Maureen L Walton, PhD (Former Employee)
Science and Products
Cascadia Subduction Zone Database
-a compilation of published datasets relevant to Cascadia subduction zone earthquake hazards and tectonics The following is new (2022) compilation of datasets relevant to Cascadia subduction zone earthquake hazards and tectonics useful for emergency management officials, geologists, and others interested in understanding the unique geologic dynamics that create hazards to communities in the region...
Coastal and Marine Geohazards of the U.S. West Coast and Alaska
Coastal and marine geohazards are sudden and extreme events beneath the ocean that threaten coastal populations. These underwater hazards include earthquakes, volcanic eruptions, landslides, and tsunamis. The tectonically active west coast of the Americas is prone to such hazards, as it lies along the boundaries of major tectonic plates that make up the Earth's crust—the North American, Caribbean...
By
Natural Hazards Mission Area, Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center, 3-D CT Core Imaging Laboratory, Core Preparation and Analysis Laboratory and Sample Repositories, Big Sur Landslides, Deep Sea Exploration, Mapping and Characterization, Subduction Zone Science
Filter Total Items: 13
Compiled onshore and offshore paleoseismic data along the Cascadia Subduction zone Compiled onshore and offshore paleoseismic data along the Cascadia Subduction zone
The USGS Powell Center Cascadia earthquake hazards working group compiled published onshore and offshore paleoseismic data along the Cascadia subduction zone, spanning sites from Vancouver Island to the Mendocino triple junction. Evidence for megathrust rupture includes coastal land-level change, tsunami inundation, onshore shaking proxies such as landslides or liquefaction, and offshore...
Radiocarbon age dating of biological material from cores collected off central California in 1999, 2006, and 2019 Radiocarbon age dating of biological material from cores collected off central California in 1999, 2006, and 2019
Results of radiocarbon age dating of planktic and benthic foraminifera collected from cores obtained in 1999, 2006, and 2019 offshore central California in the vicinity of Morro Bay.
Digital maps of submarine landslides and mass wasting features offshore of southern California Digital maps of submarine landslides and mass wasting features offshore of southern California
This data release provides the locations and certain key metrics of landslide features offshore southern California, including landslide perimeters, scarps, evacuation zones, debris aprons, and slide-prone areas in geographic information system (GIS) shapefile format. The offshore region of southern California is a tectonically active area that includes more than 20 fault-bounded basins...
Multichannel sparker and chirp seismic reflection data collected offshore South East Alaska during USGS Field Activity 2017-621-FA Multichannel sparker and chirp seismic reflection data collected offshore South East Alaska during USGS Field Activity 2017-621-FA
High-resolution multichannel seismic reflection data and chirp sub-bottom data were collected by the U.S. Geological Survey in July and August 2017 offshore southeast Alaska to expand data coverage along the Queen Charlotte Fault system. Data were acquired to study earthquake hazards, fault mechanics and submarine mass wasting processes along the Queen Charlotte fault system, a 1200 km...
Cascadia subduction zone database: compilation of published datasets relevant to Cascadia subduction zone earthquake hazards and tectonics (2022) Cascadia subduction zone database: compilation of published datasets relevant to Cascadia subduction zone earthquake hazards and tectonics (2022)
In this database, we compile and host several available onshore and offshore geologic, paleoseismic, geophysical, and instrumental datasets along the Cascadia subduction zone. The ScienceBase data release and downloadable map package is accompanied by an ArcGIS online map and StoryMap.
By
Natural Hazards Mission Area, Coastal and Marine Hazards and Resources Program, Earthquake Hazards Program, National Cooperative Geologic Mapping Program, Geology, Minerals, Energy, and Geophysics Science Center, Pacific Coastal and Marine Science Center, Deep Sea Exploration, Mapping and Characterization, Subduction Zone Science
Multibeam echosounder, video observation, and derived benthic habitat data offshore of south-central California in support of the Bureau of Ocean Energy Management Cal DIG I, offshore alternative energy project Multibeam echosounder, video observation, and derived benthic habitat data offshore of south-central California in support of the Bureau of Ocean Energy Management Cal DIG I, offshore alternative energy project
Coastal and Marine Ecological Classification Standard (CMECS) geoform, substrate, and biotic component (also known as "biotope") GIS products were developed for the U.S. Exclusive Economic Zone of south-central California motivated by interest in development of offshore wind energy capacity and infrastructure. The lead agency responsible for planning and leasing in the Exclusive Economic...
