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Jonathan Stock (Former Employee)

Science and Products

Filter Total Items: 14
rainbow

Interagency Postdoctoral Fellowship Opportunity

In fall of 2018, USGS and NASA launched an interagency postdoctoral fellowship. This jointly-funded pilot program will bring researchers to Silicon Valley to explore the application of cutting edge science and technology to some of our Nation's biggest challenges.
By
National Innovation Center
Interagency Postdoctoral Fellowship Opportunity

Interagency Postdoctoral Fellowship Opportunity

In fall of 2018, USGS and NASA launched an interagency postdoctoral fellowship. This jointly-funded pilot program will bring researchers to Silicon Valley to explore the application of cutting edge science and technology to some of our Nation's biggest challenges.
Learn More
A soil landslide scar above a neighborhood of houses.

Rainfall and Landslides in Northern California

A summary of recent and past landslides and debris flows caused by rainfall in northern California, and links to current shallow landslide monitoring.
By
Natural Hazards Mission Area, Landslide Hazards Program, Geologic Hazards Science Center, Big Sur Landslides
Rainfall and Landslides in Northern California

Rainfall and Landslides in Northern California

A summary of recent and past landslides and debris flows caused by rainfall in northern California, and links to current shallow landslide monitoring.
Learn More
No Result Found
No results found.
Filter Total Items: 24

From ridge to reef—linking erosion and changing watersheds to impacts on the coral reef ecosystems of Hawai‘i and the Pacific Ocean From ridge to reef—linking erosion and changing watersheds to impacts on the coral reef ecosystems of Hawai‘i and the Pacific Ocean

Coral reef ecosystems are threatened by unprecedented watershed changes in the United States and worldwide. These ecosystems sustain fishing and tourism industries essential to the economic survival of many communities. Sediment, nutrients, and pollutants from watersheds are increasingly transported to coastal waters, where these contaminants damage corals. Although pollution from...
Authors
Jonathan D. Stock, Susan A. Cochran, Michael E. Field, James D. Jacobi, Gordon Tribble
By
Ecosystems Mission Area, Pacific Island Ecosystems Research Center, Pacific Coastal and Marine Science Center

Spatially explicit shallow landslide susceptibility mapping over large areas Spatially explicit shallow landslide susceptibility mapping over large areas

Recent advances in downscaling climate model precipitation predictions now yield spatially explicit patterns of rainfall that could be used to estimate shallow landslide susceptibility over large areas. In California, the United States Geological Survey is exploring community emergency response to the possible effects of a very large simulated storm event and to do so it has generated...
Authors
Dino Bellugi, William E. Dietrich, Jonathan D. Stock, Jim McKean, Brian Kazian, Paul Hargrove
By
Geology, Energy, and Minerals Mission Area, Natural Hazards Mission Area, Energy Resources Program, Groundwater and Streamflow Information Program, Landslide Hazards Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geologic Hazards Science Center, Geology, Minerals, Energy, and Geophysics Science Center

Hydrologic conditions and terrestrial laser scanning of post-fire debris flows in the San Gabriel Mountains, CA, U.S.A. Hydrologic conditions and terrestrial laser scanning of post-fire debris flows in the San Gabriel Mountains, CA, U.S.A.

To investigate rainfall-runoff conditions that generate post-wildfire debris flows, we instrumented and surveyed steep, small watersheds along the tectonically active front of the San Gabriel Mountains, California. Fortuitously, we recorded runoff-generated debris-flows triggered by one spatially restricted convective event with 28 mm of rainfall falling over 62 minutes. Our rain gages...
Authors
Kevin M. Schmidt, M. N. Hanshaw, James F. Howle, Jason W. Kean, Dennis M. Staley, Jonathan D. Stock, Gerald W. Bawden
By
Geology, Energy, and Minerals Mission Area, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Groundwater and Streamflow Information Program, Geology, Minerals, Energy, and Geophysics Science Center

