Radiocarbon dates, stratigraphic sections, and sample location data for samples collected at Pavlof Volcano and vicinity, Alaska

Waythomas, C.F.Izbekov, P.E.Larsen, J.F.Mulliken, K.M.Wasser, V.K.2026Radiocarbon dates, stratigraphic sections, and sample location data for samples collected at Pavlof Volcano and vicinity, AlaskaspreadsheetRaw Data FileRDF 2025-26Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys30 p.https://doi.org/10.14509/31733Radiocarbon dates, stratigraphic sections, and sample location data for samples collected at Pavlof Volcano and vicinity, Alaska, Raw Data File 2025-26, presents the results of radiocarbon dating and stratigraphic studies of volcanic ash deposits in the area around Pavlof Volcano, Alaska. We collected samples for radiocarbon dating during 10-day-long field excursions to the area in 2017-2022. In addition to collecting soil-organic matter samples for dating, we recorded stratigraphic profiles in field notebooks and documented them with digital photographs. The goal of this work is to establish the stratigraphic framework of tephra-fall deposits from Pavlof Volcano to aid in documenting the Holocene eruptive history of the volcano as recorded by the tephra deposits. These data consist of a .csv file, annotated photographs, and line drawings of stratigraphic profiles. These data are provided as a Raw Data File under an open end-user license and are available on the DGGS website: http://doi.org/10.14509/31733.We establish the stratigraphic framework of tephra-fall deposits from Pavlof Volcano to document its Holocene eruptive history. By reconstructing past eruptions, we improve the basis for assessing future volcanic hazards in Alaska.>Analytical data: Table of field locations, sample metadata, radiocarbon measurements, calibrated ages, analytical details, and an accompanying data dictionary.20172025ground conditionCompleteNone planned-162.514955-161.71198055.79540055.117220ISO 19115 Topic CategorygeoscientificInformationAlaska Division of Geological & Geophysical SurveysActive VolcanoesAnalysesAnalyses and SamplingAnalytical Lab ResultsAshfallCoastalCoastal and RiverDGGSEolianGeologicGeologyHazardsMethodsPeatRadiocarbon AgesRadiocarbon DatingSample LocationStratigraphySurfaceSurficialTephraTephrostratigraphyVolcanicVolcanic AshVolcanic DepositsVolcanic EruptionVolcanic RocksVolcaniclasticVolcaniclastic DepositsVolcaniclasticsVolcanoesVolcanologyAlaska Division of Geological & Geophysical SurveysBear BayBelkofski BayBering SeaBristol BayHerendeen BayPacific OceanPavlof SisterPavlof VolcanoTrader MountainWalker, J.D., Geissman, J.W., Bowring, S.A, and Babcock, L.E., comp., 2012, Geologic Time Scale v. 4.0: Geological Society of AmericaHoloceneThis report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.Alaska Division of Geological & Geophysical SurveysMetadata Managermailing and physical

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FairbanksAK99709-3707USA(907)451-5020(907)451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysPlease view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.This report is based on work supported by the U.S. Geological Survey in a cooperative agreement with the University of Alaska Fairbanks Geophysical Institute and under Cooperative Agreement No. G22AC00137 with the Alaska Division of Geological & Geophysical Surveys. Radiocarbon ages were determined by the University of Georgia Center for Applied Isotope Studies under contract to the U.S. Geological Survey Alaska Volcano Observatory. Lodging provided by Mary Martin at the Cold Bay Lodge in Cold Bay, Alaska, was greatly appreciated. Maritime Helicopters and Egli Air Haul. Pilots Jared Berman and Sam Egli provided efficient, safe, and professional transportation in the field areas.Cameron, C.E.Schaefer, J.R.2016Historically active volcanoes of AlaskaDigital Data SeriesDDS 6Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveyshttps://doi.org/10.14509/27061Cameron, C.E.Snedigar, S.F.2016Alaska Volcano Observatory image databaseDigital Data SeriesDDS 13Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveyshttps://doi.org/10.14509/29689Cameron, C.E.Bull, K.F.Macpherson, A.E.2023Recently active volcanoes of AlaskaMiscellaneous PublicationMP 133 v. 6Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys2 sheetshttps://doi.org/10.14509/31086Cameron, C.E.Crass, S.W.AVO Staff2022Geologic Database of Information on Volcanoes in Alaska (GeoDIVA)Digital Data SeriesDDS 20Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveyshttps://doi.org/10.14509/30901Cameron, C.E.Mulliken, K.M.Crass, S.W.Schaefer, J.R.Wallace, K.L.2019Alaska Volcano Observatory geochemical database, version 2Digital Data SeriesDDS 8 v. 2Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys22 phttps://doi.org/10.14509/30058Cameron, C.E.Triplehorn, J.H.Robar, C.L.2003Bibliography of information on Alaska volcanoesMiscellaneous PublicationMP 131Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveyshttps://doi.org/10.14509/2880Mulliken, K.M.2018The Volcanology section at DGGSInformation CircularIC 74Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys2 phttps://doi.org/10.14509/30118The accompanying report and data tables provide a comprehensive discussion of processing methods, with errors reported in the tables where applicable. This data is being released as part of the DGGS RDF series, which includes content describing approved techniques and methods for the collection, storage, visualization, analysis, and interpretation of scientific data. While the information has been reviewed by several geologists familiar with the study area, the data and report have not undergone formal review for technical content or conformity to DGGS editorial standards. For inquiries regarding analytical values or procedures, the originating lab is the best point of contact.Not applicableThis data release is complete.Sample site locations were determined with hand-held GPS devices and recorded in field notebooks. Data are provided in NAD83 datum.Field data collection - Stratigraphic profiles were selected for study in the field. They consisted of natural stream bank exposures or hand-dug pits. We scraped exposure surfaces clean with shovels and trowels to better expose the tephra deposits and associated buried soils, recorded the apparent vertical thickness of each unit, and collected samples of tephra and soil-organic matter for later analysis.2022Sample analysis - Researchers collected buried soil samples from 26 sites beneath major tephra layers, then dried and prepared them before sending them to the University of Georgia's Center for Applied Isotope Studies for radiocarbon analysis. In the lab, humic acids were isolated from the soils through sieving, acid treatment, alkaline extraction, precipitation, and drying, while peat samples underwent a similar cleaning process before combustion. Radiocarbon measurements were obtained using accelerator mass spectrometry, with isotopic ratios corrected for natural fractionation. Results were reported as percent modern carbon and as radiocarbon years before present (BP), based on a 5,568-year half-life. These uncalibrated dates were then converted to calendar ages using the CALIB 7.1 calibration program, which relies on tree-ring and other independently dated records. Final calibrated ages are expressed as cal BC, cal AD, or cal BP, corresponding directly to actual calendar years. Additional methodological detail and full analytical results are provided in the accompanying report.2023point0.00000010.0000001decimal degreesWGS84WGS 846378137298.257223563RDF2025-26_pavlof-c14-data.csv, RDF2025-26_pavlof-c14-data-dictionary.csvTable of field locations, sample metadata, radiocarbon measurements, calibrated ages, analytical details, and an accompanying data dictionary.DGGSAnalytical dataAlaska Division of Geological & Geophysical SurveysMetadata Managermailing and physical

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FairbanksAK99709-3707USA(907)451-5020(907)451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysFGDC Content Standard for Digital Geospatial MetadataFGDC-STD-001-1998If the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the Alaska Department of Natural Resources or Division of Geological & Geophysical Surveys.https://dggs.alaska.gov/metadata/dggs.extdggs metadata extensions