Significant uncertainty remains in how and where crustal shortening occurs throughout the eastern Cascade Range in Washington State. Using lidar imagery, we identified a ~5 km long lineament in Swakane canyon near Wenatchee, roughly coincident with a strand of the Entiat fault. Topographic profiles across the lineament reveal a southwest-side-up break in slope with an average of ~3 m of vertical separation of the hillslope surface. We consider a range of possible origins for this feature, including differential erosion across a fault-line scarp, slope failure (sackung or landslide), and surface deformation across an active fault strand. Based on trenching, radiocarbon and luminescence dating, and ground penetrating radar (GPR) across the lineament, we conclude that warped saprolite observed in the shallow subsurface is most consistent with southwest-side-up folding caused by blind reverse faulting at depth. Following this reasoning, dating of overlying colluvial deposits suggests at least one Holocene earthquake occurred on this strand of the southern Entiat fault with an approximate vertical separation of ≥1 m. GPR reveals up to 4 m of cumulative vertical separation of the saprolite, suggesting a history of multiple earthquakes on the structure. Taken in context with other potential fault-related lineaments along the Entiat fault, our interpretation of Holocene earthquakes in Swakane canyon could suggest reactivation of longer sections of the Entiat fault, as well as other bedrock faults in the eastern Cascades. Although active erosion and slow strain rates lead to a subdued geomorphic expression of recent deformation, we conclude that the reactivated Entiat fault represents a seismogenic structure that should be considered in regional seismic hazard analyses. The difficulty of recognizing low slip-rate structures in forested and mountainous terrain underscores the importance of additional lidar surveys and geological and geophysical studies for fully understanding seismic hazard in regions with infrequent but potentially large earthquakes.

These datasets provide lineament mapping, catchment-averaged metrics of hypsometry and channel steepness, field observations, and a structure from motion model and orthomosiac photograph of sites in the Eastern Tennessee seismic zone in eastern Tennessee, USA. The lineament mapping contains linework of possible neotectonic features mapped from 1-m lidar data. Catchment-averaged metric of hypsometry and channel steepness are for selected catchments along the Powell River in northern Tennessee. Field observations provides points and notes of reconnaissance fieldwork to describe and document select lineaments in the Powell River and Oak Ridge areas. The structure from motion model and orthomosiac photograph document the Little River exposure described in previous studies. These datasets are associated with the manuscript: Thompson Jobe, J. A., R. W. Briggs, R. D. Gold, L. Bauer, and C. Collett (in review). Limited evidence for Late Pleistocene tectonic surface deformation in the Eastern Tennessee Seismic Zone, USA.

These datasets provide lineament mapping, catchment-averaged metrics of hypsometry and channel steepness, field observations, and a structure from motion model and orthomosiac photograph of sites in the Eastern Tennessee seismic zone in eastern Tennessee, USA. The lineament mapping contains linework of possible neotectonic features mapped from 1-m lidar data. Catchment-averaged metric of hypsometry and channel steepness are for selected catchments along the Powell River in northern Tennessee. Field observations provides points and notes of reconnaissance fieldwork to describe and document select lineaments in the Powell River and Oak Ridge areas. The structure from motion model and orthomosiac photograph document the Little River exposure described in previous studies. These datasets are associated with the manuscript: Thompson Jobe, J. A., R. W. Briggs, R. D. Gold, L. Bauer, and C. Collett (in review). Limited evidence for Late Pleistocene tectonic surface deformation in the Eastern Tennessee Seismic Zone, USA.

This dataset is composed of linear active tectonic and other relevant features (scarps, deflected drainages, and lineaments and contrasts in topography, vegetation, and ground color) mapped based on high-resolution topography, aerial/satellite imagery, and field observations. The mapping covers the area surrounding the 2019 Ridgecrest, California earthquake surface ruptures. Point locations of field observations are also included.

This dataset is composed of linear active tectonic and other relevant features (scarps, deflected drainages, and lineaments and contrasts in topography, vegetation, and ground color) mapped based on high-resolution topography, aerial/satellite imagery, and field observations. The mapping covers the area surrounding the 2019 Ridgecrest, California earthquake surface ruptures. Point locations of field observations are also included.

The following report summarizes the dating results from sedimentary deposits exposed by soil pits in Panamint Valley, CA. Within this report, we detail the methodology used by the USGS Luminescence Geochronology Laboratory to obtain ages including sample preparation methods, luminescence measurement, equivalent dose determination, and dating-related calculations.

The following report summarizes the dating results from sedimentary deposits exposed by soil pits in Panamint Valley, CA. Within this report, we detail the methodology used by the USGS Luminescence Geochronology Laboratory to obtain ages including sample preparation methods, luminescence measurement, equivalent dose determination, and dating-related calculations.

This release is an update to the online "Quaternary fault and fold database" for Washington State. The online database was last updated for Washington in 2014 – this 2020 update includes newly identified and modified traces and geometries for on-shore faults gleaned from new peer-reviewed studies and mapping of active faults within the state of Washington. These data contain lines representing the location of faults with known or suspected Quaternary (<1,600,000 yrs) activity in the state of Washington. Faults are attributed following the Quaternary fault and fold database attributes, including information such as age, slip sense, dip direction, class, and mapped scale. This data was compiled in conjunction with the Washington State Geological Survey. Significant modifications include: 1) newly mapped active traces of the Sadie Creek fault, Entiat fault system, Spencer Canyon fault system; 2) modified geometry of the Seattle fault zone; and 3) representative lines for the areas of the Mount Saint Helens seismic zone, Western Rainier seismic zone, and Goat Rocks seismic zone.

This release is an update to the online "Quaternary fault and fold database" for Washington State. The online database was last updated for Washington in 2014 – this 2020 update includes newly identified and modified traces and geometries for on-shore faults gleaned from new peer-reviewed studies and mapping of active faults within the state of Washington. These data contain lines representing the location of faults with known or suspected Quaternary (<1,600,000 yrs) activity in the state of Washington. Faults are attributed following the Quaternary fault and fold database attributes, including information such as age, slip sense, dip direction, class, and mapped scale. This data was compiled in conjunction with the Washington State Geological Survey. Significant modifications include: 1) newly mapped active traces of the Sadie Creek fault, Entiat fault system, Spencer Canyon fault system; 2) modified geometry of the Seattle fault zone; and 3) representative lines for the areas of the Mount Saint Helens seismic zone, Western Rainier seismic zone, and Goat Rocks seismic zone.

These datasets provide bedrock mapping and geochemistry, low-temperature thermochronology, remotely mapped lineaments, field observations of interpreted faults, and structure from motion models in the Pit River Region of northeastern California. The bedrock mapping datasets contain bedding orientations and field rock descriptions and associated geochemistry and 40Ar/39Ar data for a limited number of samples. Low-temperature thermochronology datasets contain (U-Th)/He measurements for two samples from the Klamath terranes. Remotely mapped lineaments, field observations of lineaments, and structure from motion models document the Quaternary-active faults in the region. Simplified fault traces for interpreted Quaternary-active faults are provided for seismic hazard studies. These datasets are associated with the manuscript: Thompson Jobe, J.A., R. Briggs, R. Gold, S. DeLong, M. Hille, J. Delano, S. A. Johnstone, A. Pickering, R. Phillips, A. T. Calvert (in review). The Pondosa fault zone: a distributed dextral-normal-oblique fault system in northeastern California.