Overview of the ARkStorm scenario Overview of the ARkStorm scenario

The U.S. Geological Survey, Multi Hazards Demonstration Project (MHDP) uses hazards science to improve resiliency of communities to natural disasters including earthquakes, tsunamis, wildfires, landslides, floods and coastal erosion. The project engages emergency planners, businesses, universities, government agencies, and others in preparing for major natural disasters. The project also...
Authors
Keith Porter, Anne Wein, Charles N. Alpers, Allan Baez, Patrick L. Barnard, James Carter, Alessandra Corsi, James Costner, Dale Cox, Tapash Das, Mike Dettinger, James Done, Charles Eadie, Marcia Eymann, Justin Ferris, Prasad Gunturi, Mimi Hughes, Robert Jarrett, Laurie Johnson, Hanh Dam Le-Griffin, David Mitchell, Suzette Morman, Paul Neiman, Anna Olsen, Suzanne Perry, Geoffrey Plumlee, Martin Ralph, David Reynolds, Adam Rose, Kathleen Schaefer, Julie Serakos, William Siembieda, Jonathan D. Stock, David Strong, Ian Sue Wing, Alex Tang, Pete Thomas, Ken Topping, Chris Wills, Lucile Jones
By
Natural Hazards Mission Area, Coastal and Marine Hazards and Resources Program, Earthquake Hazards Program, Science Application for Risk Reduction, Geologic Hazards Science Center, Pacific Coastal and Marine Science Center, Big Sur Landslides, Reducing Risk, San Francisco Bay and Sacramento-San Joaquin Delta Estuary

Coral Ba/Ca records of sediment input to the fringing reef of the southshore of Moloka'i, Hawai'i over the last several decades Coral Ba/Ca records of sediment input to the fringing reef of the southshore of Moloka'i, Hawai'i over the last several decades

The fringing reef of southern Moloka’i is perceived to be in decline because of land-based pollution. In the absence of historical records of sediment pollution, ratios of coral Ba/Ca were used to test the hypothesis that sedimentation has increased over time. Baseline Ba/Ca ratios co-vary with the abundance of red, terrigenous sediment visible in recent imagery. The highest values at...
Authors
N.G. Prouty, M.E. Field, J. D. Stock, S.D. Jupiter, M. McCulloch
By
Pacific Coastal and Marine Science Center, Pacific Islands Water Science Center

Rapid measurement of field-saturated hydraulic conductivity for areal characterization Rapid measurement of field-saturated hydraulic conductivity for areal characterization

To provide an improved methodology for characterizing the field‐saturated hydraulic conductivity (Kfs) over broad areas with extreme spatial variability and ordinary limitations of time and resources, we developed and tested a simplified apparatus and procedure, correcting mathematically for the major deficiencies of the simplified implementation. The methodology includes use of a...
Authors
J. R. Nimmo, K. M. Schmidt, K. S. Perkins, J. D. Stock
By
Geology, Minerals, Energy, and Geophysics Science Center

Hydrologic characterization of desert soils with varying degrees of pedogenesis: 1. field experiments evaluating plant-relevant soil water behavior Hydrologic characterization of desert soils with varying degrees of pedogenesis: 1. field experiments evaluating plant-relevant soil water behavior

To assess the eff ect of pedogenesis on the soil moisture dynamics infl uencing the character and quality of ecological habitat, we conducted infi ltration and redistribution experiments on three alluvial deposits in the Mojave National Preserve: (i) recently deposited active wash sediments, (ii) a soil of early Holocene age, and (iii) a highly developed soil of late Pleistocene age. At...
Authors
John R. Nimmo, Kim S. Perkins, Kevin M. Schmidt, David M. Miller, Jonathan D. Stock, Kamini Singha
By
Geology, Minerals, Energy, and Geophysics Science Center

Controls on alluvial fan long-profiles Controls on alluvial fan long-profiles

Water and debris flows exiting confined valleys have a tendency to deposit sediment on steep fans. On alluvial fans where water transport of gravel predominates, channel slopes tend to decrease downfan from ~0.10–0.04 to ~0.01 across wide ranges of climate and tectonism. Some have argued that this pattern reflects grain-size fining downfan such that higher threshold slopes are required...
Authors
J. D. Stock, K. M. Schmidt, D. M. Miller
By
Geology, Minerals, Energy, and Geophysics Science Center

Erosion of steepland valleys by debris flows Erosion of steepland valleys by debris flows

Episodic debris flows scour the rock beds of many steepland valleys. Along recent debris-flow runout paths in the western United States, we have observed evidence for bedrock lowering, primarily by the impact of large particles entrained in debris flows. This evidence may persist to the point at which debris-flow deposition occurs, commonly at slopes of less than ???0.03-0.10. We find...
Authors
J. D. Stock, W. E. Dietrich