Colored shaded-relief bathymetry, acoustic backscatter, and selected perspective views of the northern part of the California Continental Borderland, southern California Colored shaded-relief bathymetry, acoustic backscatter, and selected perspective views of the northern part of the California Continental Borderland, southern California
The California Continental Borderland is the complex continental margin in southern California that extends from Point Conception southward into northern Baja California (Fisher and others, 2009). This colored shaded-relief bathymetry map of the northern continental borderland in southern California was generated primarily from multibeam-echosounder data collected by the University of...
Filter Total Items: 19
Pockmarks offshore Big Sur, California provide evidence for recurrent, regional, and unconfined sediment gravity flows Pockmarks offshore Big Sur, California provide evidence for recurrent, regional, and unconfined sediment gravity flows
Recent surface ship multibeam surveys of the Sur Pockmark Field, offshore Central California, reveal >5,000 pockmarks in an area that is slated to host a wind farm, between 500- and 1,500-m water depth. Extensive fieldwork was conducted to characterize the seafloor environment and its recent geologic history, including visual observations with remotely operated vehicles, sediment core...
Authors
E. Lundsten, Charles K. Paull, R. Gwiazda, S. Dobbs, D.W. Caress, Linda A. Kuhnz, M. Walton, N. Nieminski, Mary McGann, Thomas Lorenson, Guy R. Cochrane, Jason A. Addison
A comprehensive assessment of submarine landslides and mass wasting processes offshore southern California A comprehensive assessment of submarine landslides and mass wasting processes offshore southern California
It is critical to characterize submarine landslide hazards near dense coastal populations, especially in areas with active faults, which can trigger slope failure, subsequent tsunamis, and damage seabed infrastructure during earthquake shaking. Offshore southern California, numerous marine geophysical surveys have been conducted over the past decade, and high-resolution bathymetric and...
Authors
M. Walton, James E. Conrad, Antoinette Gabrielle Papesh, Daniel S. Brothers, Jared W. Kluesner, Mary McGann, Peter Dartnell
Sediment gravity flow frequency offshore central California diminished significantly following the Last Glacial Maximum Sediment gravity flow frequency offshore central California diminished significantly following the Last Glacial Maximum
A high-resolution multibeam survey from a portion of the San Simeon Channel (offshore Morro Bay, California) captured a zone of recurring troughs and ridges adjacent to prominent submarine meander bends. Through an integrated study using surveying data, sediment core analysis, radiocarbon dating, and stable isotope measurements, we hypothesize that turbidity current event frequency was...
Authors
Stephen C. Dobbs, Charles K. Paull, Eve M. Lundsten, Roberto Gwiazda, David W. Caress, Mary McGann, Marianne M. Coholich, Maureen A.L. Walton, Nora Maria Nieminski, Timothy McHargue, Steven A. Graham
Seismic evidence for magmatic underplating along the Kodiak-Bowie Seamount Chain, Gulf of Alaska Seismic evidence for magmatic underplating along the Kodiak-Bowie Seamount Chain, Gulf of Alaska
Oceanic crust formed at mid-ocean ridges may be later modified by off-ridge magmatism forming seamounts, guyots, and islands. We investigate processes associated with seamount formation in the Gulf of Alaska Seamount Province using two coincident seismic reflection/wide-angle profiles. A north-south profile crosses the Kodiak-Bowie Seamount Chain and Aja fracture zone (FZ), and an...
Authors
Gail L. Christeson, Sean P.S. Gulick, Maureen A. L. Walton, Ginger Barth
Revisiting the 1899 earthquake series using integrative geophysical analysis in Yakutat Bay, Alaska Revisiting the 1899 earthquake series using integrative geophysical analysis in Yakutat Bay, Alaska
A series of large earthquakes in 1899 affected southeastern Alaska near Yakutat and Disenchantment Bays. The largest of the series, a MW 8.2 event on 10 September 1899, generated an ~12-m-high tsunami and as much as 14.4 m of coseismic uplift in Yakutat Bay, the largest coseismic uplift ever measured. Several complex fault systems in the area are associated with the Yakutat terrane...
