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USGS Tephrochronology (Tephra) Project

Project status is complete. Please check the project list for currently active projects

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Who are we?

Project Science Personnel

Wan, Elmira - Project Chief and Principal Research Scientist – Geology, and Tephrochronology Laboratory Manager (

Holly Olson - Physical Science Technician, Electron Microprobe Analyst, and Database Specialist (

Sarna-Wojcicki, Andrei M. - Research Associate (emeritus) (

Who are our primary stakeholders for the project?

PROJECT RESEARCH AND COLLABORATIONS: The Tephrochronology lab analyses samples for USGS projects supported by the National Cooperative Geologic Mapping Program (NCGMP), USGS Global Change Research Program, USGS Pacific Coastal & Marine Science Center, Volcanic Hazards Program (VHZ), and Earthquake Hazards Program (EHZ). USGS Projects served by the Tephrochronology lab include:

National Cooperative Geologic Mapping Program (NCGMP) Projects:

USGS Global Change Research Program (ESD):

  • Holocene Climate of the Pacific Margin Project:  (John Barron, Project Chief)

Task 1 High Resolution Holocene Marine Records – Santa Barbara Basin
Task 2: Pacific Estuaries and Lagoons - Palmyra Atoll
Task 3: Western Lake studies:
Subtask 1: Ruby Mountains, Nevada,
Subtask 2: Swamp Lake, Yosemite National Park
Subtask 3: east-central Sierra Nevada;
Subtask 4: Mono Craters/ Swamp Lake Geobiochronology
Subtask 5: Hobart Lake, Oregon

  • Tephrochronology of Big Soda Lake, Nevada (M. Rosen, (WRD), M. Reheis
USGS Pacific Coastal & Marine Science Center:

USGS Volcanic Hazards Program (VHZ)

  • Supervolcano Venture Capital Project
The Tephrochronology lab has collaborated with geologic surveys from California and Colorado, and the New Mexico Bureau of Geology and Mineral Resources.

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