Field measurements of incision rates following bedrock exposure: Implications for process controls on the long profiles of valleys cut by rivers and debris flows Field measurements of incision rates following bedrock exposure: Implications for process controls on the long profiles of valleys cut by rivers and debris flows

Until recently, published rates of incision of bedrock valleys came from indirect dating of incised surfaces. A small but growing literature based on direct measurement reports short-term bedrock lowering at geologically unsustainable rates. We report observations of bedrock lowering from erosion pins monitored over 1–7 yr in 10 valleys that cut indurated volcanic and sedimentary rocks...
Authors
Jonathan D. Stock, David R. Montgomery, Brian D. Collins, William E. Dietrich, Leonard Sklar

Shallow landsliding, root reinforcement, and the spatial distribution of trees in the Oregon Coast Range Shallow landsliding, root reinforcement, and the spatial distribution of trees in the Oregon Coast Range

The influence of root reinforcement on shallow landsliding has been well established through mechanistic and empirical studies, yet few studies have examined how local vegetative patterns influence slope stability. Because root networks spread outward from trees, the species, size, and spacing of trees should influence the spatial distribution of root strength. We documented the...
Authors
J. J. Roering, K. M. Schmidt, J. D. Stock, W. E. Dietrich, D. R. Montgomery
By
Geology, Minerals, Energy, and Geophysics Science Center

The variability of root cohesion as an influence on shallow landslide susceptibility in the Oregon Coast Range The variability of root cohesion as an influence on shallow landslide susceptibility in the Oregon Coast Range

Decades of quantitative measurement indicate that roots can mechanically reinforce shallow soils in forested landscapes. Forests, however, have variations in vegetation species and age which can dominate the local stability of landslide-initiation sites. To assess the influence of this variability on root cohesion we examined scarps of landslides triggered during large storms in February...
Authors
K. M. Schmidt, J. J. Roering, J. D. Stock, W. E. Dietrich, D. R. Montgomery, T. Schaub
By
Natural Hazards Mission Area, Landslide Hazards Program, Geologic Hazards Science Center, Geology, Minerals, Energy, and Geophysics Science Center

Science and Products

Filter Total Items: 14
rainbow

Interagency Postdoctoral Fellowship Opportunity

In fall of 2018, USGS and NASA launched an interagency postdoctoral fellowship. This jointly-funded pilot program will bring researchers to Silicon Valley to explore the application of cutting edge science and technology to some of our Nation's biggest challenges.
By
National Innovation Center
Interagency Postdoctoral Fellowship Opportunity

Interagency Postdoctoral Fellowship Opportunity

In fall of 2018, USGS and NASA launched an interagency postdoctoral fellowship. This jointly-funded pilot program will bring researchers to Silicon Valley to explore the application of cutting edge science and technology to some of our Nation's biggest challenges.
Learn More
A soil landslide scar above a neighborhood of houses.

Rainfall and Landslides in Northern California

A summary of recent and past landslides and debris flows caused by rainfall in northern California, and links to current shallow landslide monitoring.
By
Natural Hazards Mission Area, Landslide Hazards Program, Geologic Hazards Science Center, Big Sur Landslides
Rainfall and Landslides in Northern California

Rainfall and Landslides in Northern California

A summary of recent and past landslides and debris flows caused by rainfall in northern California, and links to current shallow landslide monitoring.
Learn More
No Result Found
No results found.
Filter Total Items: 24

From ridge to reef—linking erosion and changing watersheds to impacts on the coral reef ecosystems of Hawai‘i and the Pacific Ocean From ridge to reef—linking erosion and changing watersheds to impacts on the coral reef ecosystems of Hawai‘i and the Pacific Ocean

Coral reef ecosystems are threatened by unprecedented watershed changes in the United States and worldwide. These ecosystems sustain fishing and tourism industries essential to the economic survival of many communities. Sediment, nutrients, and pollutants from watersheds are increasingly transported to coastal waters, where these contaminants damage corals. Although pollution from...
Authors
Jonathan D. Stock, Susan A. Cochran, Michael E. Field, James D. Jacobi, Gordon Tribble
By
Ecosystems Mission Area, Pacific Island Ecosystems Research Center, Pacific Coastal and Marine Science Center

