Person

Robert C Witter

Research Geologist

Alaska Science Center

Email: rwitter@usgs.gov
Office Phone: 907-786-7404
Fax: 907-786-7401
ORCID: 0000-0002-1721-254X

Location
Glenn Olds Hall
4210 University Drive
Anchorage , AK 99508-4626
US

Supervisor: James V Jones

9 items:

Radiocarbon Data from Coastal Environments on Montague Island, Alaska This dataset consists of sample descriptions and radiocarbon age data from coastal environments on Montague Island, Alaska, analyzed at the National Ocean Sciences Accelerator Mass Spectrometry Facility. Categories: Data; Tags: Alaska, Biota, Carbon-14 analysis, Coastal processes, Earth science, All tags...
Radiocarbon ages, age-model code, and other supplemental data for Nelson et al. (2021), A maximum rupture model for the central and southern Cascadia subduction zone—assessing ages for coastal evidence of megathrust earthquakes and tsunamis This data release contains supplemental data for the following paper: Nelson, A.R., DuRoss, C.B., Mahan, S.A., Gray, H.J., Engelhart, S.E., Witter, R.C., Hawkes, A.D., Horton, B.P., Kelsey, H.M., and Padgett, J.S., 2021, A maximum rupture model for the central and southern Cascadia subduction zone—assessing ages for coastal evidence of megathrust earthquakes and tsunamis: Quaternary Science Reviews 261, https://doi.org/10.1016/j.quascirev.2021.106922. The data include a compilation of new and previously published radiocarbon ages from the original cores from Bradley Lake of Kelsey et al. (2005; odt format), and tables of new and previously published radiocarbon data for 7 of the 13 tidal wetland sites along the... Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Cascadia Megathrust, Cascadia subduction zone, Earthquake Hazard Program, GHSC, Geologic Hazards Science Center, All tags...
Quaternary deposits of the 9-county San Francisco Bay Region: an areally continuous digital map database prepared from Knudsen and others (2000) and Witter and others (2006) This digital map database provides an areally continuous representation of the Quaternary surficial deposits of the San Francisco Bay region merged from the database files from Knudsen and others (2000) and Witter and others (2006). The more detailed mapping by Witter and others (2006) of the inner part of the region (compiled at a scale of 1:24,000), is given precedence over the less detailed mapping by Knudsen and others (2000) of the outer part of the area (compiled at a scale of 1:100,000). The Quaternary map database is accompanied by a list of the map-unit names represented by polygon identities, a digital map index of the 1:24,000-scale topographic quadrangles of the region, and a figure illustrating the... Tags: 1800s shoreline, Geomorphology, Quaternary, San Francisco Bay Region, San Francisco Bay Region, All tags...
Diatom Data from Coastal Environments on Montague Island, Alaska This dataset consists of fossil diatom counts from sediment cores collected in coastal environments on Montague Island, Alaska, and analyzed at Virginia Tech University. Categories: Data; Tags: Alaska, Biota, Diatoms, Drilling and coring, Geology, All tags...
Field reconnaissance of ground failure triggered by shaking during the 2018 M7.1 Anchorage, Alaska, earthquake These data present geolocated photographs, GPS tracks, and field-mapped ground failures collected during the USGS reconnaissance of ground failures following the 2018 M7.1 Anchorage Earthquake. Tags: Alaska, Anchorage, Geomorphology, Landslides, Liquefaction, All tags...

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