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Title: 230Th/U ages Supporting Hanford Site-Wide Probabilistic Seismic Hazard Analysis

This product represents a USGS Administrative Report that discusses samples and methods used to conduct uranium-series isotope analyses and resulting ages and initial 234U/238U activity ratios of pedogenic cements developed in several different surfaces in the Hanford area middle to late Pleistocene. Samples were collected and dated to provide calibration of soil development in surface deposits that are being used in the Hanford Site-Wide probabilistic seismic hazard analysis conducted by AMEC. The report includes description of sample locations and physical characteristics, sample preparation, chemical processing and mass spectrometry, analytical results, and calculated ages for individual sites. Ages of innermost rinds on a number of samples from five sites in eastern Washington are consistent with a range of minimum depositional ages from 17 ka for cataclysmic flood deposits to greater than 500 ka for alluvium at several sites.
  1. U.S. Geological Survey
Publication Date:
OSTI Identifier:
Report Number(s):
PNNL #204780
DOE Contract Number:
Resource Type:
Technical Report
Research Org:
U.S. Geological Survey
Sponsoring Org:
USDOE; USDOE Office of Environmental Management (EM)
Contributing Orgs:
U.S. Geological Survey
Country of Publication:
United States
58 GEOSCIENCES U-series dating; pedogenic carbonate; Pleistocene surface deposits; paleoseismic; alluvium