Spatially explicit shallow landslide susceptibility mapping over large areas Spatially explicit shallow landslide susceptibility mapping over large areas

Recent advances in downscaling climate model precipitation predictions now yield spatially explicit patterns of rainfall that could be used to estimate shallow landslide susceptibility over large areas. In California, the United States Geological Survey is exploring community emergency response to the possible effects of a very large simulated storm event and to do so it has generated...
Authors
Dino Bellugi, William E. Dietrich, Jonathan D. Stock, Jim McKean, Brian Kazian, Paul Hargrove
By
Geology, Energy, and Minerals Mission Area, Natural Hazards Mission Area, Energy Resources Program, Groundwater and Streamflow Information Program, Landslide Hazards Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geologic Hazards Science Center, Geology, Minerals, Energy, and Geophysics Science Center

Hydrologic conditions and terrestrial laser scanning of post-fire debris flows in the San Gabriel Mountains, CA, U.S.A. Hydrologic conditions and terrestrial laser scanning of post-fire debris flows in the San Gabriel Mountains, CA, U.S.A.

To investigate rainfall-runoff conditions that generate post-wildfire debris flows, we instrumented and surveyed steep, small watersheds along the tectonically active front of the San Gabriel Mountains, California. Fortuitously, we recorded runoff-generated debris-flows triggered by one spatially restricted convective event with 28 mm of rainfall falling over 62 minutes. Our rain gages...
Authors
Kevin M. Schmidt, M. N. Hanshaw, James F. Howle, Jason W. Kean, Dennis M. Staley, Jonathan D. Stock, Gerald W. Bawden
By
Geology, Energy, and Minerals Mission Area, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Groundwater and Streamflow Information Program, Geology, Minerals, Energy, and Geophysics Science Center

Overview of the ARkStorm scenario Overview of the ARkStorm scenario

The U.S. Geological Survey, Multi Hazards Demonstration Project (MHDP) uses hazards science to improve resiliency of communities to natural disasters including earthquakes, tsunamis, wildfires, landslides, floods and coastal erosion. The project engages emergency planners, businesses, universities, government agencies, and others in preparing for major natural disasters. The project also...
Authors
Keith Porter, Anne Wein, Charles N. Alpers, Allan Baez, Patrick L. Barnard, James Carter, Alessandra Corsi, James Costner, Dale Cox, Tapash Das, Mike Dettinger, James Done, Charles Eadie, Marcia Eymann, Justin Ferris, Prasad Gunturi, Mimi Hughes, Robert Jarrett, Laurie Johnson, Hanh Dam Le-Griffin, David Mitchell, Suzette Morman, Paul Neiman, Anna Olsen, Suzanne Perry, Geoffrey Plumlee, Martin Ralph, David Reynolds, Adam Rose, Kathleen Schaefer, Julie Serakos, William Siembieda, Jonathan D. Stock, David Strong, Ian Sue Wing, Alex Tang, Pete Thomas, Ken Topping, Chris Wills, Lucile Jones
By
Natural Hazards Mission Area, Coastal and Marine Hazards and Resources Program, Earthquake Hazards Program, Science Application for Risk Reduction, Geologic Hazards Science Center, Pacific Coastal and Marine Science Center, Big Sur Landslides, Reducing Risk, San Francisco Bay and Sacramento-San Joaquin Delta Estuary

Coral Ba/Ca records of sediment input to the fringing reef of the southshore of Moloka'i, Hawai'i over the last several decades Coral Ba/Ca records of sediment input to the fringing reef of the southshore of Moloka'i, Hawai'i over the last several decades

The fringing reef of southern Moloka’i is perceived to be in decline because of land-based pollution. In the absence of historical records of sediment pollution, ratios of coral Ba/Ca were used to test the hypothesis that sedimentation has increased over time. Baseline Ba/Ca ratios co-vary with the abundance of red, terrigenous sediment visible in recent imagery. The highest values at...
Authors
N.G. Prouty, M.E. Field, J. D. Stock, S.D. Jupiter, M. McCulloch
By
Pacific Coastal and Marine Science Center, Pacific Islands Water Science Center

Rapid measurement of field-saturated hydraulic conductivity for areal characterization Rapid measurement of field-saturated hydraulic conductivity for areal characterization

