color demonstrate previous slip a...
Fault scarps and uplifted terraces in young alluvium are frequent occurrences along the trace of northerly dipping Himalayan frontal thrust (HFT). Generally, it was expected that 25 April 2015 M 7.8 Gorkha earthquake Nepal would produce fresh fault trace. Contrary to expectation, Interferometric Synthetic Aperture Radar aftershock studies soon indicated rupture HFT confined subsurface, terminating on order 50 km north HFT. We undertook a field survey faults lineaments within Kathmandu...
Abstract The northeastern Tibetan Plateau and its surroundings are a tectonically complex region resulting from the continuing collision of India with Eurasia. We studied tectonic deformation this using GPS block model, which was produced most recently published, dense, precise, complete velocities available combined detailed fault geometry. comparison between our preferred model numerous faults fewer demonstrates need for inclusion lesser active affords closer examination strain...
Abstract The northwest striking Qishan‐Mazhao fault (QMF) accommodates complex deformation in the Tibet‐Ordos transition zone. We studied geologic and geomorphic expression of QMF using interpretations high‐resolution satellite images structure‐from‐motion models combined with detailed field investigations. Displaced loess tablelands, stream channels, fluvial terraces show that is predominately a left‐lateral strike‐slip minor normal component. magnetic susceptibility optically stimulated...
Abstract An excavation across the Himalayan Frontal Thrust near Damak in eastern Nepal shows displacement on a fault plane dipping ~22° has produced vertical separation scarp equal to 5.5 m. Stratigraphic, structural, geometrical, and radiocarbon observations are interpreted indicate that is result of single earthquake 11.3 ± 3.5 m dip‐slip occurred 1146–1256 A.D. Empirical scaling laws thrust earthquakes characterized by average displacements this size may produce rupture lengths 450...
Abstract Geodesy shows that ∼7 mm/yr of dextral shear is accumulating across the Central Walker Lane in absence through‐going strike‐slip faults. To better understand how this accommodated, we describe and quantify patterns slip rates active faults extending between Lake Tahoe basins. Lidar data geomorphic mapping show linear fault traces stepping geometries consistent with accommodation oblique‐slip motion along Wassuk Smith Valley faults, whereas Mason Antelope valley are primarily...
Abstract We investigate the present‐day strike‐slip faulting and intracontinental deformation of North China using horizontal GPS velocities a block modeling strategy. The data demonstrate that fault slip rates rotations in can be better constrained where influence groundwater extraction has been reduced by applying median spatial filtering velocity field. modeled senses motion on active faults are generally good agreement with geological estimates. left‐lateral rate along boundary Weihe...
Abstract Here we present the results of first paleoseismic study Kura fold‐thrust belt in Azerbaijan based on field mapping, fault trenching, and Quaternary dating. Convergence at rates ∼10 mm/yr between Arabian Eurasian Plates is largely accommodated by which stretches central Georgia along southern front Greater Caucasus (45–48°E). Although destructive historic earthquakes are known here, little about active faults responsible for these earthquakes. A trench was excavated across a 2‐m‐high...
Abstract A reexamination of the observations and analysis recently reported to conclude that an 800 km section Himalayan Frontal Thrust ruptured in 1255 A.D. shows conclusion is flawed without merit because misinterpretations trench logs incorrect interpretation radiocarbon statistics.
Abstract Aerial photographs were collected in the days immediately following 4–5 July 2019 Ridgecrest earthquake sequence (e.g., Barnhart et al., 2019) along publically accessible sections of surface ruptures south California 178. These photos then used to produce structure-from-motion point cloud models and orthophotos with resolutions varying from ∼1 20 cm/pixel. Here, are released initial observations nature presented.
ABSTRACT The Nine Mile Ranch (NMR) sequence began with three Mw 5.4–5.6 earthquakes within one hour of each other in December 2016 the remote area Fletcher Valley, Nevada; only 4 min separated first and second events. We analyze this complex earthquake Walker Lane to determine geometry driving mechanism(s), improve understanding deformation seismic hazard region. Field reconnaissance found that these caused significant damage ranch house but no surface rupture. precisely relocate 6000+...
ABSTRACT The 15 May 2020 Mw 6.5 Monte Cristo Range earthquake (MCRE) in Nevada, United States, is the largest instrumental event Mina deflection—a zone of east-trending left-lateral faults accommodating a right step between northwest-trending right-lateral Walker Lane. MCRE ruptured highly distributed faulting area with muted geomorphic expressions, motivating us to characterize behavior an on structurally immature fault system. Inverse modeling Interferometric Synthetic Aperture Radar...
Abstract The Tieluzi Fault is the largest structure in East Qinling Mountains, and considered to be easternmost continuation of Altyn Tagh‐Haiyuan‐Qinling System (AHQFS) that allows eastward extrusion Tibetan Plateau South China Block. We studied fault geometry kinematics using field investigations, detailed interpretations high‐resolution satellite imagery digital elevation models, late Quaternary dating methods. Paleoseismic investigations indicate most recent earthquake along occurred...
The northern Walker Lane (southwestern USA) accommodates ∼5–7 mm/yr of right-lateral Pacific–North America relative plate motion. northwest trend major faults in the is interrupted by presence northeast-striking left-lateral within Carson and Excelsior domains. Previous studies domain have suggested that slip on Olinghouse, Carson, Wabuska lineaments transtensional dextral shear through clockwise rotation intervening crustal blocks. Our observations confirm document late Pleistocene–Holocene...