A5016742184- earthquake and tectonic studies
- Seismic Waves and Analysis
- Seismology and Earthquake Studies
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Landslides and related hazards
- Earthquake Detection and Analysis
- Seismic Performance and Analysis
- Seismic Imaging and Inversion Techniques
- Geology and Paleoclimatology Research
- Drilling and Well Engineering
- Geophysical Methods and Applications
- Software System Performance and Reliability
- Rock Mechanics and Modeling
- Remote Sensing and Land Use
- Geophysics and Sensor Technology
- Smart Grid Security and Resilience
- Geographic Information Systems Studies
- Geological Modeling and Analysis
- Software Testing and Debugging Techniques
- Infrastructure Resilience and Vulnerability Analysis
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Methane Hydrates and Related Phenomena
- Mechanical stress and fatigue analysis
Pacific Environment
2017-2024
PG&E Corporation (United States)
2017-2024
Oregon State University
2015-2016
Research Article| June 12, 2018 Surface Rupture of Multiple Crustal Faults in the 2016 Mw 7.8 Kaikōura, New Zealand, Earthquake Nicola J. Litchfield; Litchfield aGNS Science, P.O. Box 30‐368, Lower Hutt 5040, n.litchfield@gns.cri.nz Search for other works by this author on: GSW Google Scholar Pilar Villamor; Villamor Russ Van Dissen; Dissen Andrew Nicol; Nicol bUniversity Canterbury, Private Bag 4800, Christchurch 8140, Zealand Philip M. Barnes; Barnes cNational Institute Water and...
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...
Research Article| July 01, 2016 Shortening rate and Holocene surface rupture on the Riasi fault system in Kashmir Himalaya: Active thrusting within Northwest Himalayan orogenic wedge Y. Gavillot; Gavillot 1College of Earth, Ocean, Atmospheric Sciences, Oregon State University, Corvallis, 97331, USA †Present address: 1115 NW 35th Street, 97330, USA; ygavillot@gmail.com. Search for other works by this author on: GSW Google Scholar A. Meigs; Meigs D. Yule; Yule 2Department Geological California...
We provide a summary of the surface fault ruptures produced by Mw7.8 14 November 2016 Kaikōura earthquake, including examples damage to engineered structures, transportation networks and farming infrastructure direct rupture displacement. also an overview earthquake in context source model estimated ground motions from current (2010) version National Seismic Hazard Model (NSHM) for New Zealand. A total 21 faults ruptured along c.180 km long zone during some that were unknown prior event. The...
Abstract Tectonic landforms and surficial lithologic age are essential data for producing quality late Quaternary fault maps predicting coseismic rupture location before an earthquake. However, we lack a clear understanding of the relationship between tectonic shallow earthquake processes how relates to landform preservation. We assess error (rupture‐to‐fault separation distance) displacement residual (difference observed predicted displacement) vary with four historical earthquakes. Certain...
Research Article| June 12, 2018 Coseismic Rupture and Preliminary Slip Estimates for the Papatea Fault Its Role in 2016 Mw 7.8 Kaikōura, New Zealand, Earthquake Robert M. Langridge; Langridge aGNS Science, P.O. Box 30‐368, Lower Hutt 5040, R.Langridge@gns.cri.nz Search other works by this author on: GSW Google Scholar Julie Rowland; Rowland bThe University of Auckland, Private Bag 92019, Auckland 1142, Zealand Pilar Villamor; Villamor Joshu Mountjoy; Mountjoy cNational Institute Water...
Studies of active fault zones have flourished with the availability high-resolution topographic data, particularly where airborne light detection and ranging (lidar) structure from motion (SfM) data sets provide a means to remotely analyze submeter-scale geomorphology. To determine surface offset at point along strike-slip earthquake rupture, geomorphic features (e.g., stream channels) are measured days centuries after event. Analysis these cumulatively produces distributions for successive...
Mapping of neotectonic faults is critical to the scientific study earthquake processes and surface rupture hazard analysis. Geologists commonly map fault traces from remote sensing datasets by interpreting tectonic landforms formed past earthquakes. However, evidence for faulting not always straightforward observe interpret. Even experts differently. We seek understand variability in trace mapping mappers with different experience, ranging undergraduate students professional geologists...
Abstract Probabilistic seismic hazard analysis (PSHA) is the state‐of‐the‐art method to estimate ground motions exceeded by large, infrequent, and potentially damaging earthquakes; however, a fundamental problem lack of an accepted for both quantitatively validating refining estimates using empirical geological data. In this study, reduce uncertainties in such estimates, we present new that uses data from precariously balanced rocks (PBRs) coastal Central California. We calculate probability...
Fault displacement models are a key component of probabilistic fault hazard analysis (PFDHA), providing the probability density function. We present new model developed using comprehensive database compiled for Displacement Hazard Initiative (FDHI) project. The predicts total net across multi-stranded surface ruptures as function moment magnitude and position along rupture length. provide separate strike-slip, reverse, normal faulting. A bilinear scaling is used to capture steeper smaller...
The data sets, model formulations, and results from four new fault displacement models (FDMs) developed through the Fault Displacement Hazard Initiative (FDHI) Project are summarized compared with each other previously published FDMs. were using FDHI Database provide predictions for principal or aggregate surface displacement, where is combined across distributed ruptures. Different definitions of used among models, differences should be considered when comparing multiple in a logic tree....
Abstract Earthquake surface-fault rupture location uncertainty is a key factor in fault displacement hazard analysis and informs risk mitigation strategies. Geologists often predict future locations from mapping based on the geomorphology interpreted remote-sensing data sets. However, surface processes can obscure location, traces may be mapped error, not break every trace. We assessed how well geomorphology-based predicted ruptures for seven earthquakes: 1983 M 6.9 Borah Peak, 2004 6.0...
Hydropower infrastructure, the primary source of electricity in Nepal, experienced severe damage following 2015 Gorkha earthquake sequence, resulting a 15% loss country's energy production. The performance hydropower infrastructure during and after sequence was one unique focuses Geotechnical Extreme Events Reconnaissance (GEER) study. GEER team visited damaged projects along Trishuli Sunkoshi rivers by road on foot, with ongoing 465-MW Upper Tamakoshi project helicopter. cause to landslide...
ABSTRACT Understanding fault rupture deformation patterns, especially in complex zones, has fundamental implications on seismotectonic studies and hazard mitigation for the built environment. The 2019 Mw 6.4 7.1 Ridgecrest earthquake ruptures offer an opportunity to quantify patterns surface displacements from a rupture. Our field reconnaissance, within 18 hr of event, documented relatively broad zone up few kilometers wide vicinity gas transmission pipeline intersected by south Highway 178....
<p>Probabilistic seismic hazard analysis (PSHA) models typically provide estimates of ground motions for return periods that exceed historical observations. It is therefore important to develop quantitative methods evaluate and refine motion long periods, especially in proximity major earthquake sources where can be very high. Here we empirical constraints over 10,000s years on from onshore offshore central California using the distribution, age fragility (probability toppling...