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Santa Cruz Core Splitting Laboratory

Learn about the Core Splitting Lab at the USGS Pacific Coastal and Marine Science Center in Santa Cruz, California.

In the Core Splitting Lab we have a Geotek core splitter, shrink wrap system, and a wide assortment of sampling tools and balances for core sample preparation and analysis. Additionally, we have a microscope workstation available for dissection of sediment samples, microfossil analysis, and/or selecting organic material for radiocarbon sample preparation.

In this lab, aluminum-lined cores and acrylic-lined cores are split using our GeoTek Core Splitter, which uses a band saw that vibrates and melts the lining, allowing a utility blade to cut the liner for a clean and precise cut. Cores that are split can be shrink-wrapped using the lab’s shrink-wrap machine for better preservation and long-term storage. Cores, either whole or split, are stored in our in-house core repository or in our larger location located in Moffit Field. GeoTek Rotating X-ray CT System (RXCT) and Multi Sensor Core Logger (MSCL-S) are utilized for any core imaging and line scanning needs.

The Core Splitting Lab also houses a sub-sampling station for core analysis using various tools. Sediment intervals for radiocarbon analysis can be analyzed with the lab’s microscope station. Also available are ovens for drying needs. Any request for lab use or sample submission should be address to the lab manager Jason Padgett (jpadgett@usgs.gov

The Core Splitting Lab is co-located alongside the Core Scanning Lab and the USGS Southwest Region Sample Repository.

 

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Scientists separating a sediment core split lengthwise
Splitting a sediment core.
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Scientists wrapping a split sediment core in plastic
Wrapping a split sediment core.
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Scientists splitting a sediment core with the GeoTek core splitter
Using the GeoTek core splitter.
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Scientist placing a sediment core in the rotating x-ray computed tomography system
Preparing to scan a sediment core in the GeoTek Rotating X-ray CT System (RXCT).
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Image of the GeoTek Multi-Sensor Core Logger scanning a core.
The multi sensor core logger (MSCL) can create a line-scan image of a split core like this one.

News

New Video Offers Virtual Tour of the USGS Sediment Core Lab

New Video Offers Virtual Tour of the USGS Sediment Core Lab

Searching for Evidence of Past Tsunamis in Sediment Cores

Searching for Evidence of Past Tsunamis in Sediment Cores

South Korean Geoscientists Visit the USGS in Menlo Park and Santa Cruz, California

South Korean Geoscientists Visit the USGS in Menlo Park and Santa Cruz, California

Publications

Marine paleoseismic evidence for seismic and aseismic slip along the Hayward-Rodgers Creek fault system in northern San Pablo Bay Marine paleoseismic evidence for seismic and aseismic slip along the Hayward-Rodgers Creek fault system in northern San Pablo Bay

Distinguishing between seismic and aseismic fault slip in the geologic record is difficult, yet fundamental to estimating the seismic potential of faults and the likelihood of multi-fault ruptures. We integrated chirp sub-bottom imaging with targeted cross-fault coring and core analyses of sedimentary proxy data to characterize vertical deformation and slip behavior within an extensional...
Authors
Janet Watt, Mary McGann, Renee K. Takesue, Thomas Lorenson

Late Holocene environmental change in Celestun Lagoon, Yucatan, Mexico Late Holocene environmental change in Celestun Lagoon, Yucatan, Mexico

Epikarst estuary response to hydroclimate change remains poorly understood, despite the well-studied link between climate and karst groundwater aquifers. The influence of sea-level rise and coastal geomorphic change on these estuaries obscures climate signals, thus requiring careful development of paleoenvironmental histories to interpret the paleoclimate archives. We used foraminifera...
Authors
Kyle Hardage, Joseph Street, Jorge A. Herrera-Silveira, Ferdinand K.J. Oberle, Adina Paytan

Plate boundary localization, slip-rates and rupture segmentation of the Queen Charlotte Fault based on submarine tectonic geomorphology Plate boundary localization, slip-rates and rupture segmentation of the Queen Charlotte Fault based on submarine tectonic geomorphology

Linking fault behavior over many earthquake cycles to individual earthquake behavior is a primary goal in tectonic geomorphology, particularly across an entire plate boundary. Here, we examine the 1150-km-long, right-lateral Queen Charlotte-Fairweather fault system using comprehensive multibeam bathymetry data acquired along the Queen Charlotte Fault (QCF) offshore southeastern Alaska...
Authors
Daniel S. Brothers, Nathaniel C. Miller, Vaughn Barrie, Peter J. Haeussler, H. Gary Greene, Brian D. Andrews, Olaf Zielke, Peter Dartnell

Science

Cascadia Subduction Zone Marine Geohazards

Societal Issue: Uncertainty related to rupture extent, slip distribution, and recurrence of past subduction megathrust earthquakes in the Pacific Northwest (northern CA, OR, WA, and southern BC) leads to ambiguity in earthquake and tsunami hazard assessments and hinders our ability to prepare for future events.
Cascadia Subduction Zone Marine Geohazards

Cascadia Subduction Zone Marine Geohazards

Societal Issue: Uncertainty related to rupture extent, slip distribution, and recurrence of past subduction megathrust earthquakes in the Pacific Northwest (northern CA, OR, WA, and southern BC) leads to ambiguity in earthquake and tsunami hazard assessments and hinders our ability to prepare for future events.
Learn More

Hazards: EXPRESS

Marine geohazards including earthquakes, landslides, and tsunamis lie offshore of densely populated areas of California, Oregon, and Washington. One goal of EXPRESS is to improve assessments of these hazards.
Hazards: EXPRESS

Hazards: EXPRESS

Marine geohazards including earthquakes, landslides, and tsunamis lie offshore of densely populated areas of California, Oregon, and Washington. One goal of EXPRESS is to improve assessments of these hazards.
Learn More
Tsunami Hazards, Modeling, and the Sedimentary Record

Tsunami Hazards, Modeling, and the Sedimentary Record

Basic research to develop the geologic record of paleotsunamis and improve the ability to interpret that record is needed to mitigate tsunami risk in the U.S.
Learn More
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