Authors
Maureen A. L. Walton, Sean P.S. Gulick, Peter J. Haeussler
California Deepwater Investigations and Groundtruthing (Cal DIG) I, volume 3 — Benthic habitat characterization offshore Morro Bay, California California Deepwater Investigations and Groundtruthing (Cal DIG) I, volume 3 — Benthic habitat characterization offshore Morro Bay, California
Coastal and Marine Ecological Classification Standard (CMECS) geoform, substrate, and biotic component geographic information system (GIS) products were developed for the U.S. Exclusive Economic Zone (U.S. EEZ) of south-central California in the region of Santa Lucia Bank motivated by interest in development of offshore wind-energy capacity and infrastructure. The Bureau of Ocean Energy...
Authors
Guy R. Cochrane, Linda A. Kuhnz, Lisa Gilbane, Peter Dartnell, Maureen A. L. Walton, Charles K. Paull
Non-USGS Publications**
Zurbuchen, J. M., S. P. S. Gulick, M. A. L. Walton, and J. A. Goff (2015), Imaging evidence for Hubbard Glacier advances and retreats since the last glacial maximum in Yakutat and Disenchantment Bays, Alaska, Geochem. Geophys. Geosys., 16(6), 1962-1974.
Tréhu, A. M., M. Scheidhauer, K. M. M. Rohr, B. Tikoff, M. A. L. Walton, S. P. S. Gulick, and E. Roland (2015), An abrupt transition in the mechanical response of the upper crust to transpression across the Queen Charlotte Fault, Bull. Seismol. Soc. Am., 105(2B), 1114-1128.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Cascadia subduction zone database: compilation of published datasets relevant to Cascadia subduction zone earthquake hazards and tectonics Cascadia subduction zone database: compilation of published datasets relevant to Cascadia subduction zone earthquake hazards and tectonics
As part of the USGS Powell Center working group on Cascadia earthquake hazards, we compile and host several available geologic, paleoseismic, geophysical, and instrumental datasets along the Cascadia subduction zone. The ArcGIS online map and downloadable map package include both raster images and shapefiles. In this Story Map, we outline the features and datasets compiled.
Science and Products
Cascadia Subduction Zone Database
-a compilation of published datasets relevant to Cascadia subduction zone earthquake hazards and tectonics The following is new (2022) compilation of datasets relevant to Cascadia subduction zone earthquake hazards and tectonics useful for emergency management officials, geologists, and others interested in understanding the unique geologic dynamics that create hazards to communities in the region...
Coastal and Marine Geohazards of the U.S. West Coast and Alaska
Coastal and marine geohazards are sudden and extreme events beneath the ocean that threaten coastal populations. These underwater hazards include earthquakes, volcanic eruptions, landslides, and tsunamis. The tectonically active west coast of the Americas is prone to such hazards, as it lies along the boundaries of major tectonic plates that make up the Earth's crust—the North American, Caribbean...
By
Natural Hazards Mission Area, Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center, 3-D CT Core Imaging Laboratory, Core Preparation and Analysis Laboratory and Sample Repositories, Big Sur Landslides, Deep Sea Exploration, Mapping and Characterization, Subduction Zone Science
Filter Total Items: 13
Compiled onshore and offshore paleoseismic data along the Cascadia Subduction zone Compiled onshore and offshore paleoseismic data along the Cascadia Subduction zone
The USGS Powell Center Cascadia earthquake hazards working group compiled published onshore and offshore paleoseismic data along the Cascadia subduction zone, spanning sites from Vancouver Island to the Mendocino triple junction. Evidence for megathrust rupture includes coastal land-level change, tsunami inundation, onshore shaking proxies such as landslides or liquefaction, and offshore...
Radiocarbon age dating of biological material from cores collected off central California in 1999, 2006, and 2019 Radiocarbon age dating of biological material from cores collected off central California in 1999, 2006, and 2019
Results of radiocarbon age dating of planktic and benthic foraminifera collected from cores obtained in 1999, 2006, and 2019 offshore central California in the vicinity of Morro Bay.
