A5088385765- earthquake and tectonic studies
- Geology and Paleoclimatology Research
- Geological and Geochemical Analysis
- Seismology and Earthquake Studies
- Geological Modeling and Analysis
- Seismic Waves and Analysis
- Landslides and related hazards
- Botany and Geology in Latin America and Caribbean
- Marine and environmental studies
- Earthquake and Disaster Impact Studies
- Maritime and Coastal Archaeology
- Earthquake Detection and Analysis
- Archaeology and Natural History
- Geological formations and processes
- High-pressure geophysics and materials
- 3D Surveying and Cultural Heritage
- Earthquake and Tsunami Effects
- Advanced Optical Sensing Technologies
United States Bureau of Reclamation
2020-2021
Denver Federal Center
2020-2021
University of Nevada, Reno
2020-2021
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 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...
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 Warm Spring Valley fault is a right-lateral strike-slip situated in the northern Walker Lane—a region of distributed deformation that accommodates ~15% dextral shear between North American and Pacific plates. We assess Holocene slip history through new mapping for entire paleoseismic trenching investigation section fault. expressed deposits minimum 80 km upward 96 km, encompassing wide zone (~0.5–2 km) characterized by short discontinuous scarps young alluvial deposits, stepping...
Abstract In northern New Mexico, seismic hazard outside of the Rio Grande Rift (RGR) is generally considered low due to limited historical seismicity and few mapped Quaternary faults. Although region has a complex tectonic history, nearly all known faults are inactive because lack faulted deposits. Analysis lidar existing geologic geomorphic mapping permits identification characterization four on Colorado Plateau/RGR margin. The Gallina, Willow Creek, East West Brazos Peak normal or...
Northern New Mexico preserves a complex deformational history. Regional tectonic deformation spans the Paleozoic through Cenozoic, with shortening during Laramide Orogeny in late Cretaceous/early Tertiary and extension from Rio Grande rift Tertiary. Laramide-aged faults crosscut region, resulting pre-existing weaknesses crust. In north-central Mexico, most of these are assumed to be inactive based on limited historical seismicity lack identified offset Quaternary deposits. Analysis recently...
The San Juan Mountains region in southwest Colorado has few mapped active faults and is tectonically situated between the Rio Grande Rift to east, a zone of northwest-directed oblique-dextral shear south northern New Mexico. lidar datasets encompassing provide an opportunity assess fault activity for seismic hazard assessment Colorado. Here, we investigate recency slip on Cannibal Stinking Springs through reconnaissance geomorphic lineament mapping. NS-oriented ~50-km-long that parallels...