To provide an improved methodology for characterizing the field‐saturated hydraulic conductivity (Kfs) over broad areas with extreme spatial variability and ordinary limitations of time and resources, we developed and tested a simplified apparatus and procedure, correcting mathematically for the major deficiencies of the simplified implementation. The methodology includes use of a...
Authors
J. R. Nimmo, K. M. Schmidt, K. S. Perkins, J. D. Stock
By
Geology, Minerals, Energy, and Geophysics Science Center

Hydrologic characterization of desert soils with varying degrees of pedogenesis: 1. field experiments evaluating plant-relevant soil water behavior Hydrologic characterization of desert soils with varying degrees of pedogenesis: 1. field experiments evaluating plant-relevant soil water behavior

To assess the eff ect of pedogenesis on the soil moisture dynamics infl uencing the character and quality of ecological habitat, we conducted infi ltration and redistribution experiments on three alluvial deposits in the Mojave National Preserve: (i) recently deposited active wash sediments, (ii) a soil of early Holocene age, and (iii) a highly developed soil of late Pleistocene age. At...
Authors
John R. Nimmo, Kim S. Perkins, Kevin M. Schmidt, David M. Miller, Jonathan D. Stock, Kamini Singha
By
Geology, Minerals, Energy, and Geophysics Science Center

Controls on alluvial fan long-profiles Controls on alluvial fan long-profiles

Water and debris flows exiting confined valleys have a tendency to deposit sediment on steep fans. On alluvial fans where water transport of gravel predominates, channel slopes tend to decrease downfan from ~0.10–0.04 to ~0.01 across wide ranges of climate and tectonism. Some have argued that this pattern reflects grain-size fining downfan such that higher threshold slopes are required...
Authors
J. D. Stock, K. M. Schmidt, D. M. Miller
By
Geology, Minerals, Energy, and Geophysics Science Center

Erosion of steepland valleys by debris flows Erosion of steepland valleys by debris flows

Episodic debris flows scour the rock beds of many steepland valleys. Along recent debris-flow runout paths in the western United States, we have observed evidence for bedrock lowering, primarily by the impact of large particles entrained in debris flows. This evidence may persist to the point at which debris-flow deposition occurs, commonly at slopes of less than ???0.03-0.10. We find...
Authors
J. D. Stock, W. E. Dietrich

Field measurements of incision rates following bedrock exposure: Implications for process controls on the long profiles of valleys cut by rivers and debris flows Field measurements of incision rates following bedrock exposure: Implications for process controls on the long profiles of valleys cut by rivers and debris flows

Until recently, published rates of incision of bedrock valleys came from indirect dating of incised surfaces. A small but growing literature based on direct measurement reports short-term bedrock lowering at geologically unsustainable rates. We report observations of bedrock lowering from erosion pins monitored over 1–7 yr in 10 valleys that cut indurated volcanic and sedimentary rocks...
Authors
Jonathan D. Stock, David R. Montgomery, Brian D. Collins, William E. Dietrich, Leonard Sklar

Shallow landsliding, root reinforcement, and the spatial distribution of trees in the Oregon Coast Range Shallow landsliding, root reinforcement, and the spatial distribution of trees in the Oregon Coast Range

The influence of root reinforcement on shallow landsliding has been well established through mechanistic and empirical studies, yet few studies have examined how local vegetative patterns influence slope stability. Because root networks spread outward from trees, the species, size, and spacing of trees should influence the spatial distribution of root strength. We documented the...
Authors
J. J. Roering, K. M. Schmidt, J. D. Stock, W. E. Dietrich, D. R. Montgomery
By
Geology, Minerals, Energy, and Geophysics Science Center

The variability of root cohesion as an influence on shallow landslide susceptibility in the Oregon Coast Range The variability of root cohesion as an influence on shallow landslide susceptibility in the Oregon Coast Range

Decades of quantitative measurement indicate that roots can mechanically reinforce shallow soils in forested landscapes. Forests, however, have variations in vegetation species and age which can dominate the local stability of landslide-initiation sites. To assess the influence of this variability on root cohesion we examined scarps of landslides triggered during large storms in February...
Authors
K. M. Schmidt, J. J. Roering, J. D. Stock, W. E. Dietrich, D. R. Montgomery, T. Schaub
By
Natural Hazards Mission Area, Landslide Hazards Program, Geologic Hazards Science Center, Geology, Minerals, Energy, and Geophysics Science Center
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