Digital maps of submarine landslides and mass wasting features offshore of southern California Digital maps of submarine landslides and mass wasting features offshore of southern California
This data release provides the locations and certain key metrics of landslide features offshore southern California, including landslide perimeters, scarps, evacuation zones, debris aprons, and slide-prone areas in geographic information system (GIS) shapefile format. The offshore region of southern California is a tectonically active area that includes more than 20 fault-bounded basins...
Multichannel sparker and chirp seismic reflection data collected offshore South East Alaska during USGS Field Activity 2017-621-FA Multichannel sparker and chirp seismic reflection data collected offshore South East Alaska during USGS Field Activity 2017-621-FA
High-resolution multichannel seismic reflection data and chirp sub-bottom data were collected by the U.S. Geological Survey in July and August 2017 offshore southeast Alaska to expand data coverage along the Queen Charlotte Fault system. Data were acquired to study earthquake hazards, fault mechanics and submarine mass wasting processes along the Queen Charlotte fault system, a 1200 km...
Cascadia subduction zone database: compilation of published datasets relevant to Cascadia subduction zone earthquake hazards and tectonics (2022) Cascadia subduction zone database: compilation of published datasets relevant to Cascadia subduction zone earthquake hazards and tectonics (2022)
In this database, we compile and host several available onshore and offshore geologic, paleoseismic, geophysical, and instrumental datasets along the Cascadia subduction zone. The ScienceBase data release and downloadable map package is accompanied by an ArcGIS online map and StoryMap.
By
Natural Hazards Mission Area, Coastal and Marine Hazards and Resources Program, Earthquake Hazards Program, National Cooperative Geologic Mapping Program, Geology, Minerals, Energy, and Geophysics Science Center, Pacific Coastal and Marine Science Center, Deep Sea Exploration, Mapping and Characterization, Subduction Zone Science
Multibeam echosounder, video observation, and derived benthic habitat data offshore of south-central California in support of the Bureau of Ocean Energy Management Cal DIG I, offshore alternative energy project Multibeam echosounder, video observation, and derived benthic habitat data offshore of south-central California in support of the Bureau of Ocean Energy Management Cal DIG I, offshore alternative energy project
Coastal and Marine Ecological Classification Standard (CMECS) geoform, substrate, and biotic component (also known as "biotope") GIS products were developed for the U.S. Exclusive Economic Zone of south-central California motivated by interest in development of offshore wind energy capacity and infrastructure. The lead agency responsible for planning and leasing in the Exclusive Economic...
Colored shaded-relief bathymetry, acoustic backscatter, and selected perspective views of the northern part of the California Continental Borderland, southern California Colored shaded-relief bathymetry, acoustic backscatter, and selected perspective views of the northern part of the California Continental Borderland, southern California
The California Continental Borderland is the complex continental margin in southern California that extends from Point Conception southward into northern Baja California (Fisher and others, 2009). This colored shaded-relief bathymetry map of the northern continental borderland in southern California was generated primarily from multibeam-echosounder data collected by the University of...
Filter Total Items: 19
Pockmarks offshore Big Sur, California provide evidence for recurrent, regional, and unconfined sediment gravity flows Pockmarks offshore Big Sur, California provide evidence for recurrent, regional, and unconfined sediment gravity flows
Recent surface ship multibeam surveys of the Sur Pockmark Field, offshore Central California, reveal >5,000 pockmarks in an area that is slated to host a wind farm, between 500- and 1,500-m water depth. Extensive fieldwork was conducted to characterize the seafloor environment and its recent geologic history, including visual observations with remotely operated vehicles, sediment core...
Authors
E. Lundsten, Charles K. Paull, R. Gwiazda, S. Dobbs, D.W. Caress, Linda A. Kuhnz, M. Walton, N. Nieminski, Mary McGann, Thomas Lorenson, Guy R. Cochrane, Jason A. Addison
A comprehensive assessment of submarine landslides and mass wasting processes offshore southern California A comprehensive assessment of submarine landslides and mass wasting processes offshore southern California
It is critical to characterize submarine landslide hazards near dense coastal populations, especially in areas with active faults, which can trigger slope failure, subsequent tsunamis, and damage seabed infrastructure during earthquake shaking. Offshore southern California, numerous marine geophysical surveys have been conducted over the past decade, and high-resolution bathymetric and...
