What is it about?
In this study, we examine volcanic ash (tephra) found in core samples from below the Sacramento-San Joaquin Delta, California. We present an interdisciplinary interpretation of volcanic ash (tephra) age paired with fluvial depositional processes. The Pleistocene tephra are sourced from the Cascades area and include the Rockland ash bed, the Loleta ash bed, the Wildcat Grade ash, and the dacitic ash of Hood.
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Why is it important?
The Sacramento-San Joaquin Delta is a critical confluence of California’s freshwater resources, people, ecosystems, and potential geohazards (such as earthquakes). Our study provides information about time (chronostratigraphy) buried below the Delta that can be used as a basis for future geologic interpretations, including seismic hazard assessment.
Perspectives
I conducted this research study with USGS and the California Department of Water Resources as part of my Mendenhall Postdoctoral Fellowship with the USGS Earthquake Science Center in Menlo Park, California. What a great opportunity to collaborate with innovative scientists across state and federal agencies and between Science Centers at USGS Menlo Park! Also, check out the Geologic Logs Cores from the Sacramento-San Joaquin Delta in the USGS Open-File Report: https://goo.gl/soioZq
Katherine L Maier
Read the Original
This page is a summary of: Quaternary Tephrochronology and Deposition in the Subsurface Sacramento–San Joaquin Delta, California, U.S.A., Quaternary Research, March 2015, Cambridge University Press,
DOI: 10.1016/j.yqres.2014.12.007.
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