Authors
M. Walton, James E. Conrad, Antoinette Gabrielle Papesh, Daniel S. Brothers, Jared W. Kluesner, Mary McGann, Peter Dartnell
Sediment gravity flow frequency offshore central California diminished significantly following the Last Glacial Maximum Sediment gravity flow frequency offshore central California diminished significantly following the Last Glacial Maximum
A high-resolution multibeam survey from a portion of the San Simeon Channel (offshore Morro Bay, California) captured a zone of recurring troughs and ridges adjacent to prominent submarine meander bends. Through an integrated study using surveying data, sediment core analysis, radiocarbon dating, and stable isotope measurements, we hypothesize that turbidity current event frequency was...
Authors
Stephen C. Dobbs, Charles K. Paull, Eve M. Lundsten, Roberto Gwiazda, David W. Caress, Mary McGann, Marianne M. Coholich, Maureen A.L. Walton, Nora Maria Nieminski, Timothy McHargue, Steven A. Graham
Seismic evidence for magmatic underplating along the Kodiak-Bowie Seamount Chain, Gulf of Alaska Seismic evidence for magmatic underplating along the Kodiak-Bowie Seamount Chain, Gulf of Alaska
Oceanic crust formed at mid-ocean ridges may be later modified by off-ridge magmatism forming seamounts, guyots, and islands. We investigate processes associated with seamount formation in the Gulf of Alaska Seamount Province using two coincident seismic reflection/wide-angle profiles. A north-south profile crosses the Kodiak-Bowie Seamount Chain and Aja fracture zone (FZ), and an...
Authors
Gail L. Christeson, Sean P.S. Gulick, Maureen A. L. Walton, Ginger Barth
Revisiting the 1899 earthquake series using integrative geophysical analysis in Yakutat Bay, Alaska Revisiting the 1899 earthquake series using integrative geophysical analysis in Yakutat Bay, Alaska
A series of large earthquakes in 1899 affected southeastern Alaska near Yakutat and Disenchantment Bays. The largest of the series, a MW 8.2 event on 10 September 1899, generated an ~12-m-high tsunami and as much as 14.4 m of coseismic uplift in Yakutat Bay, the largest coseismic uplift ever measured. Several complex fault systems in the area are associated with the Yakutat terrane...
Authors
Maureen A. L. Walton, Sean P.S. Gulick, Peter J. Haeussler
California Deepwater Investigations and Groundtruthing (Cal DIG) I, volume 3 — Benthic habitat characterization offshore Morro Bay, California California Deepwater Investigations and Groundtruthing (Cal DIG) I, volume 3 — Benthic habitat characterization offshore Morro Bay, California
Coastal and Marine Ecological Classification Standard (CMECS) geoform, substrate, and biotic component geographic information system (GIS) products were developed for the U.S. Exclusive Economic Zone (U.S. EEZ) of south-central California in the region of Santa Lucia Bank motivated by interest in development of offshore wind-energy capacity and infrastructure. The Bureau of Ocean Energy...
Authors
Guy R. Cochrane, Linda A. Kuhnz, Lisa Gilbane, Peter Dartnell, Maureen A. L. Walton, Charles K. Paull
Non-USGS Publications**
Zurbuchen, J. M., S. P. S. Gulick, M. A. L. Walton, and J. A. Goff (2015), Imaging evidence for Hubbard Glacier advances and retreats since the last glacial maximum in Yakutat and Disenchantment Bays, Alaska, Geochem. Geophys. Geosys., 16(6), 1962-1974.
Tréhu, A. M., M. Scheidhauer, K. M. M. Rohr, B. Tikoff, M. A. L. Walton, S. P. S. Gulick, and E. Roland (2015), An abrupt transition in the mechanical response of the upper crust to transpression across the Queen Charlotte Fault, Bull. Seismol. Soc. Am., 105(2B), 1114-1128.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Cascadia subduction zone database: compilation of published datasets relevant to Cascadia subduction zone earthquake hazards and tectonics Cascadia subduction zone database: compilation of published datasets relevant to Cascadia subduction zone earthquake hazards and tectonics
As part of the USGS Powell Center working group on Cascadia earthquake hazards, we compile and host several available geologic, paleoseismic, geophysical, and instrumental datasets along the Cascadia subduction zone. The ArcGIS online map and downloadable map package include both raster images and shapefiles. In this Story Map, we outline the features and